芳香环状聚酯二聚体的开环共聚合研究

摘要

两种芳香环状聚酯二聚体 CPA 和6FCPA,在阴离子引发剂苯甲酸钠的存在下,进行熔融开环共聚合,制备线性共聚酯。利用 NMR、DSC、TGA 对开环聚合产物进行了表征,结果表明,共聚产物为无规共聚物,共聚物和均聚物的Tg 之间的关系符合 FOX 方程。开环聚合产物的5%热失重温度均高于370℃,表明产物均具有良好的热稳定性。%Two kinds of aromatic macrocyclic ester dimers prepared from o - phthaloyl dichloride and 4,4’ -(hexafluoroisopropylidene) diphenol or BPA could undergo anionic ring opening copolymerization in the melt using sodium benzoate as the initiator,producing linear, high molecular weight polyesters. The Tgs of homopolymers and co-polymer were at accord with the FOX equation. The results of DSC and NMR analysis showed that the copolymer was random. The 5% weight loss temperatures of homopolymers and copolymer were all higher than 370 ℃, which indica-ted that the products obtained by ROP were thermally stable.