Olefin Separation Performances and Coordination Behaviors of Facilitated Transport Membranes Based on Poly(styrene-b-isoprene-b-styrene)/Silver Salt Complexes

Solid-state facilitated, olefin transport membranes were prepared by complexation of poly(styrene- b -isoprene- b -styrene) (SIS) block copolymer and silver salt. Facilitated olefin transport was not observed up to a silver mole fraction of 0.14, representing a threshold concentration, above which t...

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Veröffentlicht in:Macromolecular research 2009, 17(2), , pp.104-109
Hauptverfasser: Lee, Dong Hoon, Kang, Yong Soo, Kim, Jong Hak
Format: Artikel
Sprache:eng
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Zusammenfassung:Solid-state facilitated, olefin transport membranes were prepared by complexation of poly(styrene- b -isoprene- b -styrene) (SIS) block copolymer and silver salt. Facilitated olefin transport was not observed up to a silver mole fraction of 0.14, representing a threshold concentration, above which transport increased almost linearly with increasing silver salt concentration. This was because firstly the silver ions were selectively coordinated with the C=C bonds of PI blocks up to a silver mole fraction of 0.20, and secondly the coordinative interaction of the silver ions with the aliphatic C=C bond was stronger than that with the aromatic C=C bond, as confirmed by FT-Raman spectroscopy. Small angle X-ray scattering (SAXS) analysis showed that the cylindrical morphology of the neat SIS block copolymer was changed to a disordered structure at low silver concentrations (0.01∼0.02). However, at intermediate silver concentrations (0.15∼0.20), disordered-ordered structural changes occurred and finally returned to a disordered structure again at higher silver concentrations (>0.33). These results demonstrated that the facilitated olefin transport of SIS/silver salt complex membranes was significantly affected by their coordinative interactions and nano-structural morphology.
ISSN:1598-5032
2092-7673
DOI:10.1007/BF03218662