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Titolo:
GLASS-TRANSITION BEHAVIOR OF POLY(ETHER ETHER KETONE) POLY(ETHER IMIDE) BLENDS
Autore:
GOODWIN AA; SIMON GP;
Indirizzi:
MONASH UNIV,DEPT MAT ENGN CLAYTON VIC 3168 AUSTRALIA
Titolo Testata:
Polymer
fascicolo: 6, volume: 37, anno: 1996,
pagine: 991 - 995
SICI:
0032-3861(1996)37:6<991:GBOPEK>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEMICRYSTALLINE MORPHOLOGY; SEGMENTAL RELAXATION; MELTING BEHAVIOR; POLYMER BLENDS; TEMPERATURE;
Keywords:
POLYMER BLENDS; GLASS TRANSITION; SPECIFIC INTERACTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
A.A. Goodwin e G.P. Simon, "GLASS-TRANSITION BEHAVIOR OF POLY(ETHER ETHER KETONE) POLY(ETHER IMIDE) BLENDS", Polymer, 37(6), 1996, pp. 991-995

Abstract

Differential scanning calorimetry (d.s.c.), dynamic mechanical thermal analysis (d.m.t.a.) and dielectric relaxation spectroscopy (DRS) have been used to study the a-relaxation in amorphous blends of poly(ether ether ketone) (PEEK) and poly(ether imide) (PEI). The composition dependence of the d.s.c. T-g is well described by the Couchman and Gordon-Taylor equations while the isothermal dielectric loss curves can be fitted by the empirical Havriliak-Negami (HN) function. The HN parameters can be represented in the form of cooperativity plots which show that they do not follow a weighted average with changing composition. The time scale for dipolar relaxation in the blends is dominated by PEI, which relaxes at a relatively slower rate compared with PEEK, while the composition dependence of the apparent activation energy shows a negative deviation from additive behaviour. It is likely that these observations are related to the interactions between the blend componentswhich result in changes in the local molecular environment on blending.

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Documento generato il 29/09/20 alle ore 07:43:14