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  • 1. Acciaro, R.
    et al.
    Aulin, C.
    RISE, Innventia.
    Wågberg, L.
    Lindström, T.
    RISE, Innventia.
    Claesson, P.M.
    Varga, I.
    Investigation of the formation structure and release characteristics of self-assembled composite films of cellulose nanofibrils and temperature responsive microgels2011In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, no 4, p. 1369-1377Article in journal (Refereed)
  • 2.
    Almgren, K. M.
    et al.
    RISE, STFI-Packforsk.
    Kerholm, M.
    RISE, STFI-Packforsk.
    Gamstedt, E. K.
    RISE, STFI-Packforsk.
    Salmen, Lennart
    RISE, STFI-Packforsk.
    Lindström, Mikael
    RISE, STFI-Packforsk.
    Effects of moisture on dynamic mechanical properties of wood fiber composites studied by dynamic FT-IR spectroscopy2008In: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 27, no 16-17, p. 1709-1721Article in journal (Refereed)
    Abstract [en]

    Wood fiber reinforced polylactide is a biodegradable composite where both fibers and matrix are from renewable resources. In the development of such new materials, information on mechanical behavior on the macroscopic and the molecular level is useful. In this study, dynamic Fourier transform infrared (FT-IR) spectroscopy is used to measure losses at the molecular level during cyclic tensile loading for bonds that are characteristic of the cellulosic fibers and the polylactid matrix. This molecular behavior is compared with measured macroscopic hysteresis losses for different moisture levels. The results show that moisture ingress will transfer the load from the fibers to the matrix, and that a more efficient fiber-matrix interface would diminish mechanical losses. Although the dynamic FT-IR spectroscopy method is still qualitative, this investigation shows that it can provide information on the stress transfer of the constituents in wood fiber reinforced plastics.

  • 3.
    Almgren, Karin M.
    et al.
    RISE, STFI-Packforsk.
    Gamstedt, E. Kristofer
    RISE, STFI-Packforsk.
    Berthold, Fredrik
    RISE, STFI-Packforsk.
    Lindström, Mikael
    RISE, STFI-Packforsk.
    Moisture uptake and hygroexpansion of wood fiber composite materials with polylactide and polypropylene matrix materials2009In: Polymer Composites, ISSN 0272-8397, E-ISSN 1548-0569, Vol. 30, no 12, p. 1809-1816Article in journal (Refereed)
    Abstract [en]

    Effects of butantetracarboxylic acid (BTCA) modification, choice of matrix, and fiber volume fraction on hygroexpansion of wood fiber composites have been investigated. Untreated reference wood fibers and BTCA-modified fibers were used as reinforcement in composites with matrices composed of polylactic acid (PLA), polypropylene (PP), or a mixture thereof. The crosslinking BTCA modification reduced the out-of- plane hygroexpansion of PLA and PLA/PP composites, under water-immersed and humid conditions, whereas the swelling increased when PP was used as matrix material. This is explained by difficulties for the BTCA- modified fibers to adhere to the PP matrix. Fiber volume fraction was the most important parameter as regards out-of-plane hygroexpansion, with a high-fiber fraction leading to large hygroexpansion. Fiber-matrix wettability during processing and consolidation also showed to have a large impact on the dimensional stability and moisture uptake.

  • 4.
    Almgren, Karin M.
    et al.
    RISE, STFI-Packforsk.
    Gamstedt, E. Kristofer
    RISE, STFI-Packforsk.
    Nygård, P.
    Malmberg, F.
    Lindblad, J.
    Lindström, Mikael
    RISE, STFI-Packforsk.
    Role of fibre-fibre and fibre-matrix adhesion in stress transfer in composites made from resin-impregnated paper sheets2009In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 29, no 5, p. 551-557Article in journal (Refereed)
    Abstract [en]

    Paper-reinforced plastics are gaining increased interest as packaging materials, where mechanical properties are of great importance. Strength and stress transfer in paper sheets are controlled by fibre-fibre bonds. In paper-reinforced plastics, where the sheet is impregnated with a polymer resin, other stress-transfer mechanisms may be more important. The influence of fibre-fibre bonds on the strength of paper-reinforced plastics was therefore investigated. Paper sheets with different degrees of fibre-fibre bonding were manufactured and used as reinforcement in a polymeric matrix. Image analysis tools were used to verify that the difference in the degree of fibre-fibre bonding had been preserved in the composite materials. Strength and stiffness of the composites were experimentally determined and showed no correlation to the degree of fibre-fibre bonding, in contrast to the behaviour of unimpregnated paper sheets. The degree of fibre-fibre bonding is therefore believed to have little importance in this type of material, where stress is mainly transferred through the fibre-matrix interface.

