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Effect of Brij98 on Durability of Silver Polymer Electrolyte Membranes for Facilitated Olefin Transport  

Kang, Yong-Soo (Division of Chemical Engineering, Hanyang University)
Kim, Jong-Hak (Department of Chemical Engineering Yonsei University)
Park, Bye-Hun (Division of Chemical Engineering, Hanyang University)
Won, Jong-Ok (Department of Applied Chemistry, Sejong University)
Publication Information
Membrane Journal / v.16, no.4, 2006 , pp. 294-302 More about this Journal
Abstract
Silver polymer electrolytes are very promising membrane materials for the separation of olefin/paraffn mixtures. Olefin molecules are known to be transported through reversible complex formation with silver ions entrapped iii polymer matrix. However, they have poor long-term stability, which is very important fur the industrial application; the selectivity through the membrane decreases gradually with time mostly due to the reduction of silver ions ($Ag^+$) into silver nanoparticles ($Ag^0$). In this study, the stability of silver polymer electrolyte was investigated for poly(vinyl pyrrolidone) (PVP) and $AgBF_4$ system containing a surfactant, i.e. $C_{18}H_{35}(OCH_2CH_2)_{20}OH$ (Brij98) as a stabilizer. The reduction behavior of silver ions to silver nanoparticles in PVP was also investigated by atomic force microscopy (AFM) and UV-visible spectroscopy. It was found that the growth of silver nanoparticles was slower and selectivity of polymer electrolyte for propylene in propylene/propane was maintained longer time when Brij98 was added as a stabilizer.
Keywords
facilitated olefin transport; polymer electrolyte; membrane stability; silver; surfactant;
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