PARTIAL MELTING AND RECRYSTALLIZATION OF ISOTACTIC POLYPROPYLENE  

作　　者：傅强 

机构地区：[1]Department of Polymer Science and Materials,Sichuan University,State Key Laboratory of Polymer Materials Engineering

出　　处：《Chinese Journal of Polymer Science》2010年第1期77-83,共7页高分子科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.50533050 and 20634050)

摘　　要：A relatively high predetermined crystallization temperature （135℃） was chosen to grow well developed iPP spherulites, then the partial melting was carried out at a temperature of 165℃, where the preformed spherulites were seen to only decrease their size but not completely melted. The crystallization behavior of partially melted isotactic polypropylene （iPP） has been carefully examined by different scanning calorimetry （DSC） and polarized light microscopy （PLM）. The experimental results show that at a special annealing temperature （165℃） the melting behavior of iPP includes two parts with different mechanism, one part is the melting of iPP spherulite outside, another is the partial lamellae perfection during longer annealing time in the unmelted spherulite. The conformational orders of the iPP melt decrease with the increase of the annealing temperature.A relatively high predetermined crystallization temperature （135℃） was chosen to grow well developed iPP spherulites, then the partial melting was carried out at a temperature of 165℃, where the preformed spherulites were seen to only decrease their size but not completely melted. The crystallization behavior of partially melted isotactic polypropylene （iPP） has been carefully examined by different scanning calorimetry （DSC） and polarized light microscopy （PLM）. The experimental results show that at a special annealing temperature （165℃） the melting behavior of iPP includes two parts with different mechanism, one part is the melting of iPP spherulite outside, another is the partial lamellae perfection during longer annealing time in the unmelted spherulite. The conformational orders of the iPP melt decrease with the increase of the annealing temperature.

关 键 词：Isotactic polypropylene ANNEALING Partially melting Re-crystallization. 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] TQ026.5