Synthesis and properties of fluorine-containing polybenzimidazole/montmorillonite nanocomposite membranes for direct methanol fuel cell applications

Shih Wei Chuang, Lien-Chung Hsu, Chiao Ling Hsu

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Novel polybenzimidazole (PBI)/montmorillonite (MMT) nanocomposite membranes were prepared from an organosoluble, fluorine-containing PBI with an organically modified MMT (m-MMT) clay. Both wide angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM) analyses showed that the m-MMT was well dispersed in the PBI matrix on a nanometer scale. The thermooxidative stability of PBI membranes increased slightly with the increase of m-MMT content. The coefficients of the thermal expansion (CTE) of PBI/7 wt% m-MMT nanocomposite membranes were decreased by 30% relative to that of pure PBI. The mechanical properties and the methanol barrier ability of the PBI films were significantly improved by the addition of m-MMT. The tensile modulus of PBI/5 wt% m-MMT nanocomposite membranes had a 41% increase compared to the pure PBI films. The m-MMT in the phosphoric acid-doped PBI could effectively inhibit the plasticizing effect of the phosphoric acid. The methanol permeability of the PBI/5 wt% m-MMT nanocomposite membrane decreased by approximately 81% with respect to the pure PBI membranes. The conductivity of the acid-doped PBI/m-MMT nanocomposites was slightly lower than the acid-doped pure PBI.

Original languageEnglish
Pages (from-to)172-177
Number of pages6
JournalJournal of Power Sources
Volume168
Issue number1 SPEC. ISS.
DOIs
Publication statusPublished - 2007 May 25

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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