Effect of structure on the temperature dependence of gas transport and sorption in a series of polycarbonates
Effect of structure on the temperature dependence of gas transport and sorption in a series of polycarbonates
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DOI：
10.1002/polb.1994.090320412
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发表时间：
1994-03
期刊：
影响因子：
--
通讯作者：
Lora M. Costello;W. Koros
中科院分区：
文献类型：
--
作者：
Lora M. Costello;W. Koros
报告了双酚A聚碳酸酯（PC）、四甲基聚碳酸酯（TMPC）和四甲基六氟聚碳酸酯（TMHFPC）在高达200°C的温度下对五种气体的渗透性和溶解性。的渗透选择性的温度依赖性进行了讨论的溶解度和扩散系数的选择性随温度的变化，CO2/CH 4和He/N2气体分离。还报道了三种聚碳酸酯中每种气体的渗透和扩散的活化能以及吸附热。这些值的分析提供了一个更好的基本理解的聚合物-渗透剂的相互作用和聚合物骨架结构上的温度依赖性的气体在膜分离过程中的传输和吸附性能的影响。影响溶解度和扩散率的重要因素，选择性的损失或收益与温度升高也确定通过这些数据与气体和聚合物的物理性质的相关性。这些结论提供了一个框架，选择最有前途的膜材料，在高温下特定的气体分离。John Wiley & Sons，Inc.
The permeabilities and solubilities of five gases are reported for bisphenol-A polycarbonate (PC), tetramethyl polycarbonate (TMPC), and tetramethyl hexafluoro polycarbonate (TMHFPC) at temperatures up to 200°C. The temperature dependence of permselectivity is discussed in terms of solubility and diffusivity selectivity changes with temperature for CO2/CH4 and He/N2 gas separations. The activation energies for permeation and diffusion and the heats of sorption are also reported for each gas in the three polycarbonates. Analysis of these values provides a better fundamental understanding of the effect of polymer-penetrant interactions and polymer backbone structure on the temperature dependence of the transport and sorption properties of gases in membrane separation processes. Important factors affecting the solubility and diffusivity selectivity losses or gains with increased temperature are also identified through correlation of these data with physical properties of the gases and polymers. These conclusions provide a framework for choosing the most promising membrane materials for particular gas separations at elevated temperatures. © 1994 John Wiley & Sons, Inc.