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Biomimetic adsorption of zwitterionic-xyloglucan block copolymers to CNF: towards tailored super-absorbing cellulose materials
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. University of Sheffield, United Kingdom.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-8348-2273
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2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 24, p. 14947-14958Article in journal (Refereed) Published
Abstract [en]

A biomimetic, facile approach to cellulose modification is the utilisation of self-adsorbing, naturally occurring biopolymers, such as the hemicellulose xyloglucan (XG). Herein, XG-block-poly(sulfobetaine methacrylate) (XG-b-PSBMA) zwitterionic block copolymers have been prepared and assessed for their ability to adsorb to cellulose, specifically cellulose nanofibrils (CNF). The polymers were synthesised using reversible addition-fragmentation chain-transfer (RAFT) polymerisation, employing an XG macromolecular RAFT agent (XG-RAFT), polymerising a sulfobetaine methacrylate (SBMA) under aqueous conditions. The incorporation of the XG block shifted the upper critical solution temperature (UCST) values to higher temperatures (20 and 30 °C) compared with the PSBMA homopolymers (17 and 22 °C) and the transition was also broadened. The adsorption of the polymers to a CNF surface was monitored using quartz crystal microbalance with dissipation monitoring (QCM-D), showing that the XG block enhanced the adsorption of the zwitterionic polymer. The formation of CNF-composite films was achieved utilising a facile vacuum filtration methodology, and the targeted compositions were confirmed by FT-IR and TGA analyses. The films exhibited high degrees of swelling in water, which were investigated at two different temperatures, 5 and 60 °C (below and above the polymer USCT values). These results highlight the advantage of using an XG block for the biomimetic modification of cellulose to form new cellulose-composite materials such as super-absorbing films.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2017. Vol. 7, no 24, p. 14947-14958
Keywords [en]
Adsorption, Biomimetic materials, Biomimetics, Biopolymers, Block copolymers, Cellulose, Cellulose films, Composite films, Films, Free radical polymerization, Polymer films, Quartz crystal microbalances, Swelling, Biomimetic modification, Cellulose modifications, Macromolecular raft agents, Quartz crystal microbalance with dissipation monitoring, Reversible addition fragmentation chain transfer, Upper critical solution temperature, Zwitterionic block copolymers, Zwitterionic polymers, Polymers
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-207435DOI: 10.1039/c6ra28236aISI: 000396150900075Scopus ID: 2-s2.0-85014826088OAI: oai:DiVA.org:kth-207435DiVA, id: diva2:1098215
Note

QC 20170523

Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-11-29Bibliographically approved

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Hatton, FionaEngström, JoakimMalmström, EvaCarlmark, Anna

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Hatton, FionaEngström, JoakimForsling, JosefineMalmström, EvaCarlmark, Anna
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