Hu Jianquan, Li Kai, An Liangliang, Ding Dayong, Chen Sheng, Liu Zhong, Liu Yuxin, Xu Feng
Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science & Technology, Tianjin 300457, China.
Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
Int J Biol Macromol. 2023 Apr 30;235:123841. doi: 10.1016/j.ijbiomac.2023.123841. Epub 2023 Mar 1.
Ionic conductive hydrogels have been widely used for sensor, energy storage and human-machine interface. To address the problems of the traditional ionic conductive hydrogels fabricated with the soaking method, such as the lack of frost resistance, poor mechanical properties, time-consuming and chemical-wasting, herein, a multi-physics crosslinking reinforced strong, anti-freezing and ionic conductive hydrogel sensor is fabricated utilizing the tannin acid-Fe(SO) through the simple one-pot freezing-thawing process at low electrolyte concentration. The results show that the PCT-Fe(SO) (PVACNFTA-Fe(SO)) displayed better mechanical property and ionic conductivity due to hydrogen bonding and coordination interaction. The tensile stress reaches up to 0.980 MPa (570 % strain). Moreover, the hydrogel presents excellent ionic conductivity (0.220 S⋅m at room temperature), anti-freezing performance (0.183 S⋅m at -18 °C), large gauge factor (1.75), excellent sensing stability, repeatability, durability and reliability. This work paves a way for preparing mechanical strong and anti-freezing hydrogel based on multi-physics crosslinking with one-pot freezing-thawing process.
离子导电水凝胶已被广泛应用于传感器、能量存储和人机界面。为了解决传统浸泡法制备的离子导电水凝胶存在的问题，如抗冻性差、力学性能不佳、耗时且浪费化学试剂等，在此，通过在低电解质浓度下采用简单的一锅法冻融过程，利用单宁酸 - 硫酸铁制备了一种多物理交联增强的强韧、抗冻且离子导电的水凝胶传感器。结果表明，由于氢键和配位相互作用，聚氯乙烯 - 单宁酸 - 硫酸铁（PVACNFTA - Fe(SO)）表现出更好的力学性能和离子导电性。拉伸应力高达0.980兆帕（应变570%）。此外，该水凝胶具有优异的离子导电性（室温下为0.220 S·m）、抗冻性能（-18°C时为0.183 S·m）、大的应变片系数（1.75）、出色的传感稳定性、重复性、耐久性和可靠性。这项工作为基于一锅法冻融过程的多物理交联制备机械性能强且抗冻的水凝胶铺平了道路。