  • 5.
    Almgren, K.M.
    et al.
    RISE, Innventia.
    Gamstedt, E.K.
    RISE, Innventia.
    Characterization of interfacial stress transfer ability by dynamic mechanical analysis of cellulose fiber based composite materials2010In: Composite interfaces (Print), ISSN 0927-6440, E-ISSN 1568-5543, Vol. 17, no 9, p. 845-861Article in journal (Refereed)
    Abstract [en]

    The stress transfer ability at the fiber-matrix interface of wood fiber composites is known to affect the mechanical properties of the composite. The evaluation of interface properties at the level of individual fibers is however difficult due to the small dimensions and variability of the fibers. The dynamical mechanical properties of composite and constituents, in this case wood fibers and polylactide matrix, was here used together with micromechanical modeling to quantify the stress transfer efficiency at the fiber-matrix interface. To illustrate the methodology, a parameter quantifying the degree of imperfection at the interface was identified by inverse modeling using a micromechanical viscoelastic general self-consistent model with an imperfect interface together with laminate analogy on the composite level. The effect of moisture was assessed by comparison with experimental data from dynamic mechanical analysis in dry and moist state. For the wood fiber reinforced polylactide, the model shows that moisture absorption led to softening and mechanical dissipation in the hydrophilic wood fibers and biothermoplastic matrix, rather than loss of interfacial stress transfer ability.

  • 6. Ansari, F.
    et al.
    Sjöstedt, A.
    Larsson, Per Tomas
    RISE, Innventia.
    Berglund, L. A.
    Wågberg, L.
    Hierarchical wood cellulose fiber/epoxy biocomposites: Materials design of fiber porosity and nanostructure2015In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 74, p. 60-68Article in journal (Refereed)
    Abstract [en]

    Delignified chemical wood pulp fibers can be designed to have a controlled structure of cellulose fibril aggregates to serve as porous templates in biocomposites with unique properties. The potential of these fibers as reinforcement for an epoxy matrix (EP) was investigated in this work. Networks of porous wood fibers were impregnated with monomeric epoxy and cured. Microscopy images from ultramicrotomed cross sections and tensile fractured surfaces were used to study the distribution of matrix inside and around the fibers - at two different length scales. Mechanical characterization at different relative humidity showed much improved mechanical properties of biocomposites based on epoxy-impregnated fibers and they were rather insensitive to surrounding humidity. Furthermore, the mechanical properties of cellulose-fiber biocomposites were compared with those of cellulose-nanofibril (CNF) composites; strong similarities were found between the two materials. The reasons for this, some limitations and the role of specific surface area of the fiber are discussed.

  • 7.
    Aulin, C.
    et al.
    RISE, Innventia.
    Salazar-Alvarez, G.
    Lindström, T.
    RISE, Innventia.
    High strength flexible and transparent nanofibrillated cellulose-nanoclay biohybrid films with tunable oxygen and water vapor permeability2012In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, no 20, p. 6622-6628Article in journal (Refereed)
  • 8.
    Berglin, Niklas
    et al.
    RISE, Innventia.
    von Schenck, Anna
    RISE, Innventia.
    Alriksson, B
    Hornberg, A
    Lindstedt, J
    Östman, J
    POLYNOL - chemical intermediates from renewable sources2014Conference paper (Refereed)
  • 9. Butchosa, N.
    et al.
    Brown, C.
    Larsson, P.T.
    RISE, Innventia.
    Berglund, L.A.
    Bulone, V.
    Zhou, Q.
    Nanocomposites of bacterial cellulose nanofibers and chitin nanocrystals: Fabrication, characterization and bacterial activity2013In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270, no 12, p. 3404-3413Article in journal (Refereed)
  • 10. Chen, F.
    et al.
    Monnier, X.
    Gällstedt, M.
    Gedde, U.W.
    Hedenqvist, M.S.
    Wheat gluten/chitosan blends: A new biobased material2014In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 60, p. 186-197Article in journal (Refereed)
  • 11.
    Chinga-Carrasco, Gary
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Averianova, N.
    Gibadullin, M.
    Petrov, V.
    Leirset, Ingebjörg
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Micro-structural characterisation of homogeneous and layered MFC nano-composites2013In: Micron, ISSN 0968-4328, E-ISSN 1878-4291, Vol. 44Article in journal (Refereed)
  • 12.
    Chinga-Carrasco, Gary
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Brodin, Malin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Karlsen, Trond
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Wood pulp fibres and nanocellulose: Characterization and application in biocomposite materials2014Conference paper (Refereed)
    Abstract [en]

