期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 46, 期 -, 页码 26-33出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2012.10.008
关键词
Fibres; Injection moulding
资金
- National Natural Science Foundation of China [51173171, 11172271, 11172272]
- Major State Basic Research Projects [2012CB025904]
- Opening Project of the Key Laboratory of Polymer Processing Engineering, Ministry of Education of Chin
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.
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