Synthesis and properties of fluorine- and siloxane-containing polybenzimidazoles for high temperature proton exchange membrane fuel cells

Lien-Chung Hsu, Yung Chung Lin, Tsung Yu Tasi, Li Cheng Jheng, Cheng Hsun Shen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this study, new fluorine-siloxane-containing polybenzimidazole (PBI) copolymers were synthesized by copolymerization of 3,3'-diaminobenzidine, 2,2-bis(4-carboxyphenyl)-hexafluoropropane (HFA), and 1,3 bis(carboxypropyl) tetramethyldisiloxane (BTMDS) with different molar ratios. PBI copolymer membranes were prepared by solution-casting and then doped with phosphoric acid. The structures of PBI copolymers were characterized by FTIR and X-ray diffraction. The solubility of the PBI copolymers was significantly increased by the introduction of the bulky HFA group and the flexible BTMDS group into the polymer backbone. The PBI copolymers still maintained good thermal stability and mechanical properties. Because of the introduction of the flexible and hydrophobic siloxane group in the polymer backbone, the methanol permeability was reduced and the proton conductivity under anhydrous condition at high temperatures was increased compared to the PBI without the siloxane group.

Original languageEnglish
Pages (from-to)4107-4112
Number of pages6
JournalJournal of Applied Polymer Science
Volume130
Issue number6
DOIs
Publication statusPublished - 2013 Dec 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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