Fabrication of isotactic polypropylene casting film and its structural evolution during stretching

被引：0

作者：

Zhang B. ^{[1
]}

Li Z. ^{[2
,3
]}

Zhao D. ^{[1
]}

Qian C. ^{[1
]}

Wang B. ^{[2
,3
]}

Pan P. ^{[2
,3
]}

机构：

[1] China Tobacco Zhejiang Industrial Company Limited, Zhejiang, Hangzhou

[2] State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Zhejiang, Hangzhou

[3] Institute of Zhejiang University-Quzhou, Zhejiang, Quzhou

来源：

Huagong Xuebao/CIESC Journal | 2023年 / 74卷 / 12期

关键词：

crystallization; film; isotactic polypropylene; polymer processing; β nucleating agent;

D O I：

10.11949/0438-1157.20230971

中图分类号：

学科分类号：

摘要：

Polymer films often experience complex temperature fields and tensile fields during processing. Stretching affects the aggregated structure by inducing molecular chain orientation, thereby affecting various properties of the film. Compared to other crystal modifications, β crystal isotactic polypropylene (iPP) has much better mechanical properties. In this work, we used WBG to improve the β crystal content of iPP and investigated its structural evolution during casting and post-stretching. With the increase of draw ratio and the decrease of temperature, the crystallinity and tensile strength of iPP casting film increase, however, the β crystal content decreases. During the post stretching process, increasing the stretch temperature and strain accelerates the transition of iPP from β crystal to α crystal. Meanwhile, cavitation occurs at the late stage of post-stretching, which provides the foundation of iPP microporous membrane preparation. © 2023 Materials China. All rights reserved.

引用

页码：4997 / 5005

页数：8

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