Influence of chemical composition and sequence length on the transport properties of proton exchange membranes

Journal of Polymer Science, Part B: Polymer Physics - Tập 44 Số 16 - Trang 2226-2239 - 2006
Abhishek Roy1,2, Michael A. Hickner3, Xiang Yu1,2, Yanxiang Li1,2, Thomas E. Glass1,2, James E. McGrath1,2
1Macromolecules and Interfaces Institute
2Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
3Chemical and Biological Systems Department, Sandia National Laboratories, Albuquerque, New Mexico 87185

Tóm tắt

AbstractOne of the integral parts of the fuel cell is the proton exchange membrane. Our research group has been engaged in the past few years in the synthesis of several sulfonated poly(arylene ether) random copolymers. The copolymers were varied in both the bisphenol structure as well as in the functional groups in the backbone such as sulfone and ketones. To compare the effect of sequence length, multiblock copolymers based on poly(arylene ether sulfone)s were synthesized. This paper aims to describe our investigation of the effect of chemical composition, morphology, and ion exchange capacity (IEC) on the transport properties of proton conducting membranes. The key properties examined were proton conductivity, methanol permeability, and water self diffusion coefficient in the membranes. It was observed that under fully hydrated conditions, proton conductivity for both random and block copolymers was a function of IEC and water uptake. However, under partially hydrated conditions, the block copolymers showed improved proton conductivity over the random copolymers. The proton conductivity for the block copolymer series was found to increase with increasing block lengths under partially hydrated conditions. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2226–2239, 2006

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Thông tin xuất bản

Journal of Polymer Science, Part B: Polymer Physics

Tập 44 Số 16

2226-2239

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