Preparation and Phase Behavior of Doubly Thermo-responsive Ionogels

Hang-sheng Zhou; Jin Huang; Lie Chen; Ming-jie Liu

doi:10.11777/j.issn1000-3304.2023.23192

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Preparation and Phase Behavior of Doubly Thermo-responsive Ionogels

Research Article | 更新时间：2024-01-03

- Preparation and Phase Behavior of Doubly Thermo-responsive Ionogels
  增强出版
- Acta Polymerica Sinica Vol. 55, Issue 1, Pages: 108-119(2024)
- 作者机构：
  
  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
- 作者简介：
  
  Lie Chen, E-mail: chenlie@buaa.edu.cn
  Ming-jie Liu, E-mail: liumj@buaa.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2023.23192
  CLC：
- Published：20 January 2024，
  
  Published Online：10 November 2023，
  
  Received：21 July 2023，
  
  Accepted：21 September 2023
- 稿件说明：
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周杭生, 黄金, 陈列, 刘明杰. 双重热响应离子凝胶的构筑及相行为研究. 高分子学报, 2024, 55(1), 108-119

Zhou, H. S.; Huang, J.; Chen, L.; Liu, M. J. Preparation and phase behavior of doubly thermo-responsive ionogels. Acta Polymerica Sinica, 2024, 55(1), 108-119
周杭生, 黄金, 陈列, 刘明杰. 双重热响应离子凝胶的构筑及相行为研究. 高分子学报, 2024, 55(1), 108-119 DOI： 10.11777/j.issn1000-3304.2023.23192.

Zhou, H. S.; Huang, J.; Chen, L.; Liu, M. J. Preparation and phase behavior of doubly thermo-responsive ionogels. Acta Polymerica Sinica, 2024, 55(1), 108-119 DOI： 10.11777/j.issn1000-3304.2023.23192.

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.

Abstract

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

Keywords

Doubly thermo-responsiveUpper critical solution temperatureLower critical solution temperaturePolymer gelIonic liquid

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