MORPHOLOGICAL-CHANGES IN ISOTACTIC POLYPROPYLENE AS A FUNCTION OF COOLING RATE

被引：136
作者：
PICCAROLO, S
机构：
[1] Dip. Ingegneria Chimica dei Processi e dei Materiali, 90128, Palermo, Viale delle Scienze
来源：
JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS | 1992年 / B31卷 / 04期
关键词：
D O I：
10.1080/00222349208215467
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A new method for monitoring rather than controling thermal history has been applied recently to analyze the crystallization kinetics at high cooling rate of a highly pure isotactic polypropylene, proving that the cooling history relevant to the structure of quenched samples is in the neighborhood of 90-degrees-C. A continuous variation of morphology and crystal structure was obtained with cooling rate. At cooling rates above 20-degrees-C/s, mesomorphic and alpha-monoclinic phases coexist with a morphology characterized by negatively birefringent spherulites surrounded by a weakly birefringent medium; below this value of cooling rate only alpha-monoclinic phase is formed, composed of mixed spherulites.
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页码：501 / 511
页数：11
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