中国塑料 ›› 2008, Vol. 22 ›› Issue (11): 38-42 .DOI: 10.19491/j.issn.1001-9278.2008.11.008

• 材料与性能 • 上一篇    下一篇

聚丙烯/纳米CaCO3复合材料的结晶行为研究

包崇龙,朱耕宇,陈雪萍,浦 群,叶继华   

  1. 浙江大学化学工程国家重点实验室,浙江大学化学工程与生物工程学系,浙江 杭州310027
  • 收稿日期:2008-01-01 修回日期:1900-01-01 出版日期:2008-11-26 发布日期:2008-11-26

Crystallization Behavior of PP and PP/Nano-CaCO3 Composites

BAO Chong-long,ZHU Geng-yu,CHEN Xue-ping,PU Qun,YE Ji-hua   

  1. State Key Laboratory of Chemical Engineering of Zhejiang University,Department of Chemical and Biochemical Engineering of Zhejiang University, Hangzhou 310027,China
  • Received:2008-01-01 Revised:1900-01-01 Online:2008-11-26 Published:2008-11-26
  • Contact: ZHU Geng-yu

摘要: 用超重力法制备的纳米CaCO3和PP熔融共混制备了PP/CaCO3复合材料,并对PP/CaCO3复合材料的结晶行为进行了详细研究。差示扫描量热分析表明,纳米CaCO3粒子的加入加快了PP的结晶速率,缩短了半结晶时间,130℃时含15份纳米CaCO3的PP/CaCO3复合材料的半结晶时间比纯PP的减少了8.92 min;结晶度有轻微下降,结晶温度为126.5 ℃时纯PP的结晶度为44.33 %,含15份纳米CaCO3的PP/CaCO3复合材料的结晶度为35.9 %。动力学研究数据表明,等温结晶过程符合Avrami方程,PP/CaCO3的n和k值都大于纯PP的;利用偏光显微镜观察了PP/CaCO3复合材料的结晶形貌及结晶生长过程,纳米CaCO3粒子的加入使球晶数量明显增多,意味着CaCO3起到了结晶成核剂的作用。

关键词: 聚丙烯, 纳米碳酸钙, 结晶行为

Abstract: The crystallization behavior of PP/CaCO3 composites were investigated by means of differential scanning calorimeter (DSC) and polarized light microscope (PLM). DSC data showed that CaCO3 could serve as a nucleating agent, resulting in an enhancement of the overall crystallization rate. The crystal morphology of PP/CaCO3 composite was observed by polarized light microscope (PLM). A constant spherulite growth rate was observed at given isothermal crystallization temperature.

Key words: nano-CaCO3, polypropylene, crystallization behavior