摘要
基于双重式吸着概念，将气体在玻璃态高分子膜中的吸着过程理解为溶解和多分子层吸附两个同时发生的过程，将溶解过程理想化，并结合多分子层吸附的ＢＥＴ方程，导出了纯气体在均质高分子膜中的吸着时改进的双重式吸着模型，用文献中报导的ＰＡＮ—Ｈ２Ｏ的实验数据对模型进行了分析和验证，结果表明该模型不仅可用来解释纯气体在玻璃态高分子膜吸着时的各种现象，对纯气体在橡胶态膜中偏离亨利定律的溶解过程也能给予较好的描述。
Sorption Mechanism of pure gases in a homogenous polymer membrane was studied.Based on the concept of the dual-mode sorption model, gas sorption in a glassy polymermembrane can be interpretal as two concurrent processes: (a) an ordinary dissolution in thehomogenous region and (b) a multi-layered molede adsorption in the microcavities. Byidealizing the ordinary dissolution in a polymer membrane as that in solution, a modifieddual-mode sorption model was derived for pure gases in glassy polymer membranes withthe combination of BET equation. The derived model was verifried by the experimental data asreported in the literature. The result showed very consistent between the theoretical and theexperimental. With the consideration of both the multi-layeds molecule adsorption and theeffect of the dissolved concentration on solubility coefficient, i.e., the interaction between gas andpolymer, the derived model is capable of describing the sorption of gases both in a glassypolymer membrane and in a rubber one which Henry's law is not obeyed.
基金
中国博士后基金
关键词
均质
高分子膜
双重式
气体
膜分离
吸着机理
:Homogenous polymer membrane Dual--mode sorption Multi--layered moleculesorption
