Viscosity of salt-in-polymer solutions near the glass transition temperature by penetrometry, and pseudo-macromolecule behaviour at a critical composition in NaClO4-PPO(4000)

M. G. McLin, Charles Angell

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The first viscosity measurements of pure PPO(4000) and PPO(4000) liquid polymer electrolytes at temperatures in the vicinity of the glass transition temperature are reported. At the lower temperatures, ion pairing effects on the transport coefficients are suppressed, permitting some general trends in the dependence of the Vogel-Tammann-Fulcher (VTF) viscosity equation parameters on the salt concentration to be discerned. These are discussed in terms of ion-polymer interactions. Anomalies are noted at the composition M/O = 1/30, where some previous studies have found phase separations and these are particularly striking in the case of NaClO4 solutions for which the VTF equation parameters cannot be reconciled with the observed calorimetric glass transition temperature. The existence of a low temperature thermoplastic (rubbery) domain, is identified and a special chain end linking mechanism, which is optimized in the NaClO4 case, is proposed to account for it.

Original languageEnglish (US)
Pages (from-to)4713-4721
Number of pages9
JournalPolymer
Volume37
Issue number21
DOIs
StatePublished - Oct 1996

Keywords

  • Novel thermoplasticity
  • Penetrometry
  • Polymer electrolytes
  • Viscosity near T

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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