High water-content thermoresponsive hydrogels via electrostatic macrocrosslinking of cellulose nanofibrils
2016 (English)In: Journal of Polymer Science Part A: Polymer Chemistry, ISSN 0887-624X, E-ISSN 1099-0518, Vol. 54, no 21, 3415-3424 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
John Wiley & Sons, 2016. Vol. 54, no 21, 3415-3424 p.
ATRP, cationic block copolymer, cellulose nanofibrils, hydrogels, thermoresponsive, Atom transfer radical polymerization, Block copolymers, Cellulose, Electrostatics, Ethylene, Ethylene glycol, Free radical reactions, Infrared spectroscopy, Nanofibers, Quartz crystal microbalances, 2-(dimethylamino)ethyl methacrylate, Cross-linked hydrogels, Gravimetric measurements, Quartz crystal microbalance with dissipation monitoring, Star block copolymer, Thermo-responsive, Thermo-responsive hydrogels
IdentifiersURN: urn:nbn:se:kth:diva-195220DOI: 10.1002/pola.28225ISI: 000386657600003ScopusID: 2-s2.0-84988040360OAI: oai:DiVA.org:kth-195220DiVA: diva2:1047396
QC 201611172016-11-172016-11-022016-11-29Bibliographically approved