화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.16, No.8, 676-681, December, 2008
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Selective Coordination of Silver Ions to Poly(styrene-b-(ethylene-co-butylene)-bstyrene) and its Influence on Morphology and Facilitated Olefin Transport
Dong Hoon Lee, Yong Soo Kang†, Jong Hak Kim1, and Sang Wook Kang2
  • Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea
  • 1Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea
  • 2School of Chemical & Biological Engineering, Seoul National University, Seoul 151-744, Korea
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The π-complex membranes of poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS) of two silver salts of AgBF4 and AgCF3SO3 were prepared and tested for the separation of the propylene/propane mixtures. The Fouriertransform infrared (FT-IR) spectra of these complexes showed that the silver salts were dissolved in SEBS up to a silver mole fraction of 0.14, due to π-complexation between the aromatic C=C bonds of styrene blocks and silver ions. Above this solubility limit, ion pairs and high-order ionic aggregates began to form, so that silver salts were distributed unselectively in both the EB and PS blocks. The domain size of the PS blocks was enlarged up to this critical concentration with increasing silver concentration without structural transitions, as confirmed by small angle x-ray scattering (SAXS). These structural properties of the SEBS/silver salt complexes may explain the lower separation properties for propylene/propane mixtures compared to poly(styrene-b-butadiene-b-styrene)(SBS)/silver salt complex membranes.
Keywords:silver;facilitated transport;membrane;block copolymer;small angle x-ray scattering (SAXS).
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