Interpenetrating Liquid-Crystal Polyurethane/Polyacrylate Elastomer with Ultrastrong Mechanical Property
Interpenetrating Liquid-Crystal Polyurethane/Polyacrylate Elastomer with Ultrastrong Mechanical Property
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DOI：
10.1021/jacs.9b06757
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发表时间：
2019-09-11
影响因子：
15
通讯作者：
Yang, Hong
中科院分区：
文献类型：
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作者：
Lu, Hai-Feng;Wang, Meng;Yang, Hong
液晶弹性体（LCE）材料已经开发和研究了40年，但仍然缺乏真实的工业应用。根本的障碍是在LC到各向同性相变过程中产生的LCE的适度力，这是最重要的驱动力矩。在这里，我们报告了互穿液晶聚氨酯/聚丙烯酸酯弹性体材料，由一个主链聚氨酯LCE和另一个液晶聚丙烯酸酯热固性网络，这是同时聚合。这种双向形状记忆材料可以在热刺激下可逆地收缩/膨胀，并显示出超强的致动力学性能。在140 ℃时的最大收缩率为86%，这超出了LC到各向同性相变，其致动阻断应力、致动做功能力、断裂强度和弹性模量分别达到2.53 MPa、1267.7 kJ/m3、7.9 MPa和10.4 MPa。这种LCE材料可以举起比其自身重量重30000倍的负载。我们希望这种互穿聚合物网络-LCE材料的优异机械性能将为基于LCE的软致动器的真实的工业应用铺平道路。
Liquid-crystal elastomer (LCE) materials, which have been developed and investigated for 4 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 network, which are simultaneously polymerized. This two-way shape memory material can reversibly shrink/expand under thermal stimulus and show ultrastrong actuation-mechanics properties. With a maximum shrinkage ratio of 86% at 140 degrees C, 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/m(3), 7.9 MPa, and 10.4 MPa, respectively. Such LCE material can lift up a load 30 000 times heavier than its own weight. We hope the outstanding mechanical properties of this interpenetrating polymer network-LCE material would pave the way for real industrial utilizations of LCE-based soft actuators.