QUASI-ELASTIC SCATTERING AND FAST LOCALIZED RELAXATION IN POLY(METHYLMETHACRYLATE) GLASS

Authors
DUVAL E MERMET A SUROVTSEV N JAL JF DIANOUX AJ
Citation
E. Duval et al., QUASI-ELASTIC SCATTERING AND FAST LOCALIZED RELAXATION IN POLY(METHYLMETHACRYLATE) GLASS, Philosophical magazine. B. Physics of condensed matter.Statistical mechanics, electronic, optical and magnetic, 77(2), 1998, pp. 457-461
Citations number
8
Categorie Soggetti
Physics, Applied",Mechanics,"Physics, Condensed Matter","Material Science
Journal title
Philosophical magazine. B. Physics of condensed matter.Statistical mechanics, electronic, optical and magnetic → ACNP
ISSN journal
13642812
Volume
77
Issue
2
Year of publication
1998
Pages
457 - 461
Database
ISI
SICI code
1364-2812(1998)77:2<457:QSAFLR>2.0.ZU;2-W
Abstract
In poly(methyl methacrylate) glass at temperatures much lower than the glass transition temperature, one observes quadielastic light or neut ron scattering. The corresponding relaxation time is short (about 4 x 10(-12) s) and weakly dependent on temperature. Conversely the intensi ty of quasielastic scattering is strongly temperature dependent. It is found that this intensity and the mean square displacement due to anh armonic motions have the same temperature dependence as that of the ho le volume fraction, which is determined by positron annihilation lifet ime spectroscopy. The relation between the slow relaxation, which is r esponsible for the dynamic hole volume fraction, and the localized fas t relaxation, is emphasized.