聚合物
吸附
膜
范德瓦尔斯力
渗透
多孔性
多孔介质
材料科学
分子
扩散
合成膜
磁导率
气体扩散
气体分离
化学工程
传质
溶解度
高分子化学
热力学
化学物理
化学
有机化学
色谱法
复合材料
吸附
燃料电池
物理
工程类
生物化学
标识
DOI:10.1002/9781119112747.ch1
摘要
Virtually all the membrane processes realized for separation of gases and vapors employ non-porous polymeric membranes. The solution–diffusion mechanism provides an overall principle of the mass transfer through non-porous polymer membranes. However, in depth understanding of the mechanism of gas transport is impossible without more detailed, desirably atomistic models of what occurs when gas molecules are dissolved in polymers and diffuse through polymer films or membranes. Two approaches can serve for this aim: transition-state model and free volume model Gas sorption is the driving force of transport in non-porous polymer membranes, so thermodynamics of gas sorption in polymers is very important issue. When the concentration of dissolved penetrants in a polymer is low, they only weakly influence the properties of the polymer matrix. The solubility coefficients in the absence of specific interactions between the diffusing molecules and polymer matrix are determined by the van der Waals interactions.
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