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Dynamic mechanical thermal analysis studies of factors influencing relaxation in polyetherurethane based solid electrolytes

journal contribution
posted on 01.04.1998, 00:00 authored by S Ng, C Joliffe, A Goodwin, Maria ForsythMaria Forsyth, D MacFarlane
Dynamic mechanical thermal analysis (DMTA) has been used to study the effects of plasticizers on the mobility and homogeneity of a series of solid polymer electrolytes (SPEs). With reference to previously published results on similar systems containing LiClO4 salts and tetraglyme as plasticizer, the effects of propylene carbonate (PC) on the glass transition temperature (Tg) of the SPE and on the distribution of relaxation times within the sample are discussed; at low plasticizer concentration PC has little effect on Tg as measured by DMTA in comparison with tetraglyme, and at higher plasticizer concentrations PC significantly broadens the mechanical relaxation behaviour indicating a greater degree of dynamical heterogeneity within the sample. A second low temperature relaxation is evident at lower PC contents indicating that some regions of this plasticized SPE are distinctly more mobile than others or perhaps, on this length scale, that some degree of phase separation is present. Activation energies for the mechanical relaxation were also determined as a function of PC concentration and are significantly greater than those determined from conductivity measurements.

History

Journal

Electrochimica acta

Volume

43

Issue

10-11

Pagination

1499 - 1503

Publisher

Elsevier Science Pub. Co.

Location

New York, N.Y.

ISSN

0013-4686

eISSN

1873-3859

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1998, Elsevier Science Ltd.