高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (1): 191.

• 研究简报 • 上一篇    下一篇

等规聚丙烯自成核的等温结晶动力学

王松, 杨德才   

  1. 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:2002-11-04 出版日期:2004-01-24 发布日期:2004-01-24
  • 通讯作者: 杨德才(1940年出生),男,研究员,博士生导师,主要从事高分子凝聚态结构研究.E-mail:dcyang@ciac.jl.cn E-mail:dcyang@ciac.jl.cn
  • 基金资助:

    国家重大基础研究发展规划项目(批准号:G1999064805)资助

Isothermal Crystallization Kinetics of iPP During Self-nucleation Process

WANG Song, YANG De-Cai   

  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2002-11-04 Online:2004-01-24 Published:2004-01-24

关键词: 聚丙烯, 自成核, 结晶行为, 等温结晶动力学

Abstract: In this paper, the isothermal crystallization kinetics of polypropylene(iPP) during self-nucleation was studied by means of differential scanning calorimetry(DSC). The iPP was melted at 438 K and then isothermally crystallized in the range of temperature between 421 and 425 K. The mechanism of nucleation and growth of iPP was discussed. The Avrami equation was applied to analyzing the process of isothermal crystallization of iPP from the melt. The average value of Avrami exponent is n=3.01, suggesting that the primary crystallization maybe corresponds to three-dimensional spherulitic growth.The Kg value obtained from Lauritzen-Hoffman equation is 1.128×105 K2, which suggests that crystallization species should be regime Ⅱ. The decrease of crystallization active energy and chain folding work indicates that the self-nucleation can greatly promote the overall crystallization of iPP.

Key words: Polypropylene, Self-nucleation, Crystallization, Isothermal crystallization kinetics

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