弹性体
材料科学
聚氨酯
单体
热塑性弹性体
硅氧烷
复合材料
液晶
延展性(地球科学)
执行机构
高分子科学
聚合物
共聚物
电气工程
工程类
蠕动
作者
Xueyan Lin,Weike Zou,Eugene M. Terentjev
出处
期刊:Macromolecules
[American Chemical Society]
日期:2022-01-28
卷期号:55 (3): 810-820
被引量:16
标识
DOI:10.1021/acs.macromol.1c02065
摘要
Liquid-crystalline elastomers (LCEs) are frequently used in soft actuator development. However, applications are limited because LCEs are prone to mechanical failure when subjected to heavy loads and high temperatures during the working cycle. A mechanically tough LCE system offers larger work capacity and lower failure rate for the actuators. Herein, we adopt the double-network strategy, starting with a siloxane-based exchangeable LCE and developing a series of double-network liquid-crystalline elastomers (DN-LCEs) that are mechanically tougher than the initial elastomer. We incorporate diacrylate reacting monomers to fabricate DN-LCEs, some of which have the breaking stress of 40 MPa. We incorporate thermoplastic polyurethane to fabricate a DN-LCE, achieving an enormous ductility of 90 MJ/m3. We have also attempted to utilize the aza-Michael chemistry to make a DN-LCE that retains high plasticity because of several bond-exchange mechanisms; however, it failed to produce a stable reprocessable LCE system using conventional ester-based reactive mesogens. Each of these DN-LCEs exhibits unique features and characteristics, which are compared and discussed.
科研通智能强力驱动
Strongly Powered by AbleSci AI