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首页> 外文期刊>Synthetic Metals >Synthesis and properties of liquid crystalline conjugated disubstituted polyacetylene containing cyanoterphenyl mesogenic pendant
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Synthesis and properties of liquid crystalline conjugated disubstituted polyacetylene containing cyanoterphenyl mesogenic pendant

机译：含氰基苯基介晶侧基的液晶共轭二取代聚乙炔液晶的合成及性能

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摘要

Novel acetylene monomers containing cyanoterphenyl groups, namely, 4-[(4'-cyano-4-terphenylyl)oxy]-1-butyl-l-butyne M(l) and 3-[(4'-cyano-4-terphen-ylyl)oxy]-l-phenyl-l-proyne M(2) are synthesized, M(l) was polymerized with WCl_6-PhSn_4 catalyst successfully to give the liquid crystalline conjugated disubstituted polyacetylene containing cyanoterphenyl mesogenic pendant P(l). Polymerization of monomer M(2) was carried out in a series of different solution, but did not obtain any product. The results indicate that the stereoeffect of the bulky cyanoterphenyl group and phenyl seems to inhibit the reaction. The structures and properties of the disubstituted polyacetylene P(l) and monomers were characterized and evaluated with nuclear magnetic resonance, infrared spectroscopy, thermo-gravimetry, differential scanning calorimetry, polarized optical microscopy, ultraviolet spectroscopy, and photoluminescence. The monomers show enantiotropic smectic phases in the heating and cooling processes, while the polymer P(l) exhibits a nematic phase when observed with a polarizing optical microscope. The existence of the chromophoric cyanoterphenyl core endows the monomers with high photoluminescence, and the polymer P(l) prepared from M(l) can emit a strong UV light of 411 nm.
机译：含有氰基三苯基的新型乙炔单体，即4-[（（4'-氰基-4-叔苯基基）氧基] -1-丁基-1-丁炔M（l）和3-[（4'-氰基-4-萜烯-合成了M（2），用WCl-6-PhSn_4催化剂成功地聚合了M（1），得到了含有氰基三苯甲基介晶侧基P（l）的液晶共轭二取代聚乙炔。单体M（2）的聚合反应在一系列不同的溶液中进行，但未获得任何产物。结果表明，庞大的氰基三苯基和苯基的立体效应似乎抑制了该反应。用核磁共振，红外光谱，热重分析，差示扫描量热法，偏光显微镜，紫外光谱和光致发光对二取代聚乙炔P（l）和单体的结构和性质进行了表征和评估。单体在加热和冷却过程中显示对映体近晶相，而当用偏振光学显微镜观察时，聚合物P（1）显示出向列相。发色的氰基三苯基苯基核的存在使单体具有高的光致发光，并且由M（1）制备的聚合物P（1）可以发出411nm的强UV光。

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