| 1. |
- Ingverud, Tobias, et al.
(author)
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High water-content thermoresponsive hydrogels via electrostatic macrocrosslinking of cellulose nanofibrils
- 2016
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In: Journal of Polymer Science Part A. - : John Wiley & Sons. - 0887-624X .- 1099-0518. ; 54:21, s. 3415-3424
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Journal article (peer-reviewed)abstract
- Atom transfer radical polymerization (ATRP) has been utilized to synthesize tri- and star-block copolymers of poly(di(ethylene glycol)methyl ether methacrylate) (PDEGMA) and quaternized poly(2-(dimethylamino)ethyl methacrylate) (qPDMAEMA). The block copolymers, all with a minimum of two cationically charged blocks, were sequentially used for electrostatic macrocrosslinking of a dilute dispersion of anionic TEMPO-oxidized cellulose nanofibrils (CNF, 0.3 wt%), forming free-standing hydrogels. The cationic block copolymers adsorbed irreversibly to the CNF, enabling the formation of ionically crosslinked hydrogels, with a storage modulus of up to 2.9 kPa. The ability of the block copolymers to adsorb to CNF was confirmed by quartz crystal microbalance with dissipation monitoring (QCM-D) and infrared spectroscopy (FT-IR), and the thermoresponsive properties of the hydrogels were investigated by rheological stress and frequency sweep, and gravimetric measurements. This method was shown to be promising for the facile production of thermoresponsive hydrogels based on CNF.
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| 2. |
- Larsson, Emma, et al.
(author)
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Thermoresponsive hydrogels of cellulose nanofibrils and triblock copolymers
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Other publication (other academic/artistic)abstract
- 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.
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