Sulfonated polytriazoles from a new fluorinated diazide monomer and investigation of their proton exchange properties

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Asheesh Singh - , Indian Institute of Technology Kharagpur (Author)
  • Rajdeep Mukherjee - , Indian Institute of Technology Kharagpur (Author)
  • Susanta Banerjee - , Indian Institute of Technology Kharagpur (Author)
  • Hartmut Komber - , Leibniz Institute of Polymer Research Dresden (Author)
  • Brigitte Voit - , Leibniz Institute of Polymer Research Dresden (Author)

Abstract

A series of new fluorinated sulfonated polytriazoles with varying degree of sulfonation was synthesized using the click reaction of a new diazide monomer; 4,4-bis[3-trifluoromethyl-4(4-azidophenoxy)phenyl] biphenyl (QAZ) and 4,4'-diazido-2,2'-stilbenedisulfonic acid disodium salt (DADSDB) with 4,4'-(propane-2,2-diyl)bis((prop-2-ynyloxy)benzene) (BPEBPA). The structures of the polytriazoles were confirmed by FTIR and NMR (H-1, C-13 and F-19) spectroscopy. The polytriazoles exhibit high molecular weights, and good solubility and film forming capabilities, combined with high thermal and chemical stabilities, low water uptake, good dimensional stability and high mechanical properties which makes them interesting materials as proton exchange membranes. TEM images of the polytriazole membranes showed nanophase separated morphology with ionic clusters in the range of 5-65 nm. The proton conductivities of the fluorinated membranes were found in the range of 12-76 mS/cm at 80 degrees C in water. A maximum value of even 112 mS/cm was achieved for the non-fluorinated sample. (C) 2014 Elsevier B.V. All rights reserved.

Details

Original languageEnglish
Pages (from-to)225-237
Number of pages13
JournalJournal of membrane science
Volume469
Publication statusPublished - 1 Nov 2014
Peer-reviewedYes
Externally publishedYes

External IDs

Scopus 84904337774
ORCID /0000-0002-4531-691X/work/148607934

Keywords

Keywords

  • Click polymerization, Fluorinated sulfonated polytriazoles, Membrane properties, NMR study