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

POLYMER

卷:113

Article

Bernardo, P.¹  Bazzarelli, F.¹  Tasselli, F.¹  Clarizia, G.¹  Mason, C. R.²  Maynard-Atem, L.²  Budd, P. M.²  Lanc, M.³  Pilnacek, K.³  Vopicka, O.³  Friess, K.³  Fritsch, D.⁴  Yampolskii, Yu. P.⁵  Shantarovich, V.⁶  Jansen, J. C.¹ 

[1] CNR, Inst Membrane Technol ITM, Via P Bucci 17C, I-87036 Arcavacata Di Rende, CS, Italy

[2] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England

[3] Univ Chem & Technol, Dept Phys Chem, Tech 5, Prague 16628 6, Czech Republic

[4] Fraunhofer Inst Angew Polymerforsch IAP, Geiselbergstr 69, D-14476 Potsdam, Germany

[5] AV Topchiev Inst Petrochem Synth, 29 Leninsky Prospect, Moscow 119991, Russia

[6] NN Semenov Inst Chem Phys, 4 Kosygina Str, Moscow, Russia

关键词: PIM-1 membranes;    Physical aging;    Gas permeability;    Gas sorption;    Carbon dioxide;   

DOI  :  10.1016/j.polymer.2016.10.040

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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