羧基化填料对聚乙烯醇/纳米纤维素水凝胶力学、导电和传感性能的影响  

Effect of carboxylate fillers on mechanical,conductive,and sensing performance of PVA/CNF hydrogel

作　　者：刘伟[1] 吴显 陈小澄 成晓琼 张纯[1] LIU Wei;WU Xian;CHEN Xiaocheng;CHENG Xiaoqiong;ZHANG Chun(School of Materials and Energy Engineering,Guizhou Institute of Technology,Guiyang 550003,China;School of Materials and Construction,Guizhou Norm University,Guiyang 550028,China)

机构地区：[1]贵州理工学院,材料与能源工程学院,贵阳550003 [2]贵州师范大学,材料与建筑工程学院,贵阳550028

出　　处：《中国塑料》2022年第6期16-23,共8页China Plastics

基　　金：贵州省自然科学基金资助项目(黔科合基础-ZK[2022]一般179);贵州省科研机构服务企业行动计划(黔科服企[2018]4010号);贵州理工学院博士启动经费(XJGC20190657)。

摘　　要：利用羧基化碳纳米管(CNT)和纳米纤维素微晶(CNC)与聚乙烯醇/纳米纤维素(PVA/CNF)中形成氢键构建致密的交联网络,并对水凝胶进行增强改性。结果表明,加入3%(质量分数,下同)的CNT可以使水凝胶的拉伸强度由50 kPa提高至120 kPa,而加入3%的CNC能够同时提高水凝胶的拉伸强度和断裂伸长率;加入CNT后能够在水凝胶中构建导电逾渗网络,结合溶剂中的离子导电使得水凝胶的电阻率显著下降;使用PVA/CNF-CNT3水凝胶制作应变传感器,能够实现拉伸、压缩和弯曲等多种应变的快速、准确传感响应。In this work,carboxylate carbon nanotubes(CNTs)and cellulose nanocrystals(CNC)were used to induce a dense crosslinking structure and act as reinforcement agents in poly(vinyl alcohol)(PVA)/cellulose nanofibers composite hydrogels. The results indicated that the tensile strength of the composite hydrogels increased from 50 kPa to 120 kPa with the addition of 3 wt % CNTs,whereas,their tensile strength and elongation at break both increased with the addition of 3 wt % CNC. Meanwhile,the electrical resistance of the composite hydrogels decreased significantly in the presence of CNT due to the formation of a conductive percolation threshold and ionic conductive paths. Therefore,the composite hydrogel with 3 wt % CNT can be selected as a sensing material. The hydrogels designed in this study exhibit a rapid and accurate sensing response to various stresses in tension,compression and bending.

关 键 词：聚乙烯醇 水凝胶 传感器 离子导电 高强度 

分 类 号：TQ320[化学工程—合成树脂塑料工业]