TPA共缩聚的研究——直接酯化速率的影响因素

TPA CO-CONDENSATION-STUDY ON THE RATE OF DIRECT ESTERIFICATION

通过TPA—ADA(Aliphatic dihydric acid)—EG多元共缩聚直接酯化的研究,分析了共酯化条件对酯化速率的影响。结果表明:酯化温度、压力的提高,将提高酯化速率,加快酯化反应的进行;不同种类脂肪族二元酸的第三单体的加入对酯化速率有不同的影响,在它们加入少量情况下,使酯化速率较TPA—EG混缩聚时大,后又随其加入量的增加而逐步降低。

The effects of the condition of co-esterification on the esterificationrate are analyzed, by studing on the multiple co-condensation direct esteri-fication of TPA-ADA(aliphatic dihydric acid)-EG. The result shows that:the rate of co-esterification reaction is increased and is quick-acting whenthe reaction temperature and pressure are raised; if the different kind ofaliphatic dihydric acid as third monomer is added, the reaction rate isinfluenced differently. When the ADA volume is small, the reaction rateincreases, and then the rate raduces with the increasement of ADA.