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Titolo:
DIELECTRIC AND DYNAMIC-MECHANICAL RELAXATION STUDIES ON POLY(ARYL ETHER KETONE)S
Autore:
GOODWIN AA; HAY JN;
Indirizzi:
MONASH UNIV CLAYTON VIC 3168 AUSTRALIA UNIV BIRMINGHAM BIRMINGHAM B15 2TT W MIDLANDS ENGLAND
Titolo Testata:
Journal of polymer science. Part B, Polymer physics
fascicolo: 5, volume: 36, anno: 1998,
pagine: 851 - 859
SICI:
0887-6266(1998)36:5<851:DADRSO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
BEHAVIOR; POLYMERS; IDENTIFICATION; MIXTURES; PEEK;
Keywords:
POLY(ARYL ETHER KETONE)S; DIELECTRIC RELAXATION SPECTROSCOPY; DYNAMIC MECHANICAL ANALYSIS; ALPHA-RELAXATION; BETA-RELAXATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
A.A. Goodwin e J.N. Hay, "DIELECTRIC AND DYNAMIC-MECHANICAL RELAXATION STUDIES ON POLY(ARYL ETHER KETONE)S", Journal of polymer science. Part B, Polymer physics, 36(5), 1998, pp. 851-859

Abstract

The relaxation behavior of four amorphous poly(aryl ether ketone)s was investigated using dielectric relaxation spectroscopy and dynamic mechanical analysis. The temperature dependence of the relaxation times of the glass transition process and the cooperative nature of this process were unaffected by changes in polymer structure. The temperature location of the loss peaks for all polymers progressed smoothly between the low frequency of the mechanical measurements and the higher frequencies of the dielectric probe. Differences were observed in mechanical activation energy and dielectric relaxation strength for one polymer which contained a significant concentration of meta linkages, compared with the para-linked polymers, while relaxation broadness was generally greater in the dynamic mechanical mode. Changes in chemical structure had little effect on the shape, intensity, and location of the beta-relaxation peak, the main observation being that the Arrhenius activation energy measured by dynamic mechanical analysis was significantly higher than that calculated from the dielectric data. The dielectricbeta-relaxation was sensitive to absorbed moisture. (C) 1998 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 06:17:50