    A composite can be defined as a material composed of two or more components having distinct morphology and chemistry, and giving synergetic effects. In this paper the term biocomposite is used, referring to i) a material having at least one bio-component (e.g. wood pulp fibres and nanofibrils) or ii) biomaterials intended for biomedical applications. The utilization of wood pulp fibres in composite materials has gained major interest during the last years. There are various wood pulp fibres that can be used as reinforcement in composites, e.g. thermo-mechanical pulp (TMP), chemi-thermo-mechanical pulp (CTMP) and kraft pulp fibres. Depending on the pulping process (TMP, CTMP or kraft pulp), the pulp fibres differ greatly with respect to the fibre morphology and chemistry. Kraft pulp fibres have been one of the most used raw materials for producing nanocellulose. Nanocellulose from wood refers to various cellulose nano-materials such as cellulose nanocrystals and nanofibrillated cellulose. Nanofibrillated cellulose is composed of a major fraction of structurally homogeneous nanofibrils having typical widths in the nanometre scale and lengths in the micrometre scale. Wood pulp fibres and nanofibrils have been proposed as reinforcement in composite materials. Some of the major motivations have been the potential improvements by using fibres and nanofibrillated materials with respect to e.g. strength, biodegradability and functionality. The purpose of the present work is to review some advances in biocomposite research and development, including three focus areas; structured biocomposites, flexible biocomposites and biomaterials.

  • 13.
    Chinga-Carrasco, Gary
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Miettinen, A
    Hendriks, C.L.L
    Gamstedt, K
    Kataka, M
    Structural characterisation of kraft pulp fibres and their nanofibrillated materials for biodegradable composite applications2011In: Nanocomposites and Polymers with Analytical Methods, InTech , 2011Chapter in book (Refereed)
  • 14.
    Chinga-Carrasco, Gary
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Solheim, O.
    Lenes, M.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Larsen, Å.
    A method for estimating the fibre length in fibre-PLA composites2013In: Journal of Microscopy, ISSN 0022-2720, E-ISSN 1365-2818, Vol. 250Article in journal (Refereed)
  • 15.
    Chniga-Carrasco, Gary
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Miettinen, Arttu
    Luengo Hendriks, Cris L.
    Gamstedt, Kristofer E.
    Kataja, Markku
    Structural characterisation of kraft pulp fibres and their nanofibrillated materials for biodegradable composite applications2011In: Nanocomposites and polymers with analytical methods / [ed] Cuppoletti John, InTech, 2011Chapter in book (Refereed)
  • 16. Cho, S.-W.
    et al.
    Gällstedt, M.
    RISE, Innventia.
    Johansson, E.
    Hedenqvist, M.S.
    Injection-molded nanocomposites and materials based on wheat gluten2011In: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, no 1, p. 146-152Article in journal (Refereed)
  • 17. Cho, S.-W.
    et al.
    Gällstedt, Mikael
    RISE, Innventia.
    Hedenqvist, M.S.
    RISE, Innventia.
    Properties of wheat gluten/poly(lactic acid) laminates2010In: Journal of Agricultural and Food Chemistry, ISSN 0021-8561, E-ISSN 1520-5118, Vol. 58, no 12, p. 7344-7350Article in journal (Refereed)
    Abstract [en]

    Laminates of compression-molded glycerol-plasticized wheat gluten (WG) films surrounded and supported by poly(lactic acid) (PLA) films have been produced and characterized. The objective was to obtain a fully renewable high gas barrier film with sufficient mechanical integrity to function in, for example, extrusion-coating paper/board applications. It was shown that the lamination made it possible to make films with a broad range of glycerol contents (0-30 wt %) with greater strength than single unsupported WG films. The low plasticizer contents yielded laminates with very good oxygen barrier properties. In addition, whereas the unsupported WG films had an immeasurably high water vapor transmission rate (WVTR), the laminate showed values that were finite and surprisingly, in several cases, also lower than that of PLA. Besides being a mechanical support (as evidenced by bending and tensile data) and a shield between the WG and surrounding moisture, the PLA layer also prevented the loss of the glycerol plasticizer from the WG layer. This was observed after the laminate had been aged on an "absorbing" blotting paper for up to 17 weeks. The interlayer adhesion (peel strength) decreased with decreasing glycerol content and increasing WG film molding temperature (130 °C instead of 110 °C). The latter effect was probably due to a higher protein aggregation, as revealed by infrared spectroscopy. The lamination temperature (110-140 °C) did not, however, have a major effect on the final peel strength.

