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Thermoresponsive hydrogels of cellulose nanofibrils and triblock copolymers
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center BiMaC Innovation.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating 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, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0003-1161-9311
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Atom transfer radical polymerization (ATRP) has been utilized to synthesize triblock and star-block copolymers of quaternized poly(2-(dimethylamino)ethyl methacrylate) (qPDMAEMA) and poly(di(ethylene glycol) methyl ether methacrylate (PDEGMA). The block copolymers, that all contained a minimum of two charged blocks, were sequential adsorbed to negatively charged cellulose nanofibrils (CNF) in dilute water suspension, forming thermoresponsive hydrogels. The presence of more than one charge block allowed for the polymers to form permanent, physically crosslinked, gels when adsorbed to the CNF. The ability of the polymers to adsorb to CNF was confirmed by quartz crystal microbalance with dissipation monitoring (QCM-D), and the thermoresponsive properties of the gels were investigated by rheological measurements and gravimetric measurements. This method was shown to be promising for the facile, production of thermoresponsive hydrogels composed of CNF.

National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-172930OAI: oai:DiVA.org:kth-172930DiVA: diva2:850770
Note

QS 2015

Available from: 2015-09-02 Created: 2015-09-02 Last updated: 2015-09-02Bibliographically approved
In thesis
1. Thermoresponsive cellulose-based composites by polymer modification
Open this publication in new window or tab >>Thermoresponsive cellulose-based composites by polymer modification
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The interest in utilizing cellulose based materials has grown rapidly in recent years, due to the growing environmental concerns about utilizing fossil based material. One potential application of cellulose is in thermoresponsive materials, which are attracting attention due to their ability of altering conformation when exposed to changes in external temperature. In this study, a variation of cellulose substrates have been utilized; both as the main component and as reinforcing fillers in thermoresponsive composites.

Photoinduced controlled radical polymerization was utilized to graft the thermoresponsive polymer poly(di(ethylene glycol) ethyl ether acrylate) (PDEGA)  from the surface of filter paper. The method showed to be efficient to graft large amounts of polymer from the cellulose surface in short reaction times, while utilizing smaller amounts of catalyst than typically employed in controlled radical polymerizations.

Di-, tri, and star block copolymers of quaternized poly(2-(dimethylamino)ethyl methacrylate) (qPDMAEMA) and poly(di(ethylene glycol) methyl ether methacrylate) (PDEGMA) were synthesized by atom transfer radical polymerization (ATRP), and adsorbed to cellulose nanofibrils (CNFs) in a water dispersion. This provided a simple route for the preparation of thermoresponsive CNF based composites.

Thermoresponsive cryogels of poly(N-isopropylacrylamide) (PNIPAAm), synthesized by free radical polymerization (FRP), were reinforced by the addition of cellulose nanocrystals (CNCs). Two types of CNCs were investigated: neat CNC and CNC with acrylic, polymerizable,  groups attached to its structure. The CNC addition showed to be an efficient way to modify the mechanical properties of the cryogels.

All materials synthesized in this project displayed thermoresponsive properties. Cellulose can therefore be considered to be a promising material for the production of more environmentally friendly thermoresponsive composites.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. 54 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:44
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-172828 (URN)978-91-7595-654-1 (ISBN)
Public defence
2015-09-25, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20150902

Available from: 2015-09-02 Created: 2015-08-31 Last updated: 2017-02-22Bibliographically approved

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Rojas, RamiroMalkoch, MichaelCarlmark, Anna

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Larsson, EmmaIngverud, TobiasHemmer, GuillaumeRojas, RamiroMalkoch, MichaelCarlmark, Anna
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