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首页> 外文期刊>Journal of Applied Polymer Science >KINETICS OF ADIABATIC ANIONIC COPOLYMERIZATION OF EPSILON-CAPROLACTAM IN THE PRESENCE OF VARIOUS ACTIVATORS
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KINETICS OF ADIABATIC ANIONIC COPOLYMERIZATION OF EPSILON-CAPROLACTAM IN THE PRESENCE OF VARIOUS ACTIVATORS

机译：多种活化剂存在下ε-己内酰胺的绝热阴离子共聚动力学

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摘要

Adiabatic temperature rise has been recorded as a function of polymerization time to investigate an adiabatic copolymerization kinetics of epsilon-caprolactam (CL) in the presence of several activators, considering different initial copolymerization temperatures ranging from 130 to 160 degrees C. The copolymerization of CL and PEG-diamine has been performed using activators such as tolylene dicarbamoyl dicaprolactam (TDC), hexamethylene dicarbamoyl dicaprolactam (HDC), and cyclohexyl carbamoyl caprolactam (CCC), and sodium caprolactamate as a catalyst. The effect of PEG-diamine on the overall rate of polymerization of CL has been studied by fitting the experimental temperature rise with a new polymerization kinetic equation involving the polymerization exotherm, polymerization-induced crystallization exotherm, and the heat loss due to nonideal adiabatic condition in the experimental situation. Like homopolymerization, the net copolymerization rate is influenced by the variation of activator types in the initiation step. The temperature rise due to polymerization-induced crystallization in copolymerization is drastically decreased with the increasing initial polymerization temperature in the course of polymerization. The high molecular weight and large polydispersity index of copolymers using bifunctional activators indicate that the Claisen type condensation can occur in the course of polymerization processes. (C) 1997 John Wiley & Sons, Inc. [References: 18]
机译：绝热温度升高已记录为聚合时间的函数，以研究在几种活化剂存在下ε-己内酰胺（CL）的绝热共聚动力学，考虑到不同的初始共聚温度为130至160摄氏度。 PEG-二胺已使用诸如甲苯二氨基甲酰基双己内酰胺（TDC），六亚甲基二氨基甲酰基双己内酰胺（HDC）和环己基氨基甲酰基己内酰胺（CCC）和己内酰胺酸钠等催化剂进行活化。通过用新的聚合动力学方程拟合实验温度升高，研究了PEG-二胺对CL整体聚合速率的影响，该方程包括聚合放热，聚合诱导的结晶放热和非理想绝热条件引起的热损失。实验情况。与均聚类似，净共聚速率受引发步骤中活化剂类型的变化影响。随着聚合过程中初始聚合温度的升高，在共聚中由于聚合引起的结晶而引起的温度上升急剧降低。使用双官能活化剂的共聚物的高分子量和大的多分散指数表明，克莱森型缩合可以在聚合过程中发生。 （C）1997 John Wiley＆Sons，Inc. [参考：18]

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