  • 18. Cunha, A.G.
    et al.
    Zhou, Q.
    Larsson, P.T.
    RISE, Innventia.
    Berglund, L.A.
    Topochemical acetylation of cellulose nanopaper structures for biocomposites: Mechanisms for reduced water vapour sorption2014In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 21, no 4, p. 2773-2787Article in journal (Refereed)
  • 19.
    Dahlman, Olof
    et al.
    RISE, Innventia.
    Larsson, Karolina
    RISE, Innventia.
    Thermoplastic wood hemicellulose-lactide graft-polymers and films2014Conference paper (Refereed)
  • 20.
    Dahlman, Olof
    et al.
    RISE, Innventia.
    Larsson, Karolina
    RISE, Innventia.
    Thermoplastic wood hemicellulose-lactide graft-polymers and films2014Conference paper (Refereed)
  • 21. Eita, M.
    et al.
    Arwin, H.
    Granberg, Hjalmar
    RISE, Innventia.
    Wågberg, L.
    Addition of silica nanoparticles to tailor the mechanical properties of nanofibrillated cellulose thin films2011In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, no 2, p. 566-572Article in journal (Refereed)
  • 22.
    Fall, Andreas
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Nanocellulose and graphene: promising hybrid materials2018In: Recent advances in cellulose nanotechnology research: production, characterization and applications, Trondheim: RISE PFI , 2018Conference paper (Refereed)
  • 23. Fernandes, S.C.M.
    et al.
    Freire, C.S.R.
    Silvestre, A.J.D.
    Pascoal Neto, C.
    Gandini, A.
    Berglund, Lars A.
    Salmen, Lennart
    RISE, Innventia.
    Transparent chitosan films reinforced with a high content of nanofibrillated cellulose2010In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 81, no 2, p. 394-401Article in journal (Refereed)
    Abstract [en]

    This paper reports the preparation and characterization of nanocomposite films based on different chitosan matrices and nanofibrillated cellulose (NFC) for the purpose of improving strength properties. The nanocomposite films were prepared by a simple procedure of casting a water-based suspension of chitosan and NFC, and were characterized by several techniques: namely SEM, X-ray diffraction, visible spectrophotometry, TGA, tensile and dynamic-mechanical analysis. The films obtained were shown to be highly transparent (transmittance varying between 90 and 20% depending on the type of chitosan and NFC content), flexible, displayed better mechanical properties, with a maximum increment on the Young’s modulus of 78% and 150% for high molecular weight (HCH) and water-soluble high molecular weight (WSHCH) filled chitosans, respectively; and of 200% and 320% for low molecular weight (LCH) and water-soluble filled (WSLCH) chitosans, respectively. The filled films also showed increased thermal stability, with, for example, an increase in the initial degradation temperature (Tdi) from 227 °C in the unfilled LCH film up to 271 °C in filled LCHNFC50% nanocomposite films, and a maximum degradation temperature (Td1) raising from 304 °C to 313 °C for the same materials.

  • 24. Fernández, A.
    et al.
    Sánchez, M. D.
    Ankerfors, Mikael
    RISE, STFI-Packforsk.
    Lagaron, J. M.
    Effects of ionizing radiation in ethylene-vinyl alcohol copolymers and in composites containing microfibrillated cellulose2008In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 109, no 1, p. 126-134Article in journal (Refereed)
    Abstract [en]

    This study reports on the effect of gamma radiation on morphological, thermal, and water barrier properties of pure ethylene vinyl alcohol copolymers (EVOH29 and EVOH44) and its biocomposites with the nanofiller microfibrillated cellulose (2 wt%). Added microfibrillated cellulose (MFC) preserved the transparency of EVOH films but led to a decrease in water barrier properties. Gamma irradiation at low (30 kGy) and high doses (60 kGy) caused some irreversible changes in the phase morphology of EVOH29 and EVOH44 copolymers that could be associated to crosslinking and other chemical alterations. Additionally, the EVOH copolymers and the EVOH composites reduced the number of hygroscopic hydroxyl functionalities during the irradiation processing and novel carbonyl based chemistry was, in turn, detected. As a result of the above alterations, the water barrier properties of both neat materials and composites irradiated at low doses were notably enhanced, counteracting the detrimental effect on water barrier of adding MFC to the EVOH matrix. © 2008 Wiley Periodicals, Inc.

