Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
CYCLIC POLYSILOXANES .6. DIELECTRIC-RELAXATION OF POLYMETHYLPHENYLSILOXANES
Autore:
GOODWIN AA; BEEVERS MS; CLARSON SJ; SEMLYEN JA;
Indirizzi:
ASTON UNIV,DEPT CHEM ENGN & APPL CHEM BIRMINGHAM B4 7ET W MIDLANDS ENGLAND ASTON UNIV,DEPT CHEM BIRMINGHAM B4 7ET W MIDLANDS ENGLAND UNIV CINCINNATI,DEPT MAT SCI & ENGN CINCINNATI OH 45221 UNIV CINCINNATI,POLYMER RES CTR CINCINNATI OH 45221 YORK UNIV,DEPT CHEM YORK YO1 5DD N YORKSHIRE ENGLAND
Titolo Testata:
Polymer
fascicolo: 13, volume: 37, anno: 1996,
pagine: 2597 - 2602
SICI:
0032-3861(1996)37:13<2597:CP.DOP>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
DECAY FUNCTION; POLY(METHYLPHENYLSILOXANE);
Keywords:
DIELECTRIC RELAXATION; POLYMETHYLPHENYLSILOXANE; DIPOLE MOMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
A.A. Goodwin et al., "CYCLIC POLYSILOXANES .6. DIELECTRIC-RELAXATION OF POLYMETHYLPHENYLSILOXANES", Polymer, 37(13), 1996, pp. 2597-2602

Abstract

The dielectric alpha-relaxation of a series of linear polymethylphenylsiloxanes (PMPSs) has been investigated as a function of frequency inthe temperature range 155.5-262 K. The breadth of the relaxation process, according to the empirical Kohlrausch-Williams-Watts and Havriliak-Negami functions, increases as the molecular weight increases. The apparent activation energy passes through a maximum at n(n), = IO whichreflects the contribution of the whole molecule rotation to dipolar relaxation. A maximum in the dipole moment ratio occurs at n(n) similarto 50 due to dipole reinforcement. A similar investigation of a cyclic PMPS with n(n) = 10 indicates the effectiveness of dipolar cancellation in small siloxane rings. Copyright (C) 1996 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 15:36:09