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将己二酸、辛二酸、癸二酸、1,10-十二烷基羧酸经酰氯化后,分别与对羟基苯甲酸合成,得到了四种二元羧酸以及与其相应的四种二元酰氯,并发现前者具有热致液晶性。 将上述单体与对苯二酚、氯代对苯二酚以及联苯二酚用溶液缩聚的方法合成了十二种规则共聚酯,并用热台偏光显微镜、DSC、X-衍射等方法对共聚酯进行了表征。结果发现各共聚酯均为向列型热致液晶,并都具有较宽的液晶态温度范围。通过改变分子结构可使共聚酯的熔点在150—300℃之间变化。
After adipic acid, suberic acid, sebacic acid and 1,10-dodecyl carboxylic acid were chlorinated, they were respectively synthesized with p-hydroxybenzoic acid to obtain four kinds of dicarboxylic acids and their corresponding four kinds Dibasic acid chloride and found to have thermotropic liquid crystallinity. Twelve regular copolyesters were synthesized by polycondensation of the above monomers with hydroquinone, chlorinated hydroquinone and biphenol with solution, and analyzed by hot stage polarizing microscope, DSC, X-ray diffraction and other methods Copolyester was characterized. As a result, it was found that all the copolyesters are nematic thermotropic liquid crystals and all have a wide temperature range of the liquid crystal. The melting point of the copolyester can be varied between 150 and 300 ° C by changing the molecular structure.