高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (11): 1763.

• 论文 • 上一篇    下一篇

用渗流理论计算高分子溶液中溶剂的自扩散系数

刘华, 蒋文华, 韩世钧   

  1. 浙江大学化学系, 杭州 310027
  • 收稿日期:1998-11-24 出版日期:1999-11-24 发布日期:1999-11-24
  • 通讯作者: 韩世钧
  • 作者简介:刘华,女,30岁,硕士.
  • 基金资助:

    国家自然科学基金(批准号:29676036)资助课题

Calculation of Solvent Self-diffusion Coefficient in Polymer Solution by Percolation Theory

LIU Hua, JIANG Wen-Hua, HAN Shi-Jun   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China
  • Received:1998-11-24 Online:1999-11-24 Published:1999-11-24

PDF (PC)

摘要： 基于微观渗流理论建立了溶剂小分子在高分子溶液中的自扩散模型,并据此模型对不同温度和浓度下的聚苯乙烯(PS)-苯、PS-甲苯、PS-乙苯和PS-四氢呋喃4个体系中小分子的自扩散系数进行了关联,计算出在不同温度下溶剂分子扩散所需的临界浓度。结果表明,在PS玻璃化温度以下,本模型对于温度和浓度具有很好的适用性和关联精度。

关键词: 自扩散系数, 高分子溶液, 渗流理论

Abstract: According to the percolation theory, a new model which is used to describe the solvent self diffusion in polymer solution has been established. The solvent self diffusion coefficient of PS-toluene, PS-benzene, PS-ethylbenzene and PS-THF systems has been correlated by using the new model at different temperatures and concentrations and the critical volume fraction of solvent self-diffusion at different temperatures has been estimated. The results show that below the glass temperature of PS, the new model not only has a satisfactory correlated accuracy, but it is suitable for a large range of temperature and concentration.

Key words: Self-diffusion coefficient, Polymer solution, Percolation theory

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