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  • 1.
    Joffre, Thomas
    et al.
    Uppsala University, Sweden.
    Segerholm, Kristoffer
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.
    Persson, Cecilia
    Uppsala University, Sweden.
    Bardage, Stig
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.
    Luengo Hendriks, Cris L.
    Uppsala University, Sweden.
    Isaksson, Per
    Uppsala University, Sweden.
    Characterization of interfacial stress transfer ability in acetylation-treated wood fibre composites using X-ray microtomography2017Ingår i: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 95, s. 43-49Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The properties of the fibre/matrix interface contribute to stiffness, strength and fracture behaviour of fibre-reinforced composites. In cellulosic composites, the limited affinity between the hydrophilic fibres and the hydrophobic thermoplastic matrix remains a challenge, and the reinforcing capability of the fibres is hence not fully utilized. A direct characterisation of the stress transfer ability through pull-out tests on single fibres is extremely cumbersome due to the small dimension of the wood fibres. Here a novel approach is proposed: the length distribution of the fibres sticking out of the matrix at the fracture surface is approximated using X-ray microtomography and is used as an estimate of the adhesion between the fibres and the matrix. When a crack grows in the material, the fibres will either break or be pulled-out of the matrix depending on their adhesion to the matrix: good adhesion between the fibres and the matrix should result in more fibre breakage and less pull-out of the fibres than poor adhesion. The effect of acetylation on the adhesion between the wood fibres and the PLA matrix was evaluated at different moisture contents using the proposed method. By using an acetylation treatment of the fibres it was possible to improve the strength of the composite samples soaked in the water by more than 30%.

  • 2.
    Jones, Dennis
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Englund, Finn
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Henriksson, Marielle
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Trey, Stacy
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Ziethén, Rune
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Gonzales, Sergio
    Segui, Luis
    Development of a novel wood based panel for use in internal door manufacture2012Konferensbidrag (Refereegranskat)
  • 3.
    Kymäläinen, Maija
    et al.
    Aalto University, Finland.
    Hautamäki, Saara
    Aalto University, Finland.
    Lillqvist, Kristiina
    KTH Royal Institute of Technology, Sweden.
    Segerholm, Kristoffer
    RISE - Research Institutes of Sweden, Bioekonomi. KTH Royal Institute of Technology, Sweden.
    Rautkari, Lauri
    Aalto University, Finland.
    Surface modification of solid wood by charring2017Ingår i: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 52, nr 10, s. 6111-6119Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Most wooden structures for outdoor applications require repetitive maintenance operations to protect the surfaces from adverse effects of weathering. One-sided surface modification of boards with a relatively fast charring process has the potential to increase the durability and service life of wooden claddings. To assess some weathering-related effects on surface charred wood, spruce and pine sapwood were subjected to a series of long charring processes (30–120 min) at a moderate temperature of 250 °C and to a short one (30 s) at a high temperature of 400 °C. The wettability and contact angles of treated samples were investigated, and the heat transfer was measured along with the micromorphological changes taking place in the material. The result revealed an increased moisture resistance of charred spruce sapwood and an increased water uptake of pine sapwood. The contact angles of both wood species improved compared to references. Heat conduction measurement revealed that only a thin section of the wood was thermally modified. Some micromorphological changes were recorded, especially on the inside walls of the lumina. The results show that spruce sapwood has an improved resistance towards moisture-induced weathering, but more studies are needed to unlock the potential of surface charred wood.

