不同序列结构的芳香共聚酰胺性能研究

STUDY ON THE PROPERTIES OF AROMATIC COPOLYAMIDES WITH DIFFERENT SEQENCE STRUCTURE

对利用４，４＇－二氨基二苯醚作为第三单体与对苯二甲酰氯、对苯二胺共缩聚得到的不同序列结构的共聚酰胺的性能进行了研究，通过退偏振光法研究了共聚酰胺在浓硫酸中的临界浓度和相图，用ＴＧＡ研究了共聚酰胺的热稳定性，通过降解规律研究了共聚酰胺在浓硫酸中的稳定性，此外，还研究了共聚酰胺的溶解性。结果表明，不同序列结构的共聚酰胺在性能上差异很大，当共聚酰胺分子中ＰＰＴＡ链段序列长度较长时其液晶性能、热稳定性和在浓硫酸中的稳定性，皆优于分子中ＰＰＴＡ链段序列长度较短的共聚酰胺，而溶解性则相反。

In this paper,the properties of copolyamides synthesized from p phenylenediamine,terephthaloyl dichloride and 4,4'-diaminodiphenylether with different seqence structure were studied. The results indicate that the seqence structure of copolyamides significently effect their properties;the longer the seqence length of PPTA segment is,the better the liquid crystal behavior,the thermal stability and stability in concentrated sulphuric acid of copolyamides are; the solubility of copolyamides is on the contrary.