Synthesis and characterization of grafted/crosslinked proton conducting membranes based on amphiphilic pvdf copolymer

Dong Kyu Roh, Sung Hoon Ahn, Jin Ah Seo, Yong Gun Shul, Jong Hak Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A novel graft copolymer consisting of a poly(vinylidene fluoride-co-chlorotrifluoroethylene) backbone and poly (glycidyl methacrylate) side chains, that is, P(VDF-co-CTFE)-g- PGMA, was synthesized through atom transfer radical polymerization (ATRP) using CTFE units as a macroinitiator. Successful synthesis and microphase-separated structure of the polymer were confirmed by 1H NMR, FTIR spectroscopy, and TEM. Assynthesized P(VDF-co-CTFE)-g-PGMA copolymer was sulfonated by sodium bisulfite, followed by thermal crosslinking with sulfosuccinic acid (SA) via the esterification to produce grafted/crosslinked polymer electrolyte membranes. The IEC values continuously increased with increasing SA content but water uptake increased with SA content up to 10 wt %, above which it decreased again as a result of competitive effect between crosslinking and hydrophilicity of membranes. At 20 wt % of SA content, the proton conductivity reached 0.057 and 0.11 S/cm at 20 and 80°C, respectively. The grafted/crosslinked P(VDF-co-CTFE)- g-PGMA/SA membranes exhibited good mechanical properties (>400 MPa of Youngs modulus) and high thermal stability (up to 300°C), as determined by a universal testing machine (UTM) and TGA, respectively.

Original languageEnglish
Pages (from-to)1110-1117
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume48
Issue number10
DOIs
Publication statusPublished - 2010 May 15

All Science Journal Classification (ASJC) codes

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

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