  • 4. Källbom, Susanna
    et al.
    Ormondroyd, Graham
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Jones, Dennis
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Wålinder, Magnus
    Surface Energy Characteristics of Refined Fibres at Different Pressures2014Ingår i: Proceedings of 10th Meeting of the Northern European Network for Wood Science & Engineering (WSE 2014), Edinburgh Napier University , 2014, , s. 134-138Konferensbidrag (Refereegranskat)
  • 5.
    Källbom, Susanna
    et al.
    KTH Royal Institute of Technology, Sweden.
    Rautkari, Lauri
    Aalto University, Finland.
    Wålinder, Magnus
    KTH Royal Institute of Technology, Sweden.
    Johansson, Leena-Sisko
    Aalto University, Finland.
    Campbell, Joseph
    Aalto University, Finland.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad. KTH Royal Institute of Technology, Sweden.
    Jones, Dennis
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Laine, Kristiina
    KTH Royal Institute of Technology, Sweden.
    Water vapour sorption characteristics and surface chemical composition of thermally modified spruce2016Ingår i: International Wood Products Journal, ISSN 2042-6445, E-ISSN 2042-6453, Vol. 7, nr 3, s. 116-123Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The objective of this work was to study the hygroscopicity and surface chemical composition of thermally modified (TM) spruce. An effort was also made to study if those features were influenced by a previous exposure to a significant increase in relative humidity (RH). TM and unmodified Norway spruce (Picea abies Karst) samples, both in solid and ground form, were prepared. Water vapour sorption characteristics of the ground samples were obtained by measuring sorption isotherms using a dynamic vapour sorption (DVS). The surface chemical composition of the solid samples, both acetone extracted and non-extracted, were analysed using X-ray photoelectron spectroscopy (XPS). The DVS analysis indicated that the TM wood exposed to the 75% RH revealed a decrease in isotherm hysteresis. The XPS analysis indicated a decrease of acetone extractable or volatile organic components and a relative increase of non-extractable components for the samples exposed to the increased RH condition.

  • 6. Källbom, Susanna
    et al.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Jones, Dennis
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP - Sveriges Tekniska Forskningsinstitut, SP Trä.
    Surface energy characterization at different moisture levels of thermally modified wood using inverse gas chromatograph2013Ingår i: Proceedings of the 9th Meeting of the Northern European Network for Wood Science and Engineering, 2013, , s. 130-135Konferensbidrag (Övrigt vetenskapligt)
  • 7. Källbom, Susanna
    et al.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Jones, Dennis
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Surface energy characterization of thermally modified wood using inverse gas chromatography2013Ingår i: Proceedings IRG Annual Meeting IRG/WP 13, 2013, , s. 6Konferensbidrag (Övrigt vetenskapligt)
  • 8.
    Källbom, Susanna
    et al.
    KTH Royal Institute of Technology, Sweden.
    Wålinder, Magnus
    KTH Royal Institute of Technology, Sweden.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad. KTH Royal Institute of Technology, Sweden.
    Jones, Dennis
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Surface energy characterization of thermally modified spruce using inverse gas chromatography under cyclic humidity conditions2015Ingår i: Wood and Fiber Science, ISSN 0735-6161, Vol. 47, nr 4, s. 410-420Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The surface energy of unmodified and thermally modified spruce wood components was researched at dry and moist conditions using inverse gas chromatography. The results indicate a more pronounced heterogeneous nature of the thermally modified wood surfaces in terms of the dispersive (nonpolar) component of the surface energy, compared with that of the unmodified wood surfaces. The dispersive component of the surface energy of the thermally modified wood ranged between 44 and 38 mJ/m2 corresponding to an increase in surface coverage from a low level and up to about 10%. Suggested explanations for the more distinct heterogeneity of the thermally modified wood sample arerelated to chemical changes of the wood substance which seem to result in certain micromorphological features observed by scanning electron microscopy as alternated fracture surfaces created in the grinding process; and also possible changes or redistribution of the wood extractives. An increase of the MC, representing a change from a dry condition of approximately 0% RH to ca 75% RH, of both the unmodified and thermally modified samples seemed to have a marginal influence on the dispersive component of the surface energy. Possible implications of the results in this study can be found in the tailoring of new compatible and durable material combinations, for example, when using thermally modified wood residuals as a component in new types of biocomposites.

