物理化学学报 >> 1999, Vol. 15 >> Issue (03): 210-215.doi: 10.3866/PKU.WHXB19990304

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动态凝胶网络中的溶质扩散

刘红斌, 任延, 王宇新, 王世昌, 安英丽, 左榘   

  1. 天津大学化学工程研究所，天津 300072|南开大学吸附分离功能高分子材料国家重点实验室，天津 300071
  • 收稿日期:1998-06-04 修回日期:1998-07-09 发布日期:1999-03-15
  • 通讯作者:

Solute Diffusion in the Dynamic Network of Gel

Liu Hong-Bin, Ren Yan, Wang Yu-Xin, Wang Shi-Chang, An Ying-Li, Zuo Ju   

  1. Chemical Engineering Research Center,Tianjin University,Tianjin 300072|State Key Laboratory of Functional Polymer Materials for Adsorption and Separation,Insitute of Polymer Chemistry,Nankai University,Tianjin 300071
  • Received:1998-06-04 Revised:1998-07-09 Published:1999-03-15
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摘要：

从理论和实验两方面研究了凝胶网络中溶质的扩散. 着重于凝胶网络的涨落对扩散的影响, 以动态链渗流理论建立了凝胶动态网络中溶质扩散的数学模型. 制备了聚异丙基丙烯酰胺(PNIPA)水凝胶, 用激光光散射法测定了凝胶网络的涨落行为. 用双室膜池法以甲基蓝为溶质测定了凝胶中的扩散. 模型与实验结果定性相符.

关键词: 凝胶, 密度涨落, 渗流理论, 动态无规跳跃, 扩散

Abstract:

 A study was carried out both theoretically and experimentally on the solute diffusion in gel networks. The emphasis of this study was on the effect of network fluctuation. A model of diffusion was established based on the theory of dynamic disordered hopping, which was originally developed to describe the conduction of charged particles in polyelectrolyte. Temperature sensitive poly(n-isopropylacrylamide) gels were prepared and methyl blue was chosen as a solute for the diffusion experiment. Laser light scattering spectroscopy was used to study the dynamic behaviors of the gel network. Theoretical predictions agree qualitatively with the experimental results.

Key words: Gel, Density fluctuation, Percolation theory, Dynamic disordered hopping, Diffusion