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Titolo:
RELAXATIONS VERSUS CROSS-LINK DENSITY IN GLASS-FORMING AND GEL-FORMING POLYURETHANE
Autore:
SCHEYER Y; LEVELUT C; PELOUS J; COOK JC; JOHNSON M; PROCHAZKA F; DURAND D;
Indirizzi:
UNIV MONTPELLIER 2,LAB VERRES,PL E BATAILLON,CC 69 F-34095 MONTPELLIER FRANCE UNIV MONTPELLIER 2,LAB VERRES F-34095 MONTPELLIER FRANCE INST MAX VON LAUE PAUL LANGEVIN F-38000 GRENOBLE FRANCE UNIV MAINE,LAB PHYSICOCHIM POLYMERES F-72017 LE MANS FRANCE
Titolo Testata:
Physica. B, Condensed matter
, volume: 234, anno: 1997,
pagine: 445 - 447
SICI:
0921-4526(1997)234:<445:RVCDIG>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRILLOUIN-SCATTERING; NEUTRON-SCATTERING; LIGHT-SCATTERING; DYNAMICS; POLYBUTADIENE; TRANSITION;
Keywords:
GLASS TRANSITION; BRILLOUIN SCATTERING; BACKSCATTERING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
Y. Scheyer et al., "RELAXATIONS VERSUS CROSS-LINK DENSITY IN GLASS-FORMING AND GEL-FORMING POLYURETHANE", Physica. B, Condensed matter, 234, 1997, pp. 445-447

Abstract

An experimental investigation of the relaxational processes related to the glass transition is presented in polymers where the crosslink density can be varied. This study is an extension of previous measurements to higher frequencies. We used inelastic light and neutron scattering to determine the relaxation times in the 10(-8)-10(-12) s range. The relaxation lime determined from neutron backscattering exhibits a Q(-3.7) dependence, as already found for the alpha process in other glass-forming systems. The time measured by Brillouin scattering splits from the structural relaxation time.

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Documento generato il 02/12/20 alle ore 18:21:37