Effect of physical aging on the gas transport and sorption in PIM-1 membranes
Effect of physical aging on the gas transport and sorption in PIM-1 membranes
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DOI：
10.1016/j.polymer.2016.10.040
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发表时间：
2017-03-24
期刊：
影响因子：
4.6
通讯作者：
Jansen, J. C.
中科院分区：
文献类型：
--
作者：
Bernardo, P.;Bazzarelli, F.;Jansen, J. C.
了解长时间尺度上的性能是成功应用新型聚合物作为膜材料的关键要求。在这种情况下，物理老化的致密PIM-1膜与不同的先前的历史监测超过4年，通过并行的气体吸附和渗透性测量。老化的影响上的个人的传输参数，渗透性，溶解度和扩散性，研究了醇处理的膜具有高过量自由体积。这些膜的热调节导致加速老化和膜的初始气体渗透性和扩散性的降低。一个长期的CO2吸附分析表明，老化影响的吸附动力学比总的平衡吸附。这是证实了与六种不同的气体的渗透研究，表明样品的渗透系数作为时间的函数的减少几乎完全是由于扩散系数的减少。一个新的酒精处理的老化膜导致显着的再生膜。据我们所知，这是第一个系统的长期老化研究PIM-1通过同时分析吸附和渗透动力学。用CO2/CH 4混合物和N-2/O-2/CO2混合物的混合气体渗透测量证实了PIM-1膜即使在长时间老化后也具有优异的选择性渗透性能。(C)2017由Elsevier Ltd.出版
Understanding of the properties over long time scales is a key requirement for the successful application of novel polymers as membrane materials. In this light, the physical aging of dense PIM-1 films with different previous histories was monitored for more than 4 years via parallel gas sorption and permeability measurements. The effect of aging on the individual transport parameters, permeability, solubility and diffusivity, was studied on alcohol treated membranes with high excess free volume. Thermal conditioning of these membranes led to accelerated aging and a reduction of the initial gas permeability and diffusivity of the membranes. A long-term CO2 sorption analysis showed aging affected the sorption kinetics much more than the total equilibrium sorption. This was confirmed by permeation studies with six different gases, showing that the reduction of the permeability coefficient of the samples as a function of time is almost entirely due to a reduction of the diffusion coefficient. A renewed alcohol treatment of the aged membrane led to significant rejuvenation of the membrane. To the best of our knowledge, this is the first systematic long term aging study on PIM-1 via simultaneous analysis of sorption and permeation kinetics. Mixed gas permeation measurements with a CO2/CH4 mixture and an N-2/O-2/CO2 mixture confirm the excellent permselective properties of the PIM-1 membranes even after long aging. (C) 2017 Published by Elsevier Ltd.