Ionic interaction behavior and facilitated olefin transport in poly(N-vinyl pyrrolidone):Silver triflate electrolytes; effect of molecular weight

Jong Hak Kim, Byoung Ryul Min, Chang Kon Kim, Jongok Won, Yong Soo Kang

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Interactions of cation/anion and cation/polymer in poly(N-vinyl pyrrolidone) (PVP):silver triflate (AgCF3SO3) electrolytes with different weight-average molecular weights (Mw's) of 1 × 106 (1 M), 3.6 × 105 (360 K), 4 × 104 (40 K), and 1 × 104 (10 K) have been studied with IR and Raman spectroscopies. According to the change of the C = O peak, coordination of silver ions by C = O in a low Mw (10 or 40 K) PVP matrix tend to be always thermodynamically favorable than high Mw (1 M or 360 K) PVP, demonstrating that the polymer matrix of low Mw dissolves silver salts more effectively. In addition, silver cations interact with both larger SO3- and smaller CF3 to form ion pairs, and the former interaction is stronger than the latter in a monomer or low Mw polymer matrix (40 K, 10 K), as demonstrated by theoretical ab initio calculation or experimental spectroscopy, respectively. However, CF3 interacts more favorably with silver cation than SO3- in high Mw (1 M and 360 K) PVP, which is ascribed to the steric effect of the bulky SO3- anion by highly entangled polymer chains. Despite the superior dissolving property of the low Mw polymer matrix, the membranes consisting of low Mw PVP and AgCF3SO3 exhibited poor separation performance for propylene/propane mixtures in comparison with those of high Mw, presumably because of the poor mechanical property for membrane formation in low Mw PVP.

Original languageEnglish
Pages (from-to)1813-1820
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume40
Issue number17
DOIs
Publication statusPublished - 2002 Sep 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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