  • 25.
    Flansbjer, Mathias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Honfi, Daniel
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Vennetti, Daniel
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Williams Portal, Natalie
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Mueller, Urs
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Własak, Lech
    Structural Concept of Novel RPC Sandwich Façade Elements with GFRP Connectors2016In: IABSE Congress Stockholm, 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Report, IABSE c/o ETH Hönggerberg , 2016, p. 2172-2186Conference paper (Refereed)
    Abstract [en]

    The SESBE research project aims to develop novel smart sandwich façade elements with high insulating capabilities while providing a reduced thickness in conjunction with superior mechanical and durability properties. The present paper mainly focuses on the verification of the mechanical performance of the glass fibre reinforced polymer (GFRP) connectors in the façade element composed of reactive powder concrete (RPC) panels with foam concrete insulation between them. Because of the reduced thickness of the large façade elements, the performance of the connectors is critical for the entire structural concept. A description of structural performance and results based on experimental methods and finite element (FE) analysis are presented.

  • 26. Gamstedt, E.K.
    et al.
    Sandell, R.
    Berthold, F.
    RISE, Innventia.
    Pettersson, T.
    RISE, Innventia.
    Nordgren, N.
    Characterization of interfacial stress transfer ability of particulate cellulose composite materials2011In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, no 11, p. 693-704Article in journal (Refereed)
  • 27. Ghanadpour, M.
    et al.
    Carosio, F.
    Larsson, Per Tomas
    RISE, Innventia.
    Wågberg, L.
    Phosphorylated Cellulose Nanofibrils: A Renewable Nanomaterial for the Preparation of Intrinsically Flame-Retardant Materials2015In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 16, no 10, p. 3399-3410Article in journal (Refereed)
    Abstract [en]

    Cellulose from wood fibers can be modified for use in flame-retardant composites as an alternative to halogen-based compounds. For this purpose, sulfite dissolving pulp fibers have been chemically modified by phosphorylation, and the resulting material has been used to prepare cellulose nanofibrils (CNF) that have a width of approximately 3 nm. The phosphorylation was achieved using (NH4)2HPO4 in the presence of urea, and the degree of substitution by phosphorus was determined by X-ray photoelectron spectroscopy, conductometric titration, and nuclear magnetic resonance spectroscopy. The presence of phosphate groups in the structure of CNF has been found to noticeably improve the flame retardancy of this material. The nanopaper sheets prepared from phosphorylated CNF showed self-extinguishing properties after consecutive applications of a methane flame for 3 s and did not ignite under a heat flux of 35 kW/m2, as shown by flammability and cone calorimetry measurements, respectively.

  • 28.
    Halonen, H.
    et al.
    RISE, Innventia.
    Larsson, P.T.
    RISE, Innventia.
    Iversen, T.
    RISE, Innventia.
    Mercerized cellulose biocomposites: A study of influence of mercerization on cellulose supramolecular structure, water retention value and tensile properties2013In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, no 1, p. 57-65Article in journal (Refereed)
  • 29. Hartzen, A.-S.M.
    et al.
    Lindberg, Siv M
    RISE, Innventia.
    The material expression of new pulp-fibre reinforced composites in relation to other material categories2016In: Proceedings - D and E 2016: 10th International Conference on Design and Emotion - Celebration and Contemplation, 2016, p. 191-200Conference paper (Refereed)
    Abstract [en]

    To help bridge the gap between the science lab and commercial production there is a need for a better understanding of how new bio-based materials are perceived by users. The aim of the studies in this paper was to identify the material expression, sensorial properties and semantic dimensions of a group of pulp-fibre reinforced composites that are still in the research phase and how these relate to other, better-known materials already on the market. The studies involved 21 different materials, divided into different material groups such as metals, solid woods, wood fibre materials, plastic and fibre-reinforced composites in which the pulp-fibre reinforced composites were included. The materials were evaluated for meaning in a product semantic study and for sensory perception in a sensorial study. The results of the semantic study gave two underlining dimensions explaining most of the variations between the materials, Quality and Naturalness. These dimensions also had strong correlations to some of the sensorial properties. The results indicate that the pulp-fibre reinforced composites were not perceived as having high quality or expressing naturalness. They were hard to distinguish from the plastics in the study. The implications for further research and material development are discussed.