  • 9.
    Laine, Kristiina
    et al.
    KTH Royal Institute of Technology, Sweden.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut. KTH Royal Institute of Technology, Sweden.
    Wålinder, Magnus
    KTH Royal Institute of Technology, Sweden.
    Rautkari, Lauri
    Aalto University, Finland.
    Hughes, Mark
    Aalto University, Finland.
    Wood densification and thermal modification: hardness, set-recovery and micromorphology2016Ingår i: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 50, nr 5, s. 883-894Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The density of wood can be increased by compressing the porous structure under suitable moisture and temperature conditions. One aim of such densification is to improve surface hardness, and therefore, densified wood might be particularly suitable for flooring products. After compression, however, the deformed wood material is sensitive to moisture, and in this case, recovered up to 60 % of the deformation in water-soaking. This phenomenon, termed set-recovery, was reduced by thermally modifying the wood after densification. This study presents the influence of compression ratio (CR = 40, 50, 60 %) and thermal modification time (TM = 2, 4, 6 h) on the hardness and set-recovery of densified wood. Previously, set-recovery has mainly been studied separately from other properties of densified wood, while in this work, set-recovery was also studied in relation to hardness. The results show that set-recovery was almost eliminated with TM 6 h in the case of CR 40 and 50 %. Hardness significantly increased due to densification and even doubled compared to non-densified samples with a CR of 50 %. Set-recovery reduced the hardness of densified (non-TM) wood back to the original level. TM maintained the hardness of densified wood at an increased level after set-recovery. However, some reduction in hardness was recorded even if set-recovery was almost eliminated.

  • 10.
    Laine, Kristiina
    et al.
    KTH Royal Institute of Technology, Sweden.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut. KTH Royal Institute of Technology, Sweden.
    Wålinder, Magnus
    KTH Royal Institute of Technology, Sweden.
    Rautkari, Lauri
    Aalto University, Finland.
    Hughes, Mark
    Aalto University, Finland.
    Lankveld, Chiel
    Accsys Technologies, Netherlands.
    Surface densification of acetylated wood2016Ingår i: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 74, nr 6, s. 829-835Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The mechanical properties of wood can be improved by compressing its porous structure between heated metal plates. By adjusting the process parameters it is possible to target the densification only in the surface region of wood where the property improvements are mostly needed in applications, such as flooring. The compressed form is, however, sensitive to moisture and will recover to some extent in high humidity. In this study, therefore, acetylated radiata pine was utilised in the surface densification process in order to both reduce the set-recovery of densified wood and to improve the hardness of the acetylated wood. Pre-acetylation was found to significantly reduce the set-recovery of surface densified wood. However, after the second cycle the increase in set-recovery of acetylated wood was relatively higher than the un-acetylated wood. The acetylated samples were compressed by only 1 mm (instead of the target 2 mm), yet, the hardness and hardness recovery of the acetylated samples significantly increased as a result of densification. It was also discovered that rough (un-planed) surfaces may be surface densified, however, even if the surface became smooth to the touch, the appearance remained uneven.

  • 11. Laine, Kristiina
    et al.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Wålinder, Magnus
    Rautkari, Lauri
    Jones, Dennis
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Hughes, Mark
    The effect of process parameters on the micromorphology of surface densified wood2014Ingår i: The seventh European Conference on Wood Modification : Book of Abstracts, 2014Konferensbidrag (Refereegranskat)
  • 12.
    Laine, Kristiina
    et al.
    Aalto University, Finland.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Wålinder, Magnus
    KTH Royal Institute of Technology, Sweden.
    Rautkari, Lauri
    Aalto University, Finland.
    Ormondroyd, Graham
    Bangor University, UK.
    Hughes, Mark
    Aalto University, Finland.
    Jones, Dennis
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Micromorphological studies of surface densified wood2014Ingår i: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 49, nr 5, s. 2027-2034Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Scots pine (Pinus sylvestris L.) wood was surface densified in its radial direction in an open press with one heated plate to obtain a higher density on the wood surface whilst retaining the overall thickness of the sample. This study investigated the effect of temperature (100, 150 and 200 °C) and press closing speed (5, 10 and 30 mm/min, giving closing times of 60, 30 and 10 s, respectively) on the micromorphology of the cell-wall, as well as changes occurring during set-recovery of the densified wood. The micromorphology was analysed using scanning electron microscopy (SEM) combined with a sample preparation technique based on ultraviolet-excimer laser ablation. Furthermore, the density profiles of the samples were measured. Low press temperature (100 °C) and short closing time (10 s) resulted in more deformation through the whole thickness, whilst increasing the temperature (150 and 200 °C) and prolonging the closing time (30 and 60 s) enabled more targeted deformation closer to the heated plate. The deformation occurred in the earlywood regions as curling and twisting of the radial cell-walls, however, no apparent cell-wall disruption or internal fracture was observed, even at low temperatures and fast press closing speed, nor after soaking and drying of the samples. In the SEM-analysis after soaking and drying, it was noticed that the cells did not completely recover their original form. Thus, part of the deformation was considered permanent perhaps due to viscoelastic flow and plastic deformation of the cell-wall components.

