中国塑料 ›› 2010, Vol. 24 ›› Issue (12): 63-71 .DOI: 10.19491/j.issn.1001-9278.2010.12.012

• 材料与性能 • 上一篇    下一篇

线形聚丙烯/低密度聚乙烯发泡体系的结晶行为研究

刘伟 刘本刚 王向东 张玉霞 许国志   

  1. 北京工商大学 中国塑料杂志社 北京工商大学材料科学与工程系 轻工业塑料加工应用研究所
  • 收稿日期:2010-12-14 修回日期:1900-01-01 出版日期:2010-12-26 发布日期:2010-12-26

Crystallization Behavior of Linear Polypropylene/Low-density Polyethylene Foaming Systems

LIU Wei Bengang LIU Xiangdong WANG Yuxia ZHANG Guozhi XU   

  • Received:2010-12-14 Revised:1900-01-01 Online:2010-12-26 Published:2010-12-26
  • Contact: Xiangdong WANG

摘要: 通过差式扫描量热仪研究了不同比例线形聚丙烯/低密度聚乙烯(PE-LD)共混发泡体系的结晶熔融行为和非等温结晶动力学,并使用热台偏光显微镜对线形PP/PE-LD共混发泡体系的结晶形态进行了表征。结果表明,PE-LD的加入会降低线形PP的结晶峰温和绝对结晶度,但对其熔融行为影响不显著;而通过非等温结晶动力学研究表明,PE-LD支链的成核作用,改变线形PP结晶过程中的成核和增长方式能够增加球晶数的同时降低球晶半径,形成的晶核具有物理交联点作用,有效地提高了共混物的熔体强度,增加了共混体系的可发性。

关键词: 线性聚丙烯, 低密度聚乙烯, 结晶行为, 结晶动力学

Abstract: Linear polypropylene was blended with low-density polyethylene, and the crystallization behavior was studied by DSC/POM. It showed that low-density polyethylene could decrease the peak crystallization temperature and the absolute crystallinity of linear polypropylene, however, the melt behavior was slightly affected. Moreover, the non-isothermal crystallization kinetics study showed that low-density polyethylene could also increase the amount and reduce the size of spherulites by changing the crystallization nucleation behavior of linear polypropylene. As a consequence,the foaming potentiality of the blends was enhanced.

Key words: linear polypropylene, low-density polyethylene, crystallization behavior, crystallization kinetic

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