  • 30.
    Jansson, Mikael
    et al.
    RISE, Innventia.
    Danielsson, Sverker
    RISE, Innventia.
    Edlund, U
    Albertsson, A-C
    Turnwood: barrier materials for packaging from wood hydrolysate2014Conference paper (Refereed)
  • 31. Jin, H.
    et al.
    Cao, A.
    Shi, E.
    Seitsonen, J.
    Zhang, L.
    Ras, R.H.A.
    Berglund, L.A.
    Ankerfors, M.
    RISE, Innventia.
    Walther, A.
    Ikkala, O.
    Ionically interacting nanoclay and nanofibrillated cellulose lead to tough bulk nanocomposites in compression by forced self-assembly2013In: Journal of materials chemistry. B, ISSN 2050-750X, E-ISSN 2050-7518, no 6, p. 835-840Article in journal (Refereed)
  • 32. Johnson, O.
    et al.
    Lindberg, Siv M
    RISE, STFI-Packforsk.
    Roos, A.
    Hugosson, M.
    Lindström, Mikael
    RISE, STFI-Packforsk.
    Consumer perceptions and preferences on solid wood, wood-based panels, and composites: A repertory grid study2008In: Wood and Fiber Science, ISSN 0735-6161, Vol. 40, no 4, p. 663-678Article in journal (Refereed)
    Abstract [en]

    Knowledge about consumer perception and preferences on solid wood, wood-based panels, and wood-based composites is important for product development and marketing. The aim of this study was to identify attributes and associations that people use to describe different types of wood materials and to explore how they relate to preferences. The study involved nine samples that were evaluated with the Kelly’s repertory grid technique and content analysis. Based on respondents’ answers, 19 core categories reflecting sample attributes were extracted. General preferences for each sample were also recorded. Principal component analysis generated two factors describing 1) naturalness, wood-likeness, softness, unprocessed origin, living, pleasant, and high value; and 2) solid and homogeneous impression. A third, preliminary factor included categories describing irregular pattern, sleekness, and smoothness. The wood samples were most liked, whereas composites and panels were not appreciated. Preferred core categories were naturalness, wood-likeness, smoothness, living impression, and value. The least liked core categories were processed, hard, and high weight. The implications of the results for product development and marketing are discussed. © 2008 by the Society of Wood Science and Technology.

  • 33. Josefsson, G.
    et al.
    Berthold, F.
    RISE, Innventia.
    Gamstedt, E.K.
    Stiffness contribution of cellulose nanofibrils to composite materials2014In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 51, no 5, p. 945-953Article in journal (Refereed)
  • 34.
    Karpenja, Tatjana
    et al.
    RISE, Innventia.
    Lorentzon, Ann
    RISE, Innventia.
    Wickholm, Kristina
    RISE, Innventia.
    Sustainability aspects in waste management of biocomposites2013Conference paper (Refereed)
  • 35. Klemm, D.
    et al.
    Kramer, F.
    Moritz, S.
    Lindström, T.
    RISE, Innventia.
    Ankerfors, M.
    RISE, Innventia.
    Gray, D.
    Dorris, A.
    Nanocelluloses: A new family of nature-based materials2011In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, no 24, p. 5438-5466Article in journal (Refereed)
  • 36. Kuktaite, R.
    et al.
    Plivelic, T.S.
    Cerenius, Y.
    Hedenqvist, M.S.
    Gällstedt, M.
    RISE, Innventia.
    Marttila, S.
    Ignell, R.
    Popineau, Y.
    Tranquet, O.
    Shewry, P.R.
    Johansson, E.
    Structure and morphology of wheat gluten films: From polymeric protein aggregates toward superstructure arrangements2011In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, no 5, p. 1438-1448Article in journal (Refereed)
  • 37. Kuktaite, R.
    et al.
    Ture, H.
    Hedenqvist, M.S.
    Gällstedt, M.
    RISE, Innventia.
    Plivelic, T.S.
    Gluten biopolymer and nanoclay-derived structures in wheat gluten-urea-clay composites2014In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 2, no 6, p. 1439-1445Article in journal (Refereed)
  • 38.
    Larsson, K.
    et al.
    RISE, Innventia.
    Berglund, L.A.
    Ankerfors, M.
    RISE, Innventia.
    Lindström, T.
    RISE, Innventia.
    Polylactide latex/nanofibrillated cellulose bionanocomposites of high nanofibrillated cellulose content and nanopaper network structure prepared by a papermaking route2012In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, no 3, p. 2460-2466Article in journal (Refereed)
  • 39.
    Lenes, M
    et al.
    Paper and Fibre Research Institute, NO - 7491 Trondheim, Norway.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Gregersen, Ø
    Performance Properties and Micro-structural quantification of fibre-polypropylene composites2011In: Materials Science and Technologies, Fiber Reinforced Composites, West Wirginia University , 2011Chapter in book (Refereed)
  • 40.
    Lenes, Marianne
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Gregersen, Öjvind
    Performance properties and micro-structural quantification of cellulose fibre-polypropylene composites2012In: Fiber-reinforced composites / [ed] Cheng Q, Nova Science Publishers, Inc., 2012, p. 143-157Chapter in book (Other academic)
    Abstract [en]

