Olefin separation performances and coordination behaviors of facilitated transport membranes based on poly(styrene-b-isoprene-b-styrene)/silver salt complexes

Dong Hoon Lee, Yong Soo Kang, Jong Hak Kim

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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.

Original languageEnglish
Pages (from-to)104-109
Number of pages6
JournalMacromolecular Research
Issue number2
Publication statusPublished - 2009 Jan 1


All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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