利用Hofmeister效应一步法制备离子导电耐低温强韧PVA水凝胶  

Hofmeister Effect-assisted One Step Fabrication of Ion-conductive,Anti-freezing,and Tough PVA Hydrogels

作　　者：陈继伟 朱慧雯 王海镔[1] 桑建权 李艳花[1] 熊芬 罗建新[1] CHEN Jiwei;ZHU Huiwen;WANG Haibin;SANG Jianquan;LI Yanhua;XIONG Fen;LUO Jianxin(School of Materials Science and Engineering,Hunan Institute of Technology,Hengyang 421002,Hunan,China;School of Computer Science and Engineering,Hunan Institute of Technology,Hengyang 421002,Hunan,China)

机构地区：[1]湖南工学院材料科学与工程学院,湖南衡阳421002 [2]湖南工学院计算机科学与工程学院,湖南衡阳421002

出　　处：《材料导报》2025年第9期213-219,共7页Materials Reports

基　　金：湖南工学院科研启动项目(HQ23037);湖南省教育厅优秀青年项目(23B0827);湖南省应用特色学科材料科学与工程学科(湘教通[2022]351号)。

摘　　要：由于水凝胶的含水量较高,其力学性能和耐低温性能普遍较低。通常多采用降低水含量提高水凝胶力学性能和耐低温性能,但这不利于水凝胶的应用。本工作采用一步浸泡法利用聚乙烯醇(PVA)水凝胶的Hofmeister效应诱导PVA高分子链自组装形成均匀的疏水缠结交联网络和氢键交联网络结构,结合Hofmeister效应中引入的无机盐离子与水分子的水合作用,赋予PVA水凝胶良好的机械柔韧性和耐低温性能,构建了一种具有较高机械柔韧性(断裂强度和断裂伸长率分别为25.02 MPa和935%)和耐低温性能(凝固点为-47.6℃)的PVA水凝胶。此外,盐离子的引入还可以同时为水凝胶的离子导电提供自由移动离子。这种综合性能优异的水凝胶可以应用于具有较宽工作温度和力学性能要求的柔性离子导电领域。Due to the hydrogels with high-water content,hydrogels typically exhibit low mechanical properties and anti-freezing performance.Usually,these performances were improved by reducing the water content of the hydrogels.While this limited the applications of the hydrogels.This work used a one-step soaking method,utilizing the Hofmeister effect to induce the polyvinyl alcohol(PVA)polymer chain self-assemble forming a uniform hydrophobic entangled cross-linked network and hydrogen bond cross-linked network structure.The inorganic salt ions introduced in the Hofmeister effect can also form hydration with water molecules.These can endow the PVA hydrogels good mechanical flexibility and anti-freezing performance,constructing the PVA hydrogels with high mechanical flexibility(breaking strength and elongation at break of 25.02 MPa and 935%,respectively)and anti-freezing performance(freezing point of-47.6℃).Besides,the introduction of salt ions can also provide free-moving ions for the ionic conductivity of the hydrogels.This hydrogel with excellent comprehensive properties can be applied to the field of flexible ionic conductivity with wide operating temperature and mechanical performance requirements.

关 键 词：聚乙烯醇水凝胶 物理交联网络 力学性能 耐低温性能 

分 类 号：TQ311[化学工程—高聚物工业]