摘要
聚碳酸酯的酯交换缩聚工艺具有绿色环保的特性,符合当今世界可持续发展的主题,相对于传统的光气法工艺更具有发展前途。综述了国内外在酯交换缩聚工艺的机理以及催化剂选择和工艺条件上取得的进展。指出碳酸二苯酯与双酚A酯交换反应是四面体机理,正反应是二级反应,逆反应是三级反应;以La(ACAC)_3作催化剂,得到的产品不但粘均分子量较高,而且热稳定性非常好;利用酯交换熔融聚合工艺可以解决传统光气法的环境问题,而固相聚合可以得到超高分子量的产品。
The mechanism, choice of catalysts and process condition for transesterification and polycondensation of diphenyl carbonate （DPC） with bisphenol A（BPA） for synthesis of polycarbonate（PC） were reviewed and prospects in transesterification polymerization were discussed. Transesterification of DPC and BPA is of reversible nature and follows a tetrahedral mechanism, with forward reaction of second order and reverse reaction of third order. PC samples with high molecular weight and thermal stability were obtained over La（ACAC）3.
出处
《工业催化》
CAS
2010年第8期12-17,共6页
Industrial Catalysis
关键词
高分子化学
聚碳酸酯
酯交换
缩聚
四面体机理
polymer chemistry
polycarbonates
transesterification
polycondensation
tetrahedral mechanism
