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Effect of physical aging on the gas transport and sorption in PIM-1 membranes

 
: Bernardo, P.; Bazzarelli, E.; Tasselli, F.; Clarizia, G.; Mason, CR.; Maynard-Atem, L.; Budd, P.M.; Lanc, M.; Pilnacek, K.; Vopicka, O.; Friess, K.; Fritsch, D.; Yampolskii, Y.P.; Shantarovich, V.; Jansen, J.C.

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Polymer 113 (2017), pp.283-294
ISSN: 0032-3861
European Commission EC
FP7; 228631; DOUBLENANOMEM
Nanocomposite and Nanostructured Polymeric Membranes for Gas and Vapour Separations
European Commission EC
608490; M4CO2
Energy efficient MOF-based Mixed Matrix Membranes for CO2 Capture
English
Journal Article
Fraunhofer IAP ()

Abstract
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.

: http://publica.fraunhofer.de/documents/N-480774.html