混合苯二甲酸共聚酯的研制及其性能研究

Preparation of polyester ionomer from phthalic acid mixture and its properties

使用300 L通用聚合反应器,以对苯二甲酸（PTA）和间苯二甲酸（PIA）为原料,按照一定混合比例与乙二醇进行酯化和缩聚反应,制得聚混合苯二甲酸乙二醇酯（PETI）;探讨了PETI的热性能及加工性能,并以PETI为原料,分别使用小釜反应器和Mucell发泡仪进行发泡实验。结果表明：随着PIA含量的增加,PETI的玻璃化转变温度降低（均为60~70℃）,吸水率降低;PIA质量分数为28%时,PETI有少量结晶,同时具有较好的微孔发泡加工性能。

Poly（ ethylene terephthalate） ionomer（ PETI） was prepared by esterification and polycondensation reactions between ethylene glycol and a mixture of terephthalic acid（ PTA） and isophthalic acid（ PIA） with a certain blend ratio on a universal 300 L polymerization reactor. The thermal property and processing performance of PETI were discussed. The foaming experiment of PETI was conducted by using a small reactor and Mucell foaming apparatus. The results showed that the glass transition temperature of PETI was decreased to 60- 70 ℃ and the water absorption rate of PETI was also decreased as PIA content was inreased;PETI generated a small amount of crystal and exhibited favorable microporous foaming performance as the mass fraction of PIA was 28%.