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Träger, A., Klein, G., Carrick, C., Pettersson, T., Johansson, M., Wågberg, L., . . . Carlmark, A. (2019). Macroscopic cellulose probes for the measurement of polymer grafted surfaces. Cellulose (London), 26(3), 1467-1477
Open this publication in new window or tab >>Macroscopic cellulose probes for the measurement of polymer grafted surfaces
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2019 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 26, no 3, p. 1467-1477Article in journal (Refereed) Published
Abstract [en]

Abstract: A synthesis protocol was identified to produce covalent grafting of poly(dimethyl siloxane) from cellulose, based on prior studies of analogous ring opening polymerizations. Following this polymer modification of cellulose, the contact adhesion was anticipated to be modified and varied as a function of the polymer molecular mass. The synthetic details were optimized for a filter paper surface before grafting the polymer from bulk cellulose spheres. The adhesion of the unmodified and grafted, bulk cellulose spheres were evaluated using the Johnson–Kendall–Roberts (JKR) theory with a custom build contact adhesion testing setup. We report the first example of grafting poly(dimethyl siloxane) directly from bulk cellulose using ring opening polymerization. For short grafting lengths, both the JKR work of adhesion and the adhesion energy at the critical energy release rate (Gc) were comparable to unmodified cellulose beads. When polymer grafting lengths were extended sufficiently where chain entanglements occur, both the JKR work of adhesion and Gc were increased by as much as 190%. Given the multitude of options available to graft polymers from cellulose, this study shows the potential to use this type of cellulose spheres to study the interaction between different polymer surfaces in a controlled manner. Graphical abstract: [Figure not available: see fulltext.].

Keywords
Adhesion, Cellulose, Contact mechanics, Grafted polymer, Johnson–Kendall–Roberts theory, Deformation, Grafting (chemical), Spheres, Chain entanglements, Critical energy release rate, Grafted polymers, Polymer modifications, Polymer molecular mass, Polymer-grafted surfaces, Roberts, Ring opening polymerization
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37019 (URN)10.1007/s10570-018-2196-2 (DOI)2-s2.0-85059323425 (Scopus ID)
Available from: 2019-01-17 Created: 2019-01-17 Last updated: 2019-07-01Bibliographically approved
Srinivasa, P., Nygårds, M., Hagman, A., Pendergraph, S. & Sundström, J. (2019). On the torsion method for measurement of out-of-plane shear properties. In: International Paper Physics Conference 2019: preprint proceedings. Paper presented at International Paper Physics Conference 2019, Indianapolis, IN, USA, 5-8 May 2019; PaperCon 2019 (pp. 8-13). TAPPI Press
Open this publication in new window or tab >>On the torsion method for measurement of out-of-plane shear properties
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2019 (English)In: International Paper Physics Conference 2019: preprint proceedings, TAPPI Press, 2019, p. 8-13Conference paper, Published paper (Other academic)
Abstract [en]

Torsional loading with combined out-of-plane compressive loading has been studied for its viability in measurement of out-of-plane shear properties. Paperboards of two qualities were evaluated, namely paperboard A, which was a multiply, while paperboard B was a single ply. Both paperboards were produced on commercial paperboard machines. A total of 24 samples were prepared, 12 of each quality, which were tested under four different load levels. Three different out-of-plane compressive load levels were tested in addition to test without compressive load. Results have been presented from the successful tests in terms of torque versus angle of torsion and shear stress versus shear strain plots. It has been demonstrated that the technique was suitable for out-of-plane shear measurements. An order of magnitude agreement in the values of the properties was obtained in the torsional test method and the rigid block shear tests. Results indicated a possible stable post-peak response in shear loading at sample sizes that would provide material properties comparable with that of a homogeneous test. The torsional setup offered benefit of ease of applying out-of-plane axial loads, both in compression and tension.

Place, publisher, year, edition, pages
TAPPI Press, 2019
Keywords
paperboard, board properties, failure mode analysis, torsion test, shear stress, torque, multiply board
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-43252 (URN)
Conference
International Paper Physics Conference 2019, Indianapolis, IN, USA, 5-8 May 2019; PaperCon 2019
Available from: 2020-01-15 Created: 2020-01-15 Last updated: 2020-01-30Bibliographically approved
Karlsson, R.-M. P., Larsson, P. T., Yu, S., Pendergraph, S., Pettersson, T., Hellwig, J. & Wågberg, L. (2018). Carbohydrate gel beads as model probes for quantifying non-ionic and ionic contributions behind the swelling of delignified plant fibers.. Journal of Colloid and Interface Science, 519, 119-129, Article ID S0021-9797(18)30200-5.
Open this publication in new window or tab >>Carbohydrate gel beads as model probes for quantifying non-ionic and ionic contributions behind the swelling of delignified plant fibers.
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2018 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 519, p. 119-129, article id S0021-9797(18)30200-5Article in journal (Refereed) Published
Abstract [en]

Macroscopic beads of water-based gels consisting of uncharged and partially charged β-(1,4)-d-glucan polymers were developed to be used as a novel model material for studying the water induced swelling of the delignified plant fiber walls. The gel beads were prepared by drop-wise precipitation of solutions of dissolving grade fibers carboxymethylated to different degrees. The internal structure was analyzed using Solid State Cross-Polarization Magic Angle Spinning Carbon-13 Nuclear Magnetic Resonance and Small Angle X-ray Scattering showing that the internal structure could be considered a homogeneous, non-crystalline and molecularly dispersed polymer network. When beads with different charge densities were equilibrated with aqueous solutions of different ionic strengths and/or pH, the change in water uptake followed the trends expected for weak polyelectrolyte gels and the trends found for cellulose-rich fibers. When dried and subsequently immersed in water the beads also showed an irreversible loss of swelling depending on the charge and type of counter-ion which is commonly also found for cellulose-rich fibers. Taken all these results together it is clear that the model cellulose-based beads constitute an excellent tool for studying the fundamentals of swelling of cellulose rich plant fibers, aiding in the elucidation of the different molecular and supramolecular contributions to the swelling.

Keywords
Atomic force microscopy, Cellulose, Hydrogel, Small-angle X-ray scattering, Solid state NMR, Swelling, Water uptake
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33334 (URN)10.1016/j.jcis.2018.02.052 (DOI)29486431 (PubMedID)2-s2.0-85042413398 (Scopus ID)
Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2019-06-28Bibliographically approved
Karlsson, P., Pendergraph, S., Larsson, P. T. & Wågberg, L. (2016). Cellulose model probes for unraveling the swelling behavior of wood fibres. In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives: . Paper presented at 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, November 15-16, 2016, Örnsköldsvik, Sweden (pp. 33-34). , Article ID 8.
Open this publication in new window or tab >>Cellulose model probes for unraveling the swelling behavior of wood fibres
2016 (English)In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016, p. 33-34, article id 8Conference paper, Oral presentation with published abstract (Other academic)
Keywords
cellulose, wood fibre, swelling, adsorption
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-29120 (URN)
Conference
7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, November 15-16, 2016, Örnsköldsvik, Sweden
Available from: 2017-03-14 Created: 2017-03-14 Last updated: 2019-06-28Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9653-1583

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