Monodomain liquid crystal main chain elastomers by photocrosslinking
Monodomain liquid crystal main chain elastomers by photocrosslinking
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DOI：
10.1002/marc.200700210
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发表时间：
2007-07-17
影响因子：
4.6
通讯作者：
Zentel, Rudolf
中科院分区：
文献类型：
--
作者：
Beyer, Patrick;Terentjev, Eugene M.;Zentel, Rudolf
提出了一种用侧向功能化聚酯光交联法制备宏观定向同晶主链液晶弹性体（MC-LCE）的新方法。x射线测量证明了单畴的形成，并允许定量确定有序参数。我们的材料在从液晶到各向同性相转变时的热致动通过样品长度的温度相关测量来证明，显示出大约40%的完全可逆的形状变化。机械测量表明，样品可以沿着近晶层法向拉伸高达60%，而不会改变结构的方向，这与早期的实验和理论预测形成了对比。在不同类型的近晶材料的有限近晶层相关的背景下讨论了这些结果。
A new synthetic strategy for the preparation of macroscopically oriented smectic main chain liquid crystal elastomers (MC-LCE) by the photocrosslinking of laterally functionalized polyesters is presented. X-ray measurements proved the formation of the monodomain and allowed a quantitative determination of the order parameter. The thermo-actuation of our material at the phase transition from the liquid-crystalline to the isotropic phase was demonstrated by temperature dependent measurements of the sample length, showing a fully reversible shape change of approximate to 40%. Mechanical measurements showed that the sample can be stretched by up to 60% along the smectic layer normal without any reorientation of the structure, in contrast to earlier experiments and theoretical predictions. The results are discussed in the context of limited smectic layer correlation in different types of smectic materials.