    This study focuses on the effects of cellulose content and cellulose morphology on the structural and mechanical properties of PP/cellulose fibre composites. A detailed structural characterisation was performed, including SEM-BEI analysis of fibre spatial distribution and X-μCT analysis of fibre orientation. The results indicated that the fibres were well-dispersed and oriented mostly along the main direction of the PP/cellulose test specimen. Based on light microscopy it was found that the cellulose fibres acted as nucleators in the PP matrix. By use of DSC it was shown that addition of cellulose fibres increased both the crystallinity and Tc. The increased crystallinity is mainly a result of the transcrystallinity formation. The tensile properties of the composites were affected by the fibre dimensions and the fibre concentration. The long fibres yielded the highest increase of Young's modulus. Elongation at break was mostly affected by the fibre concentration. The results thus indicate that there is a major potential for improving the mechanical properties of fibre-reinforced composites, provided an adequate concentration of fibres is applied.

  • 41. Li, D
    et al.
    Iversen, Tommy
    RISE, Innventia.
    Ek, Monica
    Polyesters and composites based on birch suberin2014Conference paper (Refereed)
  • 42. Li, D
    et al.
    Iversen, Tommy
    RISE, Innventia.
    Ek, Monica
    Polyesters and composites based on birch suberin2014Conference paper (Refereed)
  • 43. Li, Dongfang
    et al.
    Iversen, Tommy
    RISE, Innventia.
    Ek, Monica
    Biocomposites based on birch suberin2012Conference paper (Refereed)
  • 44.
    Lindberg, S.
    et al.
    RISE, Innventia.
    Roos, A.
    Kihlstedt, A.
    RISE, Innventia.
    Lindström, M.
    RISE, Innventia.
    A product semantic study of the influence of the sense of touch on the evaluation of wood-based materials2013In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, p. 300-307Article in journal (Refereed)
  • 45.
    Lindberg, Siv M
    et al.
    RISE, Innventia.
    Béland, Marie-Claude
    RISE, Innventia.
    Edström, Karin
    RISE, Innventia.
    Granberg, Hjalmar
    RISE, Innventia.
    Berthold, Fredrik
    RISE, Innventia.
    Towards a cellulose-based society: Demonstrating the feasibility of new bio-based material concepts and products2016In: Proceedings - D and E 2016: 10th International Conference on Design and Emotion - Celebration and Contemplation, 2016, p. 411-419Conference paper (Refereed)
    Abstract [en]

    In moving towards a cellulose-based society, interdisciplinary effort is required as it is at this interface that new ideas are found and can grow. New bio-based materials will play a key role but getting them into the marketplace is not always straightforward. Many options are available both for sourcing and for producing composite materials from wood-based cellulose and poly-lactic acid (PLA). Depending on how the material is processed, a multitude of properties can be generated. The main goal with this work was to attempt to reduce the research-To-market gap. This was done by testing a new way of working together where we bundled innovation-oriented projects and research-oriented projects around the theme of material experience. We then systematically worked with material demonstrators. In this article, we exemplify the results by focusing on one research-oriented project that did not at the outset have a market context and on one innovation-oriented project with clear market requirements. In addition to introducing a new concept in bundling research-oriented and innovation-oriented projects, this paper contributes several practical examples of what material demonstrators can do. We also present an application and analysis of Moultrie’s extended Science-Technology-Application-Market (STAM) model to analyze the material demonstrators and design phases of the bundled projects. We modified the proposed classification with different types of material demonstrators according to how close they are to an actual product segment. Designers and scientists worked together but with different emphasis in each phase.

