Sulfonated copolyimide membranes derived from a novel diamine monomer with pendant benzimidazole groups for fuel cells

Wei Li, Xiaoxia Guo, David Aili, Santiago Martin Fernandez, Qingfeng Li, Jianhua Fang

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Sulfonated polyimides are among the most interesting proton exchange membrane materials with high proton conductivity and good mechanical characteristics. As a major challenge the hydrolytic instability of the polymer backbone is addressed by introducing basic moieties in the polymer main chain. A series of sulfonated copolyimides (SPI) are prepared via random copolymerizatio of 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) with a new diamine monomer with pendant benzimidazole groups, 2,2'-bis(4-(1H-benzo[d]imidazol-2-yl)phenoxy)benzidine (BIPOB), and a sulfonated diamine monomer 4,4'-bis(4-aminophenoxy)biphenyl-3,3'-disulfonic acid (BAPBDS) at different diamine molar ratios (BAPBDS/BIPOB, 4/1, 6/1, 9/1 and 12/1). With ion exchange capacities in the range of 1.60-2.24 meq g(-1), transparent and ductile membranes are obtained by solution casting. The incorporation of benzimiclazole pendant groups significantly improves the hydrolytic stability as well as the radical oxidative stability of the membranes. In addition, the SPI membranes exhibit high proton conductivities of 0.1 S cm(-1) in the fully hydrated state at 60 degrees C and high elastic modulus and tensile strength. Preliminary fuel cell tests demonstrate the technical feasibility and stability of the materials. (C) 2015 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalJournal of Membrane Science
Volume481
Pages (from-to)44-53
Number of pages10
ISSN0376-7388
DOIs
Publication statusPublished - 2015

Keywords

  • ENGINEERING,
  • POLYMER
  • PROTON-EXCHANGE MEMBRANES
  • POLYMER ELECTROLYTE MEMBRANE
  • POLYIMIDE MEMBRANES
  • WATER STABILITY
  • HYDROLYTIC DEGRADATION
  • CONDUCTING MEMBRANES
  • ACID
  • POLYBENZIMIDAZOLE
  • POLYELECTROLYTES
  • TRANSPORT
  • Sulfonated polyimide
  • Proton exchange membrane fuel cell
  • Radical oxidative stability
  • Hydrolytic stability
  • Amines
  • Fuel cells
  • Ion exchange
  • Ion exchange membranes
  • Mechanical properties
  • Membranes
  • Monomers
  • Oxidation resistance
  • Polyimides
  • Proton conductivity
  • Stability
  • Tensile strength
  • High elastic modulus
  • Ion exchange capacity
  • Mechanical characteristics
  • Proton exchange membranes
  • Sulfonated copolyimide
  • Sulfonated polyimides
  • Proton exchange membrane fuel cells (PEMFC)

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