Synthesis and protonic conductivity of the oligomeric amides with different average molecular weights

Yuki Nagao, Aya Haneda, Nobuhiro Naito, Fumitada Iguchi, Noriko Sata, Hiroo Yugami

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

New oligomeric amides were synthesized by the reaction of m-xylylenediamine and dimethyl oxalate to investigate the average molecular weight dependence of the protonic condcutivity. The average molecular weight was determined by the analysis of the Matrix Assisted Laser Desorption / Ionization Time of Flight (MALDI-TOF) mass spectra. The average molecular weight was decreased with increasing the quantity of water in the reaction condition. Some end groups of the oligomers were hydrolysed from the methoxycarbonyl groups to the calboxylic acid groups. The oligomers with the different average molecular weight exhibited different relative humidity (RH) dependence of the protonic conductivity. The protonic conductivity depends on the average molecular weight at the RH of 95%. The difference between the maximum and minimum protonic condcutivity is about three orders of the magnitude. The activation energy for the protonic conduction in one of the oligomers is 0.66 eV.

Original languageEnglish
Pages (from-to)1142-1145
Number of pages4
JournalSolid State Ionics
Volume179
Issue number21-26
DOIs
Publication statusPublished - 2008 Sep 15

Keywords

  • Average molecular weight
  • Oligomers
  • Proton conduction

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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