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Updated: Sep 15, 2025
A Freeze-Thawing Method to Prepare Chitosan-Polyvinyl alcohol Hydrogels Without Crosslinking Agents and Diflunisal Release Studies
Published on: January 14, 2020
High-mechanical properties, anti-freezing, and self-regeneration zwitterionic poly (ionic liquid) hydrogel reinforced
Dong Fu1, Linhui Xing2, Yang Xie2
1Research Institute of Urbanization and Urban Safety, School of Future Cities, University of Science and Technology Beijing, Beijing 100083, China; Heilongjiang Academy of Sciences, Institute of Advanced Technology, Harbin 150029, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
Abstract:
A novel zwitterionic poly (ionic liquid) hydrogel was constructed through the room-temperature in situ polymerization of acrylamide (Am), 3-(1-vinyl-3-imidazolio) propanesulfonate (ZILs), cellulose nanofibers (CNFs) and lithium chloride (LiCl). The synergistic effects in the network (i.e., multiple-bond interactions, network constructed around rigid CNFs polymerization, and mild chemical cross-linking of the polymer chains) endowed the hydrogel with tensile strength (889 kPa), stretchability (1756 %), tear resistance (fracture energy 2.73 kJ/m2), and puncture toughness (4.76 MJ/m3). Furthermore, satisfactory conductivity (20.8 mS/cm), high sensitivity (gauge factor (GF) up to 15.31), excellent anti-freezing capability (-20 °C), and encouraging self-regeneration property were achieved by introducing LiCl with high hygroscopicity. The work provides a simple and effective strategy for functionalized copolymer hydrogel preparation by designing ionic liquid structures and incorporating natural nanomaterials to expand their practical applications in flexible sensors.
