One-pot synthesis of high molecular weight sulfonated poly(oxadiazole-triazole) copolymers for proton conductive membranes

Mariela L. Ponce*, Dominique Gomes, Suzana Nunes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

For the first time, a series of high molecular weight (1-4 × 105 g mol-1) sulfonated poly(oxadiazole-triazole) copolymers have been synthesized at high temperatures and very short reaction time, by a single-step method based on solution polycondensation reaction of non-sulfonated dicarboxylic acid, hydrazine sulphate and aromatic primary amine (sulfonated and non-sulfonated) in poly(phosphoric acid). By this fast synthetic procedure, copolymers with a high conversion to triazole groups (up to 93%) as well high sulfonation level (IEC = 1.17-1.84 mequiv. g-1) have been obtained. The structure of the polymers was characterized by elemental analysis and 1H NMR. Since high sulfonation levels (IEC = 1.17-1.84 mequiv. g-1) could be obtained, membranes were prepared from these polymers and have been characterized aiming the application in fuel cells. Proton conductivity up to 6 × 10-2 S cm-1 at 150 °C was measured. The polymer films had good mechanical properties with storage modulus of about 3 GPa at 300 °C. These films exhibited high thermal stability with Tg up to around 440 °C.

Original languageEnglish (US)
Pages (from-to)14-22
Number of pages9
JournalJournal of Membrane Science
Volume319
Issue number1-2
DOIs
StatePublished - Jul 1 2008

Keywords

  • Fuel cell
  • Polyoxadiazole
  • Polytriazole
  • Proton conductor
  • Sulfonation

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Fingerprint

Dive into the research topics of 'One-pot synthesis of high molecular weight sulfonated poly(oxadiazole-triazole) copolymers for proton conductive membranes'. Together they form a unique fingerprint.

Cite this