Improving physical properties of poly(vinyl alcohol)/montmorillonite nanocomposite hydrogels via the Hofmeister effect

作     者：郭蓉蓉 余德帅 黄一帆 王森 付聪 朱水洪 易佳 王涵淇 林友辉 Rongrong Guo;Deshuai Yu;Yifan Huang;Sen Wang;Cong Fu;Shuihong Zhu;Jia Yi;Hanqi Wang;Youhui Lin

作者机构：Department of PhysicsResearch Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional Materials ResearchXiamen UniversityXiamen 361005China National Institute for Data Science in Health and MedicineXiamen UniversityXiamen 361102China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2023年第32卷第8期

页      面：6-14页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.12274356) the Fundamental Research Funds for the Central Universities(Grant No.20720220022) the 111 Project(Grant No.B16029)。 

主　　题：nanocomposite hydrogels Hofmeister effect network structure poly(vinyl alcohol) montmorillonite 

摘      要：Hydrogel is a kind of three-dimensional crosslinked polymer material with high moisture content.However,due to the network defects of polymer gels,traditional hydrogels are usually brittle and fragile,which limits their practical applications.Herein,we present a Hofmeister effect-aided facile strategy to prepare high-performance poly(vinyl alcohol)/montmorillonite nanocomposite hydrogels.Layered montmorillonite nanosheets can not only serve as crosslinking agents to enhance the mechanical properties of the hydrogel but also promote the ion conduction.More importantly,based on the Hofmeister effect,the presence of(NH_(4))_(2)SO_(4)can endow nanocomposite hydrogels with excellent mechanical properties by affecting PVA chains aggregation state and crystallinity.As a result,the as-prepared nanocomposite hydrogels possess unique physical properties,including robust mechanical and electrical properties.The as-prepared hydrogels can be further assembled into a high-performance flexible sensor,which can sensitively detect large-scale and small-scale human activities.The simple design concept of this work is believed to provide a new prospect for developing robust nanocomposite hydrogels and flexible devices in the future.