中国塑料

中国塑料 ›› 2012, Vol. 26 ›› Issue (10): 50-56 .DOI: 10.19491/j.issn.1001-9278.2012.10.008

• 材料与性能 • 上一篇    下一篇

注射成型PP/PET共混物分子取向研究

易新 李忠明   

  1. 金发科技股分有限公司 四川大学
  • 收稿日期:2012-06-08 修回日期:1900-01-01 出版日期:2012-10-26 发布日期:2012-10-26

Study on the Molecular Orientation Distribution in Structure of Injected Molded PP/PET Blends

Xin YI Zhongming LI   

  • Received:2012-06-08 Revised:1900-01-01 Online:2012-10-26 Published:2012-10-26
  • Contact: Zhongming LI

摘要： 利用二维宽角X射线衍射技术（2DWAXD），研究了聚丙烯/聚对苯二甲酸乙二醇酯（PP/PET）共混物注射成型试样在厚度方向的取向分布结构。结果表明，PP/PET共混物中各层取向度参数都小于纯PP试样，而且取向度参数在厚度方向上的差异也比纯PP小；增容后的PP/PET共混物，从“皮层”到“芯层”取向度参数在0.3～0.4间， “皮芯”结构得到明显抑制；碳纳米管（CNTs）加入到PET分散相中可以促进PET在注射成型周期内结晶，提高其结晶度；加入增容剂后，试样的强度和刚性都比PP高；CNTs的加入使试样的弯曲模量较纯PP提高约20 %。

关键词: 聚丙烯, 聚对苯二甲酸乙二醇酯, 注射成型, 取向结构

Abstract: In this study, the molecular orientation distributions and crystalline structure in the thickness direction of injection molded PP/PET blends were characterized by twodimensional wideangle Xray scattering (2DWAXS). It showed that the orientation parameters for PP/PET blends were lower than neat PP in every layer. Furthermore, the distinction of orientation parameters of the blends between skin layer and core region was also smaller than pure samples. In the sample of compatibilized PP/PET, the orientation parameter along the thickness was about 0.3～0.4, which indicated that the skincore structure of this sample was greatly restrained. Addition of carbon nanotubes(CNTs) accelerated the crystallization rate of PET dispersed phase, and increased the crystallinity. After addition of CNTs, its bending modulus was 20 % higher than pure PP.

Key words: polypropylene, poly(ethylene terephthalate), injection molding, orientation structure

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