高等学校化学学报

高等学校化学学报 ›› 2006, Vol. 27 ›› Issue (2): 365.

• 研究论文 • 上一篇    下一篇

HDPE等温结晶中液-固转变的流变特性

陈青1,2, 范毓润1, 李文春2, 郑强2   

  1. 1. 浙江大学流体传动及控制国家重点实验室;
     2. 浙江大学高分子科学与工程学系, 杭州 310027
  • 收稿日期:2005-02-21 出版日期:2006-02-10 发布日期:2006-02-10
  • 通讯作者: 郑强(1960年出生),男,教授,博士生导师,主要从事聚合物流变学研究.E-mail: zhengqiang@zju.edu.cn 范毓润(1948年出生),男,教授,博士生导师,主要从事流体力学、流变学研究. E-mail: yurunfan@zju.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20274041)及国家杰出青年基金(批准号: 50125312)资助

Rheological Properties of Liquid-solid Transition in Isothermal Crystallization for High-density Polyethylene

 CHEN Qing 1,2,   FAN Yu-Run1,   LI Wen-Chun2,   ZHENG Qiang2   

  1. 1.  State Key Laboratory of Fluid Power Control and Transmission; 
    2.  Department of Polymer Science and Engineering,  Zhejiang University,   Hangzhou 310027,  China
  • Received:2005-02-21 Online:2006-02-10 Published:2006-02-10
  • Contact: Zheng-Qiang,E-mail: zhengqiang@zju.edu.cn ;FAN Yu-Run,E-mail: yurunfan@zju.edu.cn

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被引次数

32

摘要：

摘要研究了高密度聚乙烯(HDPE)等温结晶过程中液-固转变的流变行为. 发现在等温结晶过程中, 旋转流变仪的平行板上会产生法向拉应力; 在结晶初期, 此应力会快速松弛; 一定时间后, 呈现出积聚并迅速增加的现象. 针对此现象提出了一种新的静态测试方法, 即利用由结晶导致的体积收缩测量法向拉力. 对动态测试和静态测试方法下的流变行为进行比较发现, 动态测试适用于结晶速率较慢的体系, 而静态测试则适用于结晶速率较快的体系. 相对于前者而言, 后者具有不干扰被测试样结晶行为的优点.

关键词: 关键词高密度聚乙烯; 等温结晶; 液-固转变; 流变特性

Abstract:

AbstractThe rheological properties of liquid-solid transition during the crystallization for high-density polyethylene(HDPE) was investigated through the static and dynamic rheological measurements.  It is found that with the crystallization proceeding,  a tensile force upon the parallel-plates is induced by volume  contraction of the sample.  In the case of static test with the motionless parallel plates,  this tensile force relaxes quickly in liquid states,  while starts to accumulate after certain time.  Accordingly,  a new method to determine the liquid-solid transition depending on the static tensile force is proposed.  A comparison between it and the classic dynamic one for detecting liquid\|solid transition evidences that the dynamic method is preferred to slow crystallization,  and static method is more appropriate for the crystallization at moderate rates.  Furthermore,  the latter has the advantage of no disturbing the crystallization behavior of HDPE before the transition.

Key words: KeywordsHigh-density polyethylene; Isothermal crystallization;  Liquid-solid transition;  Rheological property

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