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Titolo:
Coupling model explanation of salient dynamic properties of glass-forming substances
Autore:
Ngai, KL;
Indirizzi:
USN, Res Lab, Washington, DC 20375 USA USN Washington DC USA 20375USN, Res Lab, Washington, DC 20375 USA
Titolo Testata:
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
fascicolo: 3, volume: 8, anno: 2001,
pagine: 329 - 344
SICI:
1070-9878(200106)8:3<329:CMEOSD>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONCENTRATED COLLOIDAL SUSPENSIONS; DEPOLARIZED LIGHT-SCATTERING; MISCIBLE POLYMER BLENDS; VISCOELASTIC PROPERTIES; AMORPHOUS POLYMERS; SEGMENTAL RELAXATION; DIELECTRIC-RELAXATION; BETA-RELAXATION; THERMORHEOLOGICAL COMPLEXITY; SUPERCOOLED LIQUIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
110
Recensione:
Indirizzi per estratti:
Indirizzo: Ngai, KL USN, Res Lab, Washington, DC 20375 USA USN Washington DC USA 20375 N, Res Lab, Washington, DC 20375 USA
Citazione:
K.L. Ngai, "Coupling model explanation of salient dynamic properties of glass-forming substances", IEEE DIELEC, 8(3), 2001, pp. 329-344

Abstract

Most of the important and general dynamic properties of structural glass-forming substances have been classified into twelve different categories in a recent review. Within the same property in each category, by examining a large number of glass-formers, a pattern of variation is found which correlates with the departure of the structural relaxation of the glass-former from exponential decay or the quantity 1 - beta, where beta is the fractionalexponent in the Kohlrausch expression exp[-(t/tau)(beta)], that well describes the time dependence of the structural a relaxation. The correlation ofthe patterns or trends with 1 - beta suggests that the salient dynamic properties, or phenomenology, of glass-forming substances, all are governed bythe non-exponential nature of the structural relaxation, i.e, the quantity1 - beta. Therefore, a theory or model capable of relating the structural relaxation time tau to 1 - beta has the potential of explaining most, if not all, of the salient dynamic properties of glass-forming substances. The coupling model of the author has this relation. In this accompanying paper we show the coupling model can either explain or interpret all these properties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 13:11:48