高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (6): 1183.

• 研究论文 • 上一篇    下一篇

茂金属聚乙烯的非等温结晶行为及其动力学研究

彭娅1, 傅强1, 刘结平2, 何天白2   

  1. 1. 四川大学高分子材料系, 高分子材料工程国家重点实验室, 成都 610065;
    2. 中国科学院长春应用化学研究所, 高分子物理与化学国家重点实验室, 长春 130022
  • 收稿日期:2000-11-15 出版日期:2002-06-24 发布日期:2002-06-24
  • 通讯作者: 傅 强(1963年出生),男,博士,教授,主要从事高分子物理、高分子成型加工和高分子增强增韧研究.E-mail:qiangfu@scu.edu.cn E-mail:qiangfu@scu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29704007);高分子物理与化学国家重点实验室基金资助

Non-isothermal Crystallization Behavior and Kinetics of Metallocene Short Chain Branched Polyethylene

PENG Ya1, FU Qiang1, LIU Jie-Ping2, HE Tian-Bai2   

  1. 1. Department of Polymer Science & Materials, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu1006 China;
    2. Changchun Institute of Applied Chemistry, State Key Laboratory of Polymer Physics and Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2000-11-15 Online:2002-06-24 Published:2002-06-24

摘要: 为探索分子量和支链含量对聚乙烯非等温结晶过程的影响,选用3组样品:(1)不同分子量的无支链线形聚乙烯;(2)低分子量的支链含量不同的试样;(3)高分子量的支链含量不同的试样.用DSC研究了这3组样品的非等温结晶动力学.结果表明:(1)与支链含量相比,分子量大小对结晶的影响是次要的,但高分子量样品的结晶度比低分子量样品低;(2)支链对聚乙烯的非等温结晶有重要影响,在支化聚乙烯中起决定作用;(3)无论是高分子量试样还是低分子量试样,支化含量增加,聚乙烯的结晶温度、结晶度、结晶动力学以及晶体的熔点等显著降低.

关键词: 茂金属聚乙烯, 非等温结晶, 分子量, 支链含量

Abstract: The non isothermal crystallization behavior and kinetics of metallocene short chain branched polyethylene were investigated via DSCat cooling rates from 2.5 to 20 ℃/min, and subsequent heating at rate of 10 ℃/min. To verify the effect of molecular weight and branching content on crystallization, three group samples were chosen: (1) linear polyethylene with low molecular weight and high molecular weight; (2) low molecular weight polyethylene with low branching content and high branching content; (3) high molecular weight polyethylene with low branching content and high branching content. The results show that crystallization temperature, crystallinity, melting temperature and crystallization rate are highly branching content dependent. Molecular weight effect is less important, compared to branching content. Adramatic decrease of crystallization temperature, crystallinity, crystallization rate and melting temperature was observed for branched samples. The non isothermal kinetics was analyzed via the methods developed by Gupta and Mo Zhi shen, and good agreement was obtained.

Key words: Metallocene short branched polyethylene, Non-isothermal crystallization, Molecular weight, Branching content

中图分类号: 

TrendMD: