Naphthalene-based poly(arylene ether ketone) copolymers containing sulfobutyl pendant groups for proton exchange membranes

Ke Shao, Jing Zhu, Chengji Zhao, Xianfeng Li, Zhiming Cui, Yang Zhang, Hongtao Li, Dan Xu, Gang Zhang, Tiezhu Fu, Wu Jing, Hui Na, Wei Xing

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Abstract

A new monomer 1,5-bis(4-fluorobenzoyl)-2,6-dimethoxynaphthalene (DMNF) was prepared and further polymerized to form naphthalene-based poly(arylene ether ketone) copolymers containing methoxy groups (MNPAEKs). The side-chain-type sulfonated naphthalene-based poly(arylene ether ketone) copolymers (SNPAEKs) were obtained by demethylation and sulfobutylation. Flexible and tough membranes with reasonably high mechanical strength were prepared. The SNPAEKs membrane showed anisotropic membrane swelling with larger swelling in thickness than in plane. Transmission electron microscopy (TEM) analysis revealed clear nanophase separated structure of SNPAEKs membranes, which composed of hydrophilic side chain and hydrophobic main-chain domains. Proton conductivities of copolymers increased gradually with increase in temperature. The highest conductivity of 0.179 S/cm was obtained for SNPAEK-80 (IEC = 1.82 mequiv/g) at 80°C, which is higher than that of Nafion117 (0.146 S/cm). The SNPAEKs membranes exhibit the methanol permeability in the range of 3.42 × 10-8 - 4.49 × 10-7 cm2/s, which are much lower than that of Nafion117. They could be the promising materials as alternative to Nafion membrane for direct methanol fuel cells applications.

Original languageEnglish (US)
Pages (from-to)5772-5783
Number of pages12
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume47
Issue number21
DOIs
StatePublished - Nov 1 2009

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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    Shao, K., Zhu, J., Zhao, C., Li, X., Cui, Z., Zhang, Y., Li, H., Xu, D., Zhang, G., Fu, T., Jing, W., Na, H., & Xing, W. (2009). Naphthalene-based poly(arylene ether ketone) copolymers containing sulfobutyl pendant groups for proton exchange membranes. Journal of Polymer Science, Part A: Polymer Chemistry, 47(21), 5772-5783. https://doi.org/10.1002/pola.23621