Neutