The Thermodynamics of Gas Sorption in Glassy Polymers

气体混合物的分离是一个很大的问题。 工业意义。 聚合物材料的最新进展 技术导致越来越多地使用 这些分离的膜。 不同的聚合物 对于给定的分离，通常通过以下方法来评价材料 测量气体吸附等温线和扩散系数。 通常，获得的吸附数据是用 双模式模式。 虽然这种模式已被证明是有用的， 实践中，它在很大程度上是经验性的，不 直接将吸附性能与其它材料相关联 特性. 该项目是一项研究气体的吸附， 从热力学的角度来看，玻璃状聚合物。 一 气体吸附热力学的理论框架 在玻璃状聚合物中将被建立。 吸附热 将通过实验测量并用于验证 理论结果。 初步结果显示， 吸附、机械性能和 有助于筛选材料的混合热 用于气体分离。 结果与双 模式模型允许解释某些双模 力学和热力学参数 特性.

The separation of gas mixtures is a problem of great industrial significance. Recent advances in polymeric technology have led to an increasingly greater use of membranes for these separations. Different polymeric materials are commonly evaluated for a given separation by measuring gas sorption isotherms and diffusion coefficients. Frequently, the sorption data obtained is interpreted using the dual mode model. While this model has proved useful in practice, it is largely empirical in nature and does not directly relate sorption properties to other material properties. This project is an investigation of the sorption of gases in glassy polymers from a thermodynamic point of view. A theoretical framework for the thermodynamics of gas sorption in glassy polymers will be established. Heats of sorption will be measured experimentally and used to validate the theoretical results. Preliminary results suggest a relationship between sorption, mechanical properties, and the heat of mixing which might aid in the screening of materials for gas separation. A comparison of the results to the dual mode model allows an interpretation of certain dual mode parameters in terms of mechanical and thermodynamic properties.