Propylene-induced plasticization in silver polymer electrolyte membranes

Dongkyun Ko; Jong Hak Kim; Sang Wook Kang; Dong Hoon Lee; Jongok Won; Yong Soo Kang

Journal of Industrial and Engineering Chemistry, Vol.15, No.1, 8-11, January, 2009

DOI10.1016/j.jiec.2008.08.009 Export Citation

Propylene-induced plasticization in silver polymer electrolyte membranes

Dongkyun Ko, Jong Hak Kim^{1, †}, Sang Wook Kang², Dong Hoon Lee, Jongok Won³, and Yong Soo Kang^†

Department of Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea
¹Department of Chemical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
²School of Chemical & Biological Engineering, Seoul National University, Seoul 151-744, South Korea
³Department of Applied Chemistry, Sejong University, Seoul 143-747, South Korea

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Silver polymer electrolyte membranes consisting of AgBF4 or AgCF3SO3 dissolved in poly(2-ethyl-2-oxazoline) (POZ) or poly(N-vinyl pyrrolidone) (PVP) have previously shown outstanding separation performance for propylene/propane mixtures. The ideal separation factor (i.e. pure gas selectivity) of propylene over propane reached 15,000, but the actual selectivity (i.e. mixed gas selectivity) was approximately 50. In this study, the origin of large difference between pure and mixed gas selectivities has been elucidated in terms of membrane plasticization by propylene molecules. The membrane plasticization was confirmed by the decrease of selectivity with increasing propylene concentration in the feed, resulting from the increase of both propylene and propane permeances. The decrease of glass transition temperature (Tg) in silver polymer electrolytes upon the sorption of propylene also supported the membrane plasticization, determined by in situ high-pressure differential scanning calorimetry (HPDSC). Further analysis of configuration entropy model revealed that the interaction of propylene/silver ion in POZ/AgBF4 was approximately 2-fold stronger than that in POZ/AgCF3SO3, which is in good agreement with the results of propylene solubility and FT-IR spectra.

Keywords:Plasticization;Silver;Propylene;Facilitated transport;High-pressure differential scanning;calorimetry

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