Modeling solute diffusion in aqueous polymer solutions
Modeling solute diffusion in aqueous polymer solutions
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DOI：
10.1016/s0032-3861(01)00749-2
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发表时间：
2002-03-01
期刊：
影响因子：
4.6
通讯作者：
Amsden, B
中科院分区：
文献类型：
--
作者：
Amsden, B
有许多模型描述溶质在聚合物溶液中的扩散。对这些模型的分析表明，没有一个模型可以为观察到的溶质现象提供一致的解释，因为溶质本质上可以被建模为固体球体，因此，提出了一个基于物理障碍方法的新模型。在这个模型中，假设溶质分子在聚合物链存在下的运动是由溶质分子在链之间遇到一系列大于其流体动力学半径的开口的概率所控制的。该模型对从文献中获取的一系列聚合物溶液和溶质探针的数据进行了测试，发现溶质尺寸、聚合物浓度和聚合物柔韧性的影响非常一致。(C) 2002年Elsevier Science Ltd.出版
There are numerous models describing solute diffusion in polymer solutions. An analysis of these models demonstrates that none can provide a consistent explanation of the phenomenon observed for solutes that can be modeled as essentially solid spheres, For this reason, a new model based on a physical obstruction approach is presented. In this model, solute movement in the presence of polymer chains is assumed to be governed by the probability of the solute molecule encountering a series of openings between the chains larger than its hydrodynamic radius. The model is tested against data taken from the literature for a series of polymer solutions and solute probes and found to provide good agreement to the effects of solute size, polymer concentration, and polymer flexibility. (C) 2002 Published by Elsevier Science Ltd.