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Titolo:
THE ENTHALPIC RELAXATION OF AMORPHOUS POLY(ARYL ETHER KETONE)S
Autore:
GOODWIN AA; BROWNE MM;
Indirizzi:
MONASH UNIV,DEPT MAT ENGN CLAYTON VIC 3168 AUSTRALIA
Titolo Testata:
High performance polymers
fascicolo: 1, volume: 9, anno: 1997,
pagine: 1 - 15
SICI:
0954-0083(1997)9:1<1:TEROAP>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYVINYL METHYL-ETHER); CRYSTALLIZATION; MORPHOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
A.A. Goodwin e M.M. Browne, "THE ENTHALPIC RELAXATION OF AMORPHOUS POLY(ARYL ETHER KETONE)S", High performance polymers, 9(1), 1997, pp. 1-15

Abstract

The development of physical aging in four amorphous poly(aryl ether ketone)s at temperatures below the glass transition temperature, T-g, was studied using differential scanning calorimetry (DSC). The change in enthalpy lost on aging, determined by scanning through T-g, was usedto determine the kinetics of the aging process through fitting to theCowie-Ferguson model. The kinetics of aging were found to depend on the ketone-ether ratio as well as the substitution pattern of the polymers. The maximum enthalpy lost at equilibrium, Delta H-proportional to, was found to be a linear function of the change in heat capacity at T-g, Delta C-p(Tg), and the degree of supercooling, Delta T. A composite curve incorporating T-g values from physical aging and dynamic mechanical studies, covering 15 decades, could be fined to the Volger-Fulcher equation and demonstrated that physical aging is an extension of the glass forming process.

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Documento generato il 29/09/20 alle ore 06:39:31