稀土催化聚酯和共聚酯的合成

Synthesis of Polyester and Copolyester Catalyzed by Rare Earth Compounds

研究Ｌｎ３＋ 化合物对聚对苯二甲酸乙二酯及其共聚酯合成反应的催化效果。发现Ｌｎ３＋ 可促进酯化反应的进行， 并可在缩聚阶段作为Ｓｂ２Ｏ３ 的助催化剂使用。通过粘度降测试表明， 添加Ｌｎ３ ＋ 不影响聚酯、共聚酯的热稳定性。对Ｌｎ３＋ 催化酯化和缩聚反应机制进行了探讨。

The catalytic effects of Ln 3+ on synthesis of polyethylene terephthalate and its copolyesters were studied. The direct esterification reaction of terephthalate acid with ethylene glycol can be accelerated by the addition of Ln 3+ , and the Ln 3+ compound can be acted as promoter of Sb 2O 3 in the stage of polycondensation. The mechanism of esterification and polycondensation by the addition of Ln 3+ was discussed. The heat stabilities of polyethylene terephthalate and its copolyesters obtained by the addition of Ln 3+ were also investigated.