CROSSOVER FROM DEBYE TO NON-DEBYE DYNAMICAL BEHAVIOR OF THE ALPHA-RELAXATION OBSERVED BY QUASI-ELASTIC NEUTRON-SCATTERING IN A GLASS-FORMING POLYMER

Citation
J. Colmenero et al., CROSSOVER FROM DEBYE TO NON-DEBYE DYNAMICAL BEHAVIOR OF THE ALPHA-RELAXATION OBSERVED BY QUASI-ELASTIC NEUTRON-SCATTERING IN A GLASS-FORMING POLYMER, Physical review letters, 71(16), 1993, pp. 2603-2606
Citations number
22
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
71
Issue
16
Year of publication
1993
Pages
2603 - 2606
Database
ISI
SICI code
0031-9007(1993)71:16<2603:CFDTND>2.0.ZU;2-Z
Abstract
The dynamics of a very fragile glass-forming polymer is studied by tim e of flight neutron scattering in a time scale from 10(-13) to 10(-11) s. We observe a crossover from a Debye-like to a non-Debye behavior a t a characteristic time which is effectively independent of temperatur e and momentum transfer Q. We also confirm the results previously obta ined about the non-Debye alpha relaxation in a different time scale (1 0(-11) to 10(-8) s). The results here reported open a new outlook for understanding the fast dynamics of glass-forming systems.