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Preparation of Novel Naphthalenic Sulfonated Polyimide Proton Conductive Membrane

SHANG Yu-Ming1; XIE Xiao-Feng1*; LIU Yang1; XU Jing-Ming1; MAO Zong-Qiang1; ZHOU Qi-Feng2   

  1. 1. Institute of Nuclear and New Energy Technology, Tsinghua University,
    Beijing 100084, China;
    2. Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,
    College of Chemistry & Molecular Engineering, Peking University,
    Beijing 100871, China
  • Received:2005-07-19 Revised:1900-01-01 Online:2006-06-10 Published:2006-06-10
  • Contact: XIE Xiao-Feng

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Abstract: To prepare proton conductive membrane for DMFC, a novel sulfonated diamine 1,4-bis(4-amino-2-sulfonic-phenoxy)-benzene(DS-TBDA) was synthesized and polymerized with a non-sulfonated diamine(ODA) and naphthalene-1,4,5,8-tetracaboxylic dianhydride(NTDA) to get a series of naphalenic sulfonated polyimides(S-PI). The sulfonation degree of the polymers was controlled by changing the molar ratio of the monomers. The obtained SPI membrane was characterized by FTIR and the properties, such as water uptake, proton conductivity and methanol permeability, were investigated. With the increase of sulfonation degree, the proton conductivity and methanol permeability raise gradually. The proton conductivities of the SPI membranes are in a range of from 0.007 9 to 0.072 S/cm and the methanol permeability is less than 2.85×10-7 cm2/s. The experiment result indicats they are great potential candidates for fuel cell applications.

Key words: Sulfonated polyimides, Sulfonated diamine, Proton conductive membrane, DMFC

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