期刊
BIOMACROMOLECULES
卷 20, 期 7, 页码 2545-2556出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.biomac.9b00327
关键词
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资金
- PolyNat Carnot Institute (Investissements d'Avenir) [ANR-16-CARN-0025-01]
- LabEx Tec 21 (Investissements d'Avenir) [ANR-11-LABX-0030]
- Region Rhone-Alpes
- Knut and Alice Wallenberg foundation through the Wallenberg Wood Science Centre (WWSC)
This study investigates the adsorption of a block copolymer composed of a poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) cationic polyelectrolyte and a poly(di(ethylene glycol) methyl ethermethacrylate) (PDEGMA) on oxidized cellulose nanocrystals (TO-CNCs) to produce hydrogels. PDMEAMA-b-PDEGMA was synthesized by atom-transfer radical polymerization. The extent and dynamics of the adsorption of PDMAEMA-b-PDEGMA on TO-CNCs were determined by electromechanical microbalance and optical techniques. Electrostatic adsorption was identified on TO-CNCs with the quaternized block copolymer. Small-angle neutron scattering experiments were performed to investigate the polymer behavior on the TO-CNC surfaces. Depending on the temperature, block copolymer induces the aggregation of nanocrystals after adsorption by connecting CNCs bundles with block copolymer chains. A reversible liquid-to-gel transition, triggered by temperature, was clearly detected by rheological measurements for the copolymer-CNC mixtures. At the optimal copolymer to CNC ratio the viscosity increased by 4 orders of magnitude at low shear rates. These stimuli-responsive CNC-based materials could be used as injectable biomedical systems.
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