甲基取代的新型聚醚醚酮及其共聚物的合成、表征和性能研究

Synthesis, Characterization and Property Studies on a Methyl-substituted Poly(ether ether ketone) and Its Copolymers

设计合成了一种甲基侧基取代的可溶性聚芳醚酮均聚物 PETMDEK,同时合成了一系列不同比例的无规共聚物 PETMDEK-PEDEK,考察了共聚组成对聚合物性能的影响 .随着共聚物中可溶性 PETMDEK组分的不断增加 ,其聚集态结构也发生变化 ,出现从结晶→液晶→结晶→无定形固体的转变 ,同时溶解性也由可溶向不溶转变 .本文还侧重研究了 PETMDEK组分摩尔分数为 2 0 %的无规共聚物的热致液晶行为 .

A novel soluble methyl-substituted poly(ether ether ketone) PETMDEK was synthesized for the first time by aromatic nucleophilic substitution polycondensation. A series of random copolymers PETMDEK-PEDEK with different compositions were prepared and their properties were studied. The copolymers exhibit changes from crystals→liquid crystals→crystals→amorphous solid transitions with the increase of the content of PETMDEK. The copolymers also change from soluble substance to insoluble one. The thermotropic liquid crystalline behavior of 20% PETMDEK-PEDEK copolymer was characterized by DSC and PLM.