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(J. Am. Chem. Soc.) Interpenetrating Liquid Crystal Polyurethane/Polyacrylate Elastomer with Ultrastrong Mechanical Property  
(J. Am. Chem. Soc.) Interpenetrating Liquid Crystal Polyurethane/Polyacrylate Elastomer with Ultrastrong Mechanical Property
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关键词: liquid  crystal  elastomer  
资料大小: 1951k
所属学科: 通用高分子材料
来源: 来源网络
简介:
Liquid crystal elastomer (LCE) materials, which have been developed and investigated for four decades, still lack real industrial applications. The fundamental obstacle is the modest force of LCEs generated in the LC-to-isotropic phase transition process, which is the most important actuation moment. Here we report an interpenetrating liquid crystal polyurethane/polyacrylate elastomer material, consisting of one main-chain polyurethane LCE and another liquid crystal polyacrylate thermoset networks which are simultaneously polymerized. This two-way shape memory material can reversibly shrink/expand under thermal stimulus, and shows ultrastrong actuation-mechanic properties. With a maximum shrinkage ratio of 86% at 140 oC which is beyond the LC-to-isotropic phase transition, its actuation blocking stress, actuation work capacity, breaking strength and elastic modulus reach 2.53 MPa, 1267.7 KJ/m3, 7.9 MPa and 10.4 MPa respectively. Such a LCE material can lift up a load 30000 times heavier than its own weight. We hope the outstanding mechanical properties of this IPN-LCE material would pave the way for the real industrial utilizations of LCE-based soft actuators.
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上传时间: 2019-10-04 20:42:19
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