双重热响应离子凝胶的构筑及相行为研究  

Preparation and Phase Behavior of Doubly Thermo-responsive Ionogels

作　　者：周杭生 黄金 陈列 刘明杰 Hang-sheng Zhou;Jin Huang;Lie Chen;Ming-jie Liu(School of Chemistry,Beihang University,Beijing 100191;Nerve-Machine Integration and Cognitive Competition Center,Beijing Machine and Equipment Institute,Beijing 100584;International Research Institute for Multidisciplinary Science,Beihang University,Beijing 100191)

机构地区：[1]北京航空航天大学化学学院,北京100191 [2]北京机械设备研究所脑-机一体技术中心,北京100584 [3]北京航空航天大学国际交叉科学研究院,北京100191

出　　处：《高分子学报》2024年第1期108-119,共12页Acta Polymerica Sinica

基　　金：国家重点研发项目(项目号2022YFA1503000);国家自然科学基金(基金号22161142021、22305014);中国博士后科学基金(基金号2021M700317)资助项目。

摘　　要：传统热响应凝胶体系受限于响应机制单一以及响应温度可调性差等问题,难以满足复杂场景中对智能凝胶材料的需求.本文中提出了一种构筑双重热响应离子凝胶的简易策略,通过将改性的半晶型聚乙二醇(PEG)在离子液体(IL)中交联聚合,成功制备出兼具上临界互溶温度(UCST)以及下临界互溶温度(LCST)相行为的双重热响应离子凝胶.其中离子凝胶的UCST相行为基于PEG结晶熔融;而LCST相行为则是由温度影响PEG与IL之间的氢键变化所产生.此外,通过改变高分子含量、聚合物链长和离子液体中阳离子侧链长度,可以实现离子凝胶2种机制下热响应温度的大范围连续调控.同时离子凝胶的热响应相转变伴随着多种物化性质的变化,如光学透过率、机械强度(3.6~0.1 MPa)以及离子电导率.离子凝胶的上述特性使其在智能显示、可穿戴设备以及柔性传感器等领域发挥重要应用.Traditional intelligent thermal-responsive gel system is limited by the single response mechanism and poor tunable response temperature,and it is difficult to meet the demand of intelligent gel materials in complex scenes.In this study,a simple strategy for the construction of doubly thermo-responsive ionogels is proposed.By crosslinking modified semi-crystalline poly(ethylene glycol)(PEG)in ionic liquid(IL),the doubly thermo-responsive ionogel with both upper critical solution temperature(UCST)and lower critical solution temperature(LCST)phase behaviors are successfully prepared.The UCST phase behavior of ionogel is based on the melting of PEG crystalline.And the LCST phase behavior is caused by the change of hydrogen bond between PEG and IL affected by temperature.In addition,by adjusting the content of binary components,the polymer chain length and the type of ionic liquid,the thermo-responsive temperature of ionogel can be continuously controlled in a large range under these two phase-behavior mechanisms.The phase transition of ionogel is accompanied by a variety of physical and chemical properties,such as optical transmittance,mechanical properties(3.6‒0.1 MPa)and ionic conductivity.The special characteristics of ionogel make it play a significant role in the fields of smart display,wearable device and flexible sensor.

关 键 词：双重热响应 上临界互溶温度 下临界互溶温度 高分子凝胶 离子液体 

分 类 号：TQ427.26[化学工程]