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Titolo:
DYNAMIC-MECHANICAL THERMAL-ANALYSIS STUDIES OF FACTORS INFLUENCING RELAXATION IN POLYETHERURETHANE BASED SOLID ELECTROLYTES
Autore:
NG STC; JOLLIFFE C; GOODWIN A; FORSYTH M; MACFARLANE DR;
Indirizzi:
MONASH UNIV,DEPT MAT ENGN CLAYTON VIC 3168 AUSTRALIA MONASH UNIV,DEPT CHEM CLAYTON VIC 3168 AUSTRALIA
Titolo Testata:
Electrochimica acta
fascicolo: 10-11, volume: 43, anno: 1998,
pagine: 1499 - 1503
SICI:
0013-4686(1998)43:10-11<1499:DTSOFI>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMER ELECTROLYTES; LITHIUM PERCHLORATE;
Keywords:
POLYMER ELECTROLYTES; DYNAMIC MECHANICAL THERMAL ANALYSIS; MECHANICAL RELAXATION; PLASTICIZERS; GLASS TRANSITION TEMPERATURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
S.T.C. Ng et al., "DYNAMIC-MECHANICAL THERMAL-ANALYSIS STUDIES OF FACTORS INFLUENCING RELAXATION IN POLYETHERURETHANE BASED SOLID ELECTROLYTES", Electrochimica acta, 43(10-11), 1998, pp. 1499-1503

Abstract

Dynamic mechanical thermal analysis (DMTA) has been used to study theeffects 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 LiCIO4 salts and tetraglyme as plasticizer, the effects of propylene carbonate (PC) on the glasstransition temperature (T-g) of the SPE and on the distribution of relaxation times within the sample are discussed; at low plasticizer concentration PC has little effect on T-g 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 thatsome 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 :relaxationwere also determined as a function of PC concentration and are significantly greater than those determined from conductivity measurements. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 08/07/20 alle ore 01:29:39