Polynorbornenes bearing pendent cyclotriphosphazenes with oligoethyleneoxy side groups: Behavior as solid polymer electrolytes

Harry R. Allcock, Walter R. Laredo, E. Clay Kellam, Robert V. Morford

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Three different polynorbornenes (PNB) with pendent cyclotriphosphazene side units that bear different short-chain oligoethyleneoxy side groups were synthesized via ring-opening metathesis polymerization (ROMP). Polymers with methoxyethoxy (-OCH2CH2)nOCH3 (n = 1), di(ethylene glycol) methyl ether (n = 2), and tri(ethylene glycol) methyl ether (n = 3) were synthesized and characterized by multinuclear NMR, GPC, DSC, and elemental analysis. The solid polymers were complexed with LiSO3- CF3 and LiN(SO2CF3)2 (10-60% molar ratios), and the ionic conductivities were measured by impedance analysis as a function of temperature. The polymers with methoxyethoxy side units showed no detectable ambient temperature conductivities within the limitations of the impedance analyzer. The conductivities of the other polymer electrolytes increased as the concentration of salt was increased, with similar maximum conductivities found for the di(ethylene glycol) and tri(ethylene glycol) systems (2.1×10-5 S/cm at 30 °C with the use of 40 mol% LiN(SO2CF3)2 in both cases). The conductivities showed non-Arrhenius temperature dependence. No melting or crystallization transitions were detected at temperatures above 25 °C for any of polymer-salt complexes tested. Modification of one polymer with -O(CH2CH2O)3CH3 side chains was carried out by epoxidation of the backbone C = C bonds.

Original languageEnglish (US)
Pages (from-to)787-794
Number of pages8
JournalMacromolecules
Volume34
Issue number4
DOIs
StatePublished - Feb 13 2001

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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