Synthesis and Characterization of a Phosphonated Graft Copolyimide

Authors

  • Nathinee Srinate Chulalongkorn University
  • Supakanok Thongyai Chulalongkorn University
  • Piyasan Praserthdam Chulalongkorn University
  • Robert A. Weiss University of Akron

DOI:

https://doi.org/10.4186/ej.2014.18.1.119

Keywords:

Copolyimide, phosphonic acid, PEM fuel cell.

Abstract

A new synthesis route of phosphonated multiblock, branched copolyimide is proposed in this research. The synthesis and characterization of the series of new phosphonated graft copolyimides were prepared by combination of one-step high temperature polymerization and phosphonation method by lithiation and reaction with excess diethylchlorophosphate. The phosphonate ester product was converted to the phosphonic acid by hydrolysis. A branched polyimide structure was achieved by coupling the two polyimides with 3, 3'-diaminobenzidine. A phosphonated branched copolyimide with 32% mol phosphonation exhibited high thermal stability, with a decomposition temperature in nitrogen of ∼475°C. Proton exchange membranes prepared from these copolyimides had proton conductivity of 0.02 - 0.03 S/cm at 100% humidity over a temperature range of 40 - 100°C.

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Author Biographies

Nathinee Srinate

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Supakanok Thongyai

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Piyasan Praserthdam

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Robert A. Weiss

Department of Polymer Engineering, University of Akron, 250 South Forge Street, Akron, OH 44325-0301, USA

Published

Vol 18 No 1, Jun 13, 2013

How to Cite

[1]
N. Srinate, S. Thongyai, P. Praserthdam, and R. A. Weiss, “Synthesis and Characterization of a Phosphonated Graft Copolyimide”, Eng. J., vol. 18, no. 1, pp. 119-128, Jun. 2013.

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