Selective Coordination of Silver Ions to Poly(styrene-b-(ethylene-co-butylene)-bstyrene) and its Influence on Morphology and Facilitated Olefin Transport

• Published in: Macromolecular research pp. 676 - 681
• Main Authors: 이동훈, 김종학, 강상욱, 강용수
• Format: Journal Article
• Language: English
• Published: 한국고분자학회 01.12.2008
• Subjects: 고분자공학
• ISSN: 1598-5032; 2092-7673

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 KCI Citation Count: 4