A study on the heat of fusion of β-polypropylene

被引：303

作者：

Li, JX

Cheung, WL ^{[1
]}

Jia, DM

机构：

[1] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China

[2] S China Univ Technol, Dept Polymer Mat Sci & Engn, Guangzhou 510641, Peoples R China

来源：

POLYMER | 1999年 / 40卷 / 05期

关键词：

pure beta-PP; crystallization; heat of fusion;

D O I：

10.1016/S0032-3861(98)00345-0

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Isotactic polypropylene (iPP) resin was doped with 1% of pimelic acid/calcium stearate (composition ratio = 1/1.5). It was crystallized in a two-step isothermal process, first at 130 degrees C and then at 95 degrees C, and finally cooled at a rate of 0.5 degrees C min(-1) to room temperature. The specimens were basically free of alpha-crystals and could be considered as pure beta-PP. The crystallinity of the specimens was determined on the basis of their density. The heat of fusion of the beta-crystal was found to be 168.5 J g(-1). In comparison, the heat of fusion of the alpha-crystal in the undoped resin was slightly higher at 177.0 J g(-1). (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：1219 / 1222

页数：4

共 21 条

[1] MORPHOLOGY OF POLYPROPYLENE CRYSTALLIZED FROM MELT [J].