  • 13.
    Larsson Brelid, Pia
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Alfredsen, G
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Wood plastic composites with improved dimensional stability and biological resistance2006Ingår i: ECOWOOD 2006. 2nd International Conference on Environmentally-Compatible Forest Products, Fernando Pessoa University , 2006, , s. 385-391Konferensbidrag (Övrigt vetenskapligt)
  • 14.
    Larsson Brelid, Pia
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Wood plastic composites from modified wood. Part 1: Conceptual idea, mechanical and Physical Properties2005Ingår i: International research group on wood protection. The 37th annual conference in Tromsø 18-22 June. IRG/WP 06-40353., 2005, , s. 13Konferensbidrag (Övrigt vetenskapligt)
  • 15.
    Olsson, Sara
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Östmark, Emma
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Ibach, R.E.
    Clemons, Craig M
    FS Forest Products Laboratory.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP - Sveriges Tekniska Forskningsinstitut, SP Trä.
    Englund, Finn
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP - Sveriges Tekniska Forskningsinstitut, SP Trä.
    The use of esterified lignin for synthesis of durable composites2011Ingår i: 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE), Norsk institutt for skog og landskap , 2011, , s. 173-178Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Lignin is a natural polymer and one of the most abundant materials on earth. Despite this fact, lignin is often viewed as a by-product in chemical pulp processing and the use of lignin as a sustainable material is low. However, research and public awareness of sustainability have opened up new possibilities for using lignin as a material. In this study, Kraft softwood lignin was reacted with acetic and propionic anhydride to synthesize esterified lignin. Reactions were performed at 80 °C. The product was analyzed using IR, DSC and processability parameters, such as melt viscosity. The product was then blended with LDPE and extruded into composite films. The films were analyzed using FTIR and TGA, and the mechanical properties were determined by tensile tests. Preliminary results are positive and further studies are planned to confirm the results and establish the range of properties attainable.

