文献类型：期刊文献

英文题名：Construction and characterization of highly stretchable ionic conductive hydrogels for flexible sensors with good anti-freezing performance

作者：Zhang, Chenyan[1];Wang, Jikui[1];Li, Shuo[1];Zou, Xinquan[1];Yin, Huixian[1];Huang, Yicheng[1];Dong, Feilong[1];Li, Peiyuan[1];Song, Yaoting[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

年份：2023

卷号：186

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：;EI(收录号：20230613550082);WOS:【SCI-EXPANDED(收录号:WOS:000963576400001)】；

语种：英文

外文关键词：Sensor; Anti-freezing; Conductive hydrogel

摘要：As an ideal material for flexible sensors, electrically conductive hydrogels (ECHs) has been faced with water loss and easy freezing, which affects the conductive and tensile properties. Polyacrylamide/sodium alginate/LiCl (PAM/SA/LiCl) hydrogel was constructed to enhance the anti-freezing property without deficiencies of tensile and electrical performance. A semi-interpenetrating network (semi-IPN) was formed by PAM and SA through hydrogen bonding, which performed excellent mechanical property (fracture strain 2100%, fracture stress 110 KPa). LiCl contributed to the high ionic conductivity (up to 21.7 S/m) and sensitivity (Gauge Factor (GF) = 17.45). Double hydrogen bonding of SA and PAM, hydration of LiCl and ion interaction between SA and lithium ion improved the anti-freezing performance and mechanical property of the hydrogel together. The proportion of non-freezing water in system was proved to be significantly increased. The comprehensive properties of the hydrogels were evaluated and PAM/SA/3M LiCl hydrogel kept conductive without obvious loss of stretchability at-30 degrees C. The PAM/SA/LiCl hydrogel integrates remarkable toughness, conductivity, sensitivity and anti-freezing property, which is a suitable choice in smart wearable devices, soft robots and medical monitoring.