利用黄原胶和PEDOT:PSS共同稳定Ga液滴以协同改善聚丙烯酰胺水凝胶的韧性和传感性能  

Using xanthan gum and PEDOT:PSS to costabilize Ga droplets to synergistically improve the toughness and sensing performance of polyacrylamide hydrogels

作　　者：卢奇书 刘温霞 刘小娜 于得海 宋兆萍 王慧丽 李国栋 葛邵华 Qishu Lu;Wenxia Liu;Xiaona Liu;Dehai Yu;Zhaoping Song;Huili Wang;Guodong Li;Shaohua Ge(State Key Laboratory of Biobased Materials and Green Papermaking,Qilu University of Technology,Shandong Academy of Sciences,Jinan 250353,China;Department of Periodontology,School and Hospital of Stomatology,Cheeloo College of Medicine,Shandong University&Shandong Key Laboratory of Oral Tissue Regeneration&Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration,Jinan 250012,China)

机构地区：[1]State Key Laboratory of Biobased Materials and Green Papermaking,Qilu University of Technology,Shandong Academy of Sciences,Jinan 250353,China [2]Department of Periodontology,School and Hospital of Stomatology,Cheeloo College of Medicine,Shandong University&Shandong Key Laboratory of Oral Tissue Regeneration&Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration,Jinan 250012,China

出　　处：《Science China Materials》2023年第9期3723-3734,共12页中国科学（材料科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (52172147 and 22006082);the Natural Science Foundation of Shandong Province (ZR2021MC034, ZR2020MB128 and ZR2021MB035);Shandong Province Key Research and Development Program (2021ZDSYS18);Qilu University of Technology JieBang (QUTJBZ) Program (2022JBZ01-05)。

摘　　要：导电性水凝胶作为一种具有高度延展性和生物相容性的应变传感材料,在柔性应变传感器的制备中受到了广泛的关注.然而,制备同时具有高韧性和优异传感性能的多功能导电水凝胶用于检测细微应变仍然是一项巨大的挑战.本文以聚(3,4-乙烯二氧噻吩):聚苯乙烯磺酸(PEDOT:PSS)和黄原胶(XG)共稳定的液态金属Ga液滴为导电材料,以原位合成和化学交联的聚丙烯酰胺(PAM)为水凝胶基体,研制了一种新型导电水凝胶. PEDOT:PSS与Ga液滴同时构成刚性导电网络, XG构成刚性牺牲网络. Ga液滴在室温下同时促进PAM的原位合成和交联.制备的XG-PEDOT-Ga-PAM水凝胶具有较高的韧性、良好的可塑性和粘附性.作为应变传感材料时,基于该水凝胶的应变传感器具有非常高的灵敏度(175%–300%应变范围内的GF=12.6)、较短的响应/恢复时间(250 ms)、超低的检测极限(0.1%应变)和优异的耐久性(>500次循环).基于水凝胶的应变传感器具有优异的传感性能,能够准确监测从细微的腕部脉搏到大规模的人体关节弯曲等各种人体活动.Conductive hydrogels have attracted tremendous attention in fabricating flexible strain sensors as highly stretchable and biocompatible strain sensing materials.However,fabricating a multifunctional conductive hydrogel simultaneously with high toughness and high sensing performance for monitoring subtle strain is still a great challenge.Herein,we developed a new conductive hydrogel by using poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)and xanthan gum(XG)costabilized soft Ga droplets as conductive materials and using the in situ synthesized and chemically crosslinked polyacrylamide(PAM)as the hydrogel matrix.The PEDOT:PSS simultaneously constitutes a rigid conductive network with Ga droplets,and XG constitutes a rigid sacrificial network.The Ga droplets simultaneously promote the in situ free radical synthesis and crosslinking of PAM at room temperature.The as-prepared XG-PEDOT-Ga-PAM hydrogel shows high toughness,good moldability and adhesiveness.XG-PEDOT-Ga-PAM hydrogel-based strain sensor shows a very high sensitivity(gauge factor=12.6 in the strain range of 175%–300%),short response/recovery time(250 ms),low detection limit(<0.1%)and excellent durability(>500 cycles).The excellent sensing performance of the hydrogel-based strain sensor enabled it to be highly competent in accurately monitoring various human activities from subtle radial pulses to large-scale human joint bending.

关 键 词：聚丙烯酰胺水凝胶 化学交联 液滴 应变传感器 聚苯乙烯磺酸 检测极限 关节弯曲 导电材料 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TQ427.26[自动化与计算机技术—控制科学与工程]