  • 46.
    Lindberg, Siv M
    et al.
    RISE, Innventia.
    Hartzen, Ann-Sofie
    Wodke, Thomas
    Lindström, Mikael
    RISE, Innventia.
    Hierarchic design and material identity2013Conference paper (Refereed)
  • 47.
    Lindström, T.
    et al.
    RISE, Innventia.
    Aulin, C.
    RISE, Innventia.
    Market and technical challenges and opportunities in the area of innovative new materials and composites based on nanocellulosics2014In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 29, no 4, p. 345-351Article in journal (Refereed)
  • 48.
    Lindström, Tom
    et al.
    RISE, STFI-Packforsk.
    Banke, K.
    RISE, STFI-Packforsk.
    Larsson, Tomas
    RISE, STFI-Packforsk.
    Glad-Nordmark, Gunborg
    RISE, STFI-Packforsk.
    Boldizar, A.
    Nanoclay plating of cellulosic fiber surfaces2008In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 108, no 2, p. 887-891Article in journal (Refereed)
    Abstract [en]

    A basic problem in making cellulose-reinforced composites is achieving a dispersion of cellulosic fibers in an often olephinic polymer matrix. Drying cellulosic fibers results in the formation of fiber flocs/nodules because of their strong interfiber bonding, and this makes the hydrophilic cellulosic fibers difficult to disperse in a hydrophobic matrix material. One common approach to alleviate floe formation is to adsorb cationic surfactant onto anionically charged cellulose, which reduces the interfiber bonding, decreases floe formation and gives better compatibility with the matrix. In this report, a different approach is taken, namely to adsorb nanoclays onto the cellulosic fibers, and thereby reduce the natural hydrogen-bonding affinity between fibers. In a second report, the same technology will be shown to be advantageous to decrease floe formation in oleophinic composites reinforced with cellulosic fibers. This article summarizes experiments aimed at optimizing the chemistry of deposition of montmorillonite clay onto fiber surfaces. The aim was to optimize the chemical conditions for the heterodeposition of the anionic clay onto cationically charged fluff pulp. The experiments were designed to provide a theoretical framework for the deposition of the nanoclay onto the pulp fibers. High Mw p-DADMAC and an exfoliated clay (achieved by passing the clay through a homogenizer) were used. As expected, a certain degree of charge overcompensation by adding an electrolyte was necessary to bring about deposition. The adsorbed amount of clay could be calculated from the charge balance between the overcompensated charge and the net clay charge, constituting the theoretical framework for nanoclay heterodeposition. As expected, montmorillonite clay greatly destroyed the joint strength between fibers (determined by evaluating the strength of paper made from treated fibers). The surface coverage (determined by ESCA) was shown to be a linear function of the attached amount of clay, and ∌3% clay was required to fully cover the fiber surfaces. © 2008 Wiley Periodicals, Inc.

  • 49. Lobov, G. S.
    et al.
    Zhao, Y.
    Marinins, A.
    Yan, M.
    Li, J.
    Sugunan, Abhilash
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Thylén, L.
    Wosinski, L.
    Östling, M.
    Toprak, M. S.
    Popov, S.
    Dynamic manipulation of optical anisotropy of suspended Poly-3-hexylthiophene nanofibers2016In: Advanced Optical Materials, ISSN 2195-1071, Vol. 4, no 10, p. 1651-1656Article in journal (Refereed)
    Abstract [en]

    Poly-3-hexylthiophene (P3HT) nanofibers are 1D crystalline semiconducting nanostructures, which are known for their application in photovoltaics. Due to the internal arrangement, P3HT nanofibers possess optical anisotropy, which can be enhanced on a macroscale if nanofibers are aligned. Alternating electric field, applied to a solution with dispersed nanofibers, causes their alignment and serves as a method to produce solid layers with ordered nanofibers. The transmission ellipsometry measurements demonstrate the dichroic absorption and birefringence of ordered nanofibers in a wide spectral range of 400–1700 nm. Moreover, the length of nanofibers has a crucial impact on their degree of alignment. Using electric birefringence technique, it is shown that external electric field applied to the solution with P3HT nanofibers can cause direct birefringence modulation. Dynamic alignment of dispersed nanofibers changes the refractive index of the solution and, therefore, the polarization of transmitted light. A reversible reorientation of nanofibers is organized by using a quadrupole configuration of poling electrodes. With further development, the described method can be used in the area of active optical fiber components, lab-on-chip or sensors. It also reveals the potential of 1D conducting polymeric structures as objects whose highly anisotropic properties can be implemented in electro-optical applications.​.

  • 50. Lonnberg, H.
    et al.
    Larsson, K.
    Lindström, T.
    RISE, Innventia.
    Hult, A.
    Malmström, E.
    Synthesis of polycaprolactone-grafted microfibrillated cellulose for use in novel bionanocomposites-influence of the graft length on the mechanical properties2011In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, no 5, p. 1426-1433Article in journal (Refereed)
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