聚丙烯在溶液中的等温结晶行为  

Isothermal crystallization behavior of polypropylene in solution

作　　者：张恒源 刘建叶[1] 王绍杰 徐耀辉[1] 张师军[1] ZHANG Hengyuan;LIU Jianye;WANG Shaojie;XU Yaohui;ZHANG Shijun(SINOPEC(Beijing)Research Institute of Chemical Industry Co,Ltd,Beijing 100013,China)

机构地区：[1]中石化(北京)化工研究院有限公司,北京100013

出　　处：《中国塑料》2023年第1期13-17,共5页China Plastics

基　　金：中国石油化工股份有限公司资助项目(420018)。

摘　　要：采用差示扫描量热仪(DSC)分析聚丙烯(PP)在2种不同溶剂中的等温结晶过程,并使用Avrami方程研究等温结晶动力学。结果表明,晶体生长速率随着结晶温度的升高而降低。同时,根据Lauritzen-Hoffman二次成核理论,PP在溶液中的成核常数Kg和折叠表面自由能σe低于PP原料,反映了其在溶液中的结晶速率较高。The isothermal crystallization behaviors of polypropylene(PP) in two different solvents were analyzed by using differential scanning calorimeter(DSC), and its isothermal crystallization kinetics was studied by using the Avrami’s equation. The results indicated that the crystal growth rate decreased with an increase in crystallization temperature.Meanwhile, the reduction of nucleation constant(Kg) and end surface free energy (σe) indicated that the crystallization rate of PP in solution was higher than that of pure PP according to the Lauritzen–Hoffman’s theory.

关 键 词：聚丙烯 溶液结晶 等温结晶 二次成核理论 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]