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首页> 外文期刊>Journal of Applied Polymer Science >FREE VOLUME MODEL AND DIFFUSION OF ORGANIC SOLVENTS IN NATURAL RUBBER
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FREE VOLUME MODEL AND DIFFUSION OF ORGANIC SOLVENTS IN NATURAL RUBBER

机译：天然橡胶中的自由体积模型和有机溶剂的扩散

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摘要

The concentration dependence of the diffusion coefficients and the equilibrium isotherms of benzene, o-xylene, ethylbenzene, and chloroform in natural rubber membranes at 303 K were experimentally determined. The data were used to critically test the predictive capability of the Vrentas-Duda free volume model. It was found that although the model works well for some polymer-solvent systems such as toluene-polystyrene, the use of some of the parameters from pure component properties yields unacceptably low diffusion rates for the rubber-solvent systems studied. The parameters D-ol,1 and xi obtained from experimental zero-concentration diffusivity data, and parameter (V) over cap(1)* calculated from the solvent molecular geometries are needed to achieve good predictions. The diffusion coefficients described by the revised model can be used to predict quite well the breakthrough times of the rubber-solvent systems that were also experimentally measured by a permeation method. (C) 1995 John Wiley and Sons, Inc. [References: 9]
机译：实验确定了303 K下天然橡胶膜中苯，邻二甲苯，乙苯和氯仿的扩散系数的浓度依赖性和平衡等温线。数据用于严格测试Vrentas-Duda自由体积模型的预测能力。已经发现，尽管该模型对于某些聚合物-溶剂体系（例如甲苯-聚苯乙烯）非常有效，但是使用纯组分性质的某些参数对于所研究的橡胶-溶剂体系却产生了令人无法接受的低扩散速率。从实验零浓度扩散率数据获得的参数D-ol，1和xi，以及从溶剂分子的几何形状计算出的cap（1）*上的参数（V）才能获得良好的预测。修改后的模型描述的扩散系数可用于很好地预测橡胶-溶剂体系的突破时间，该时间也可以通过渗透法进行实验测量。 （C）1995 John Wiley and Sons，Inc. [参考：9]

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