中国塑料 ›› 2011, Vol. 25 ›› Issue (04): 22-27 .DOI: 10.19491/j.issn.1001-9278.2011.04.005

• 材料与性能 • 上一篇    下一篇

原位增容PA6/PE-HD共混物的等温结晶动力学研究

王忠强 胡国胜 周秀苗   

  1. 中北大学高分子研究所
  • 收稿日期:2010-11-19 修回日期:2010-12-16 出版日期:2011-04-26 发布日期:2011-04-26

Study on Isothermal Crystallization Kinetics of In-situ Compatibilized PA6/PE-HD Blends

WANG Zhongqiang HU Guosheng ZHOU Xiumiao   

  • Received:2010-11-19 Revised:2010-12-16 Online:2011-04-26 Published:2011-04-26
  • Contact: WANG Zhongqiang

摘要: 采用差示扫描量热仪研究了原位增容聚酰胺6/高密度聚乙烯(PA6/PE-HD)共混物的等温结晶行为,采用Avrami方程分析了纯PA6和PA6/PE-HD共混物的等温结晶动力学,并通过Hoffman-Weeks方法计算出了共混物的平衡熔点。结果表明,二者的Avrami指数介于2.19~3.70之间,表明PA6晶体的生长方式为二维盘状生长和三维球晶生长并存,PE-HD的加入并没有影响PA6晶体的生长方式。偏光显微镜分析表明,纯PA6能够生成球晶,但加入PE-HD后,球晶尺寸明显变小,说明PE-HD的加入起到了异相成核的作用,加快了PA6的结晶过程。

关键词: 高密度聚乙烯, 聚酰胺6, 原位增容, 等温结晶动力学

Abstract: The isothermal crystallization behavior of in-situ compatibilized polyamide 6/high density polyethylene (PA6/PE-HD) blends was studied using differential scanning calorimetry. The isothermal crystallization kinetics was analyzed using Avrami equation. The calculated Avrami index n was between 2.19 and 3.70, which demonstrated that the crystallization of PA6/PE-HD blends was growing three-dimensionally, which was confirmed by polarized optical microscopy observation. The equilibrium melting temperatures of PA6/PE-HD blends were obtained from Hoffman-Weeks method. With the addition of PE-HD, the size of PA6 spherulites became smaller obviously, which indicated that PE-HD played a role of heterogeneous nucleation.

Key words: high density polyethylene, polyamide 6, in-situ compatibilization, isothermal crystallization kinetics