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首页> 外文期刊>Journal of Applied Polymer Science >Phase behavior of side-chain liquid-crystalline elastomers and their precursors containing para-nitro azobenzene
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Phase behavior of side-chain liquid-crystalline elastomers and their precursors containing para-nitro azobenzene

机译：含对硝基偶氮苯的侧链液晶弹性体及其前体的相行为

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摘要

Side-chain liquid-crystalline copolymethacrylates (PMm's), containing para-nitro azobenzene as the mesogenic group and 2-hydroxylethyl methacrylate (HEMA) as a comonomer, were synthesized by radical polymerization, and their corresponding liquid-crystalline elastomers (LCEm's) were prepared through chemical crosslinking. All of the polymers (PMm's) and the elastomers studied showed enantiotropic smectic A phases; the clearing temperature (T-i) of the PMm polymers decreased with increasing amount of HEMA, and the T-i of the corresponding LCEm's decreased compared to that of their precursors. Small-angle X-ray scattering studies on the copolymers quenched from their liquid-crystalline phases indicated that the characteristic distance increased with increasing amorphous component content and thus, the amorphous components were in between the smectic layers. (C) 2003 Wiley Periodicals, Inc. [References: 9]
机译：通过自由基聚合反应合成了以对硝基偶氮苯为介晶基团和甲基丙烯酸2-羟乙基乙酯（HEMA）为共聚单体的侧链液晶共聚甲基丙烯酸甲酯（PMm），并制备了相应的液晶弹性体（LCEm）。通过化学交联。研究的所有聚合物（PMm's）和弹性体均显示出对映体近晶A相。 PMe聚合物的透明温度（T-i）随HEMA含量的增加而降低，相应LCEm的T-i与其前体相比降低。从液晶相淬灭的共聚物的小角X射线散射研究表明，特征距离随非晶组分含量的增加而增加，因此，非晶组分位于近晶层之间。 （C）2003 Wiley Periodicals，Inc. [参考：9]

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