The Thermodynamics of Gas Sorption in Glassy Polymers

玻璃态聚合物中气体吸附的热力学

• 批准号: 9011207
• 负责人: G. Glenn Lipscomb
• 金额: --
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-11-01 至 1994-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9011207&HistoricalAwards=false
• 关键词: Thermodynamics; Gas; Sorption; Glassy; Polymers

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.

气体混合物的分离是一个具有重大工业意义的问题。 聚合物技术的最新进展导致越来越多地使用膜进行这些分离。 通常通过测量气体吸附等温线和扩散系数来评估不同聚合物材料的给定分离。 通常，使用双模式模型解释获得的吸附数据。 虽然该模型在实践中被证明是有用的，但它本质上很大程度上是经验性的，并且不直接将吸附特性与其他材料特性联系起来。 该项目是从热力学角度研究玻璃状聚合物中气体的吸附。 将建立玻璃态聚合物中气体吸附热力学的理论框架。 吸附热将通过实验测量并用于验证理论结果。 初步结果表明吸附、机械性能和混合热之间存在关系，这可能有助于筛选用于气体分离的材料。 将结果与双模式模型进行比较，可以根据机械和热力学性质解释某些双模式参数。