Evaluation of proton conductivity of sulfonated polyimide/dihydroxy naphthalene charge-transfer complex hybrid membranes

Liana Christiani, Sandra Hilaire, Kazunari Sasaki, Masamichi Nishihara

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Sulfonated polyimide (SPI)/dihydroxynaphthalene (DHN) charge-transfer (CT) complex hybrid films were investigated as possible alternative for polymer electrolyte membranes in polymer electrolyte fuel cells. SPI/DHN CT complex hybrid films include CT complexes, which might work as electronic conductors, and sulfonic acid units, which could work as proton conductors. Therefore, the origin of the conductivity of SPI/DHN complex hybrid films was evaluated by four-probe impedance measurements in the through-plane direction of the films. The obtained conductivity of the CT complex hybrid films increased with the increase of ion exchange capacity of the CT films and the decrease of CT complex concentration in the films. These results indicated that proton transfer dominantly occurred in the CT complex hybrid films. Proton conductivity of the CT complex hybrid films consisting of 2,6- or 1,5-DHN showed the similar values, although the molecular geometries of the CT complex were different. The activation energy values for proton conductivity in the CT films were approximately the same as that of Nafion 212. Water uptake (WU) results were also conducted and suggest that CT complex formation could control the degree of WU of the films and prevent dissolution of SPI.

Original languageEnglish
Pages (from-to)2991-2997
Number of pages7
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume52
Issue number20
DOIs
Publication statusPublished - Oct 15 2014

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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