  • 16.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä. Architecture and the Built Environment, KTH Royal Institute of Technology.
    Characteristics of wood plastic composites based on modified wood: Moisture properties biological restistance and micromorphology2012Doktorsavhandling, monografi (Övrigt vetenskapligt)
  • 17.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä. School of Architecture and the Built Environment, Royal Institute of Technlogy.
    Wood plastic composites made from modified wood: aspects on moisture sorption, micromorphology and durability2007Licentiatavhandling, monografi (Övrigt vetenskapligt)
  • 18.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Ibach, R.E.
    Moisture and Fungal Durability of Wood-Plastic Composites Made With Chemically Modified and Treated Wood Flour2013Ingår i: Proceedings IRG Annual Meeting IRG/WP 13, 2013, , s. 8Konferensbidrag (Övrigt vetenskapligt)
  • 19.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Ibach, R.E.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Durability of PLA - Modified Wood Composites2011Ingår i: Proceedings of the 11th International Conference on Wood & Biofiber Plastic Composites, 2011Konferensbidrag (Övrigt vetenskapligt)
  • 20.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Ibach, R.E.
    Forest Products Laboratory, USA.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Moisture sorption, biological durability, and mechanical performance of WPC containing modified wood and polylactates2012Ingår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 7, nr 4, s. 4575-4585Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Biological durability is an important feature for wood-plastic composites (WPC) intended for outdoor applications. One route to achieving WPC products with increased biological durabilityis to use wood preservative agents in the formulation of the WPC. Another option could be to use a chemically modified wood component that already exhibits increased resistance to biologicaldegradation. There is also a need to use biobased thermoplastics made from renewable resources, which would decrease the dependency on petrochemically-produced thermoplastics in the future. The objective of this study was to examine moisture sorption properties, biological durability, and mechanical performance of injection-molded WPC samples based on acetylated or thermally modified wood components and a polylactate matrix. The biological durability was evaluated in a terrestrial microcosm (TMC) test according to ENV 807, followed by mechanical evaluation in a center point bending test. The moisture sorption properties were investigated via both water soaking and exposure in a high-humidity climate. Low or negligible mass losses were observed in the TMC test for all WPC samples. However, the mechanical evaluation after exposure in the TMC test showed 35-40% losses in both strength and stiffness for the WPC containing an unmodified wood component.

  • 21.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Ibach, R.E.
    Forest Products Laboratory, USA.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Moisture sorption in artificially aged wood-plastic composites2012Ingår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 7, nr 1, s. 1283-1293Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Moisture sorption in wood-plastic composites (WPCs) affects their durability and dimensional stability. In certain outdoor exposures, the moisture properties of WPCs are altered due to e.g. cracks induced by swelling and shrinkage of the components, as well as UV degradation or biological attack. The aim of this work was to study the effect of different artificial ageing routes on the moisture sorption properties of WPCs. Extruded WPCs were prepared with either unmodified or acetylated wood and recycled high-density polyethylene (HDPE). The WPC samples were artificially aged involving water soaking, artificial weathering, and white- or brown-rot decay in different combinations. After the ageing, the samples were conditioned in either 65% or 90% relative humidity (RH) until equilibrium moisture content was reached. A dynamic moisture sorption analyzer was used to monitor the sorption rate of samples subjected to a climate change from 65% to 90% RH. Scanning electron microscopy was used to study the surface morphology of the aged composites. Results showed that the artificial weathering caused cracking of the HDPE matrix at the compositesurface, as well as a wood-matrix debonding, resulting in an increased moisture sorption rate. The WPC samples subjected to white-rot decay showed the highest moisture sorption rate.

  • 22.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Rowell, Roger
    Chemically Modified Wood in Thermoplastic Composites2012Ingår i: International Seminar on Wood Plastic Composites, 2012, , s. 16Konferensbidrag (Refereegranskat)
  • 23.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Frisk, Olof
    Biological outdoor durability of WPC with chemically modified wood2012Ingår i: The Sixth European Conference on Wood Modification Proceedings., University of Ljubljana , 2012, , s. 47-54Konferensbidrag (Refereegranskat)
  • 24.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Omidvar, Asghar
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP - Sveriges Tekniska Forskningsinstitut, SP Trä.
    Acetylation to Minimize Water Uptake and Deformation of High Wood Content WPC2009Ingår i: Proceedings of The Fourth European Conference on Wood Modification., SP Technical Research Institute of Sweden , 2009, , s. 239-242Konferensbidrag (Övrigt vetenskapligt)
  • 25.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Rowell, Roger
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Alfredsen, G
    Improved durability and moisture sorption characteristics of extruded WPCs made from chemically modified wood2007Ingår i: Proceedings from the 9th International Conference on Wood & Biofiber Plastic Composite, Forest Products Society , 2007, , s. 251-256Konferensbidrag (Refereegranskat)
    Abstract [en]

