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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis, Characterization and Liquid Crystalline Properties of Polyacrylates and Polymethacrylates Containing Aryl Ester Pendant Unit
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Synthesis, Characterization and Liquid Crystalline Properties of Polyacrylates and Polymethacrylates Containing Aryl Ester Pendant Unit

机译：含芳基酯侧链单元的聚丙烯酸酯和聚甲基丙烯酸酯的合成，表征和液晶性能

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摘要

Aryloxycarbonylphenyl acrylates and methacrylates were prepared by reacting 4-acryloyloxybenzoyl chloride and 4-methacryloyloxybenzoyl chloride with different phenols. They were homopolymerized using benzoyl peroxides as the initiator at 65degC in dimethylformamide. The polymers were characterized by IR and ~1H-NMR spectra and size exclusion chromatography. Differential scanning calorimetry and polarizing optical microscopy studies revealed that the phenyl esters of poly(4-acryloy-loxybenzoic acid) and poly(4-methacryloyloxybenzoic acid )did not show any liquid crystalline properties, but para-aryl-substituted phenyl esters did exhibit mesophase properties in the temperature range of 98-265degC depending on the nature of the aryl substituent. Polymethacrylates exhibit higher T_g, and lower T_m and T_i than the polyacrylates having the same pendant mesogen. Thermogravimetric analyses have shown that the initial decomposition temperatures of the polymers are above 230degC.
机译：通过使4-丙烯酰氧基苯甲酰氯和4-甲基丙烯酰氧基苯甲酰氯与不同的酚反应来制备丙烯酸和甲基丙烯酸芳氧基羰基苯酯。使用过氧化苯甲酰作为引发剂在65°C下的二甲基甲酰胺中进行均聚。通过IR和〜1H-NMR光谱以及尺寸排阻色谱对聚合物进行表征。差示扫描量热法和偏光光学显微镜研究表明，聚（4-丙烯酰氧基苯甲酸）和聚（4-甲基丙烯酰氧基苯甲酸）的苯酯没有显示任何液晶性质，但是对芳基取代的苯酯确实显示出中间相取决于芳基取代基的性质，其在98-265℃的温度范围内的性质。与具有相同侧基液晶元的聚丙烯酸酯相比，聚甲基丙烯酸酯表现出更高的T_g，以及更低的T_m和T_i。热重分析表明，聚合物的初始分解温度高于230℃。

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