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Titolo:
Poly(aryl ether ketone)s containing dibenzoylbiphenyl groups: dynamic mechanical and physical ageing behaviour
Autore:
Goodwin, AA; Campbell, JA; Wang, ZY;
Indirizzi:
Monash Univ, Dept Mat Engn, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 Engn, Clayton, Vic 3168, Australia Carleton Univ, Dept Chem, Ottawa, ON K1S 5B6, Canada Carleton Univ OttawaON Canada K1S 5B6 t Chem, Ottawa, ON K1S 5B6, Canada
Titolo Testata:
POLYMER INTERNATIONAL
fascicolo: 5, volume: 48, anno: 1999,
pagine: 353 - 359
SICI:
0959-8103(199905)48:5<353:PEKCDG>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRUCTURAL RELAXATION; ENTHALPY RELAXATION; POLYMERS; POLYIMIDES; BIPHENYL;
Keywords:
poly(aryl ether ketone)s; dibenzoylbiphenyl; dynamic mechanical analysis; physical ageing; enthalpy relaxation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Goodwin, AA Monash Univ, Dept Mat Engn, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 n, Vic 3168, Australia
Citazione:
A.A. Goodwin et al., "Poly(aryl ether ketone)s containing dibenzoylbiphenyl groups: dynamic mechanical and physical ageing behaviour", POLYM INT, 48(5), 1999, pp. 353-359

Abstract

The dynamic mechanical and physical ageing behaviour of a series of isomeric poly(aryl ether ketone)s containing 2,2'- and 3,3'-dibenzoylbiphenyl groups has been determined. A secondary gamma-process, which was detected in all polymers by dynamic mechanical analysis, was both broader and located athigher temperatures in the 3,3' polymers; this was attributed to greater intermolecular cooperativity and a higher effective relaxation time, arisingfrom the more densely packed chains. The enthalpy relaxation of a pair of isomers was analysed using a common multi-parameter model for structural relaxation. The equilibrium enthalpy lost by the aged glass showed good agreement with the value extrapolated from the liquid state. Although the enthalpy lost by the equilibrium glass was identical for each isomer, the 3,3' substituted polymer required a longer time to reach equilibrium and showed a greater dependence of physical ageing on structure. The higher density of the 3,3 isomer resulted in a slowing of both the physical ageing and the mechanical relaxation process. (C) 1999 Society of Chemical Industry.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 16:10:19