    Today, wood-plastic composites (WPC) are mainly used in outdoor applications (e.g. as replacement for traditional preservative-treated wood). In such environments, moisture sorption combined with temperature induced movements of the polymer matrix may cause macroscopic dimensional changes and distortion (e.g. warping, cupping, and bowing of the composite boards as well as microscopic wood polymer interfacial cracks). Moisture uptake (diffusion/capillary penetration) in the composite also makes the wood component more susceptible for fungal growth and decay. Furthermore, the durability of the composite product may be further decreased by UV degradation effects. By using a modified wood component which is less hygroscopic, these problems could be minimized or entirely avoided. The objective of this work is to study the moisture sensitivity of WPCs made from modified wood and the effects of moisture sorption on the composites micromorphology, wood polymer interfacial behavior, and durability. The three modification methods used in this work are acetylation, furfurylation, and heat treatment. The technique used for studying the composite micromorphology was based on LV-SEM (low-vacuum scanning electron microscopy) combined with a specially designed specimen preparation technique by UV-laser ablation. Results show that wetting and drying of WPCs result in severe inner micro-cracks and interfacial debonding. These effects are, however, greatly reduced for WPCs made from the modified wood used in this study. In addition, the resistance to decay by fungi of such WPCs is significantly improved.

  • 26.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Rowell, Roger
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Söderström, Ove
    Micromorphology and durability of WPCs made from chemically modified wood2007Ingår i: Proceedings of the 3rd meeting of the Nordic-Baltic Network in Wood Material Science and Engineering (WSE), Helsinki University Print , 2007, , s. 57-63Konferensbidrag (Övrigt vetenskapligt)
  • 27.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Vellekoop, Stefan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Process-Related Mechanical Degradation of the Wood Component in High-Wood-Content Wood-Plastic Composites2012Ingår i: Wood and Fiber Science, ISSN 0735-6161, Vol. 44, nr 2, s. 145-154Artikel i tidskrift (Refereegranskat)
  • 28.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Walkenström, Pernilla
    Nyström, Birgitha
    RISE., Swerea, SICOMP.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Micromorphology, moisture sorption and mechanical properties of a biocomposite based on acetylated wood particles and cellulose ester2007Ingår i: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 2, nr 3-4, s. 106-117Artikel i tidskrift (Refereegranskat)
  • 29.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wood plastic composites from modified wood and CAP2011Ingår i: Proceedings: 4th Wood Fibre Polymer Composites International Symposium, FCBA Institut Technologique , 2011Konferensbidrag (Övrigt vetenskapligt)
  • 30.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Dimensional Changes due to Water Sorption in High Wood-Content WPCs Prepared with Modified Wood2010Ingår i: Proceedings of The Fifth European Conference on Wood Modification ECWM5, Latvian State Institute of Wood Chemistry , 2010, , s. 201-204Konferensbidrag (Refereegranskat)
  • 31.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Inverse gas chromatography characterization of wood composite components2012Ingår i: Proceedings of the 8th meeting of the Northern European Network for Wood Science and Engineering (WSE), Kaunas University of Technology , 2012, , s. 58-63Konferensbidrag (Övrigt vetenskapligt)
  • 32.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Bardage, Stig
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Mould growth resistance of fungicide-containing WPC2011Ingår i: Proceedings of the 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE), Norsk institutt for skog og landskap , 2011, , s. 25-30Konferensbidrag (Övrigt vetenskapligt)
  • 33.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Holmberg, Daniel
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Adhesion studies of scots pine-polypropylene bond using ABES2010Ingår i: Proceedings of 6th meeting of the Nordic-Baltic Network in Wood Material Science and Engineering (WSE), Tallinn University of Technology , 2010, , s. 142-146Konferensbidrag (Övrigt vetenskapligt)
  • 34.
    Segerholm, Kristoffer
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Wålinder, Magnus
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Walkenström, P
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP - Sveriges Tekniska Forskningsinstitut, SP Trä.
    Wood plastic composites made from acetylated wood - Effects on water vapour sorption behaviour and durability2005Ingår i: Proceedings of the 2005 European Panel Products Symposium, Llandudno, UK, BioComposites Centre , 2005, , s. 233-242Konferensbidrag (Övrigt vetenskapligt)
  • 35.
    Westin, Mats
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Van den Oever, M
    Wood Plastic Composites from modified wood. Part 3: Durability of WPCs with bioderived matrix2008Ingår i: Proceedings of IRG Annual Meeting, 2008, , s. 17Konferensbidrag (Övrigt vetenskapligt)
  • 36.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Long, Carl
    Dickerson, James
    Wettability of acetylated Southern yellow pine2013Ingår i: International Wood Products Journal, ISSN 2042-6445, E-ISSN 2042-6453, Vol. 4, nr 3, s. 197-203Artikel i tidskrift (Refereegranskat)
  • 37.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Long, Carl
    Dickerson, James
    Wetting characteristics and coatings penetrability in acetylated Southern yellow pine2012Ingår i: The Sixth European Conference on Wood Modification Proceedings, University of Ljubljana , 2012, , s. 39-46Konferensbidrag (Refereegranskat)
  • 38.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Omidvar, Asghar
    Seltman, Joachim
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Micromorphological studies of modified wood using a surface preparation technique based on ultraviolet laser ablation2009Ingår i: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 4, nr 1-2, s. 46-51Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The objective of this paper is to demonstrate an ultraviolet (UV) laser ablation technique as a tool for sample preparation in microscopy studies of modified wood. Improved techniques for studying the microstructure of modified wood are crucial for a deeper understanding of many of their physical, mechanical and durability properties. The surface preparation technique is described in this paper. An illustration of micrographs of the micromorphology and polymer distribution in some examples of modified wood is also presented. It is clearly demonstrated that in contrast to conventional surface preparation techniques used for light microscopy and scanning electron microscopy, i.e. razor blade and microtome cutting techniques, UV laser ablation does not introduce any mechanically induced microcracks and redistribution of polymers or other mobile substances in the prepared surface. Results also show that, in particular, this technique seems to be suitable for studying polymer distribution in resin-impregnated wood, as well as detection of microcracks in modified wood cell walls.

