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Titolo:
FRAGILITY AND LOW-TEMPERATURE EXCESS SPECIFIC-HEAT IN POLYMER ELECTROLYTES
Autore:
DANGELO G; TRIPODO G; CARINI G; BARTOLOTTA A;
Indirizzi:
UNIV MESSINA,INFM,CONTRADA PAPARDO SALITA SPERONE 31 I-98166 MESSINA ITALY UNIV MESSINA,INFM I-98166 MESSINA ITALY UNIV MESSINA,DIPARTIMENTO FIS I-98166 MESSINA ITALY CNR,IST TECN SPETTROSCOP I-98166 MESSINA ITALY
Titolo Testata:
Journal of non-crystalline solids
, volume: 235, anno: 1998,
pagine: 697 - 703
SICI:
0022-3093(1998)235:<697:FALESI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLASS FORMERS; POLYBUTADIENES; RELAXATIONS; BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
G. Dangelo et al., "FRAGILITY AND LOW-TEMPERATURE EXCESS SPECIFIC-HEAT IN POLYMER ELECTROLYTES", Journal of non-crystalline solids, 235, 1998, pp. 697-703

Abstract

The mechanical properties and the low temperature specific heat have been measured in a class of polymer electrolytes based on complexes ofpoly(ethylene) oxide (PEO) and sodium metal salts. These blends are semicrystalline polymers whose degree of crystallinity is affected by the salt concentration: increasing the salt molar fraction tends to produce a single crystalline phase. The ''fragility'' of the amorphous phase has been obtained by modelling the mechanical alpha(a) relaxation. Increasing crystallinity increase the non-exponentiality of the alpha(a) relaxation and decreases both the fragility and the excess specific heat over that predicted by the Debye theory. These effects proves that the additional low-energy vibrations causing the low temperature excess specific heat are mainly introduced by the amorphous phase with no correlation with the degree of fragility. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 08:27:28