Polymorphic Behavior of Syndiotactic Polypropylene Induced by Heat Treatment

Chemical Research in Chinese Universities ›› 2001, Vol. 17 ›› Issue (4): 452-456.

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Polymorphic Behavior of Syndiotactic Polypropylene Induced by Heat Treatment

DOU Hong-jing, HE Su-qin, ZHUCheng-shen, WANG Liu-yang

Department of Material Engineering, Zhengzhou University, Zhengzhou 450052, P. R. China

Received:2000-09-05 Online:2001-12-24 Published:2011-08-04
Supported by:
Supported by the Talent Bringing New Ideas Science Foundation of Henan University and the Key Teacher Subsidy Plan of Chinese Universities.

Abstract

Abstract: The polymorphic behavior of syndiotactic polypropylene (s-PP) crystallized from the melt under different conditions was investigated by means of WAXD and DSC.The isothermal melt crystallization of s-PP proceeded in form I at t_c≥110 ℃ and in form Ⅱ at t_c<110 ℃.S-PP crystallized nonisothermally from the melt was the mixture of forms Ⅰ and Ⅱ.With increasing the cooling rate(a), the content of form I increased, and the content of form Ⅱ decreased.On heating, at 10 K/min, of quenched s-PP, it crystallized in form Ⅱ at t<70 ℃, continuing heating resulted in form Ⅱ→form I transition, which was an endothermal process.

Key words: Syndiotactic polypropylene, Polymorphic behavior, Heat treatment, WAXD, DSC

DOU Hong-jing, HE Su-qin, ZHUCheng-shen, WANG Liu-yang. Polymorphic Behavior of Syndiotactic Polypropylene Induced by Heat Treatment[J]. Chemical Research in Chinese Universities, 2001, 17(4): 452-456.

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Polymorphic Behavior of Syndiotactic Polypropylene Induced by Heat Treatment

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