  • 39.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Omidvar, Asghar
    Seltman, Joachim
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Micromorphology Studies of Modified Wood Using a Surface Preparation Technique Based on UV-Laser Ablation2009Ingår i: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 4, nr 1-2, s. 46-51Artikel i tidskrift (Refereegranskat)
  • 40.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Omidvar, Asghar
    Seltman, Joachim
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP - Sveriges Tekniska Forskningsinstitut, SP Trä.
    Micromorphology Studies of Modified Wood Using a Surface Preparation Technique Based on UV-Laser Ablation2009Ingår i: 4th European Conference on Wood Modification),. Stockholm. 2009-04-27--29, SP Technical Research Institute of Sweden. SP-Trätek , 2009, , s. 103-110Konferensbidrag (Övrigt vetenskapligt)
  • 41.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Larsson Brelid, Pia
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Liquids and Coatings Wettability and Penetrability of Acetylated Scots Pine Sapwood2010Ingår i: Proceedings of The Fifth European Conference on Wood Modification ECWM5, Latvian State Institute of Wood Chemistry , 2010, , s. 381-388Konferensbidrag (Refereegranskat)
  • 42.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Söderström, Ove
    Water sorption properties and dimensional changes of high wood-content WPC2011Ingår i: Proceedings of the 7th meeting of the Nordic-Baltic Network in Wood Material Science & Engineering (WSE), Forest & Landscape Denmark, University of Copenhag , 2011, , s. 153-160Konferensbidrag (Övrigt vetenskapligt)
  • 43.
    Wålinder, Magnus
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Segerholm, Kristoffer
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Westin, Mats
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Durability of high wood content WPCs2010Ingår i: Proceeings of International Convention of Society of Wood Science and Technology and United Nations Economic Commission for Europe – Timber Committee, Society of Wood Science and Technology , 2010, , s. 10Konferensbidrag (Övrigt vetenskapligt)
1 - 43 av 43
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