β-Crystal in injection moulded poly(ethylene terephthalate) fibre/isotactic polypropylene composite

被引：20

作者：

Ji, Caiqiao ^{[1
]}

Xie, Mancun ^{[1
]}

Chang, Baobao ^{[1
]}

Dai, Kun ^{[1
]}

Wang, Bo ^{[1
]}

Zheng, Guoqiang ^{[1
]}

Liu, Chuntai ^{[1
]}

Shen, Changyu ^{[1
]}

机构：

[1] Zhengzhou Univ, Coll Mat Sci & Engn, Key Lab Mat Proc & Mold, Minist Educ, Zhengzhou, Peoples R China

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2013年 / 46卷

基金：

中国国家自然科学基金;

关键词：

Fibres; Injection moulding; SCANNING-ELECTRON-MICROSCOPY; FLOW-INDUCED CRYSTALLIZATION; SKIN-CORE STRUCTURE; X-RAY-SCATTERING; ISOTACTIC POLYPROPYLENE; SHEAR-FLOW; MICROFIBRILLAR NETWORK; I-PP; MORPHOLOGY; BLENDS;

D O I：

10.1016/j.compositesa.2012.10.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The poly(ethylene terephthalate) (PET) fibre/isotactic polypropylene (iPP) composite was moulded by a mixing-injection moulding machine developed in our group. The molecular orientation and crystallinity of beta-crystal were investigated by two-dimensional wide-angle X-ray diffraction (2D-WAXD), and shish-kebab structure was detected by two-dimensional small-angle X-ray scattering (2D-SAXS). In addition, crystalline morphology of beta-crystal in different regions was observed by scanning electron microscope (SEM). As well known, PET fibre generally serves as heterogeneous nucleating agent for iPP to induce alpha-crystal. Unexpectedly, a remarkably increasing crystallinity of beta-crystal from skin to core region was obtained in the present work, which is substantially different from other studies. Two origins of beta-crystal developed in core region are proposed: (a) local shear caused by the different flow rates of molten iPP and solid PET fibre; (b) survived smectic ordering brought by the rotating screw during plasticization and melt mixing in barrel. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.

引用

页码：26 / 33

页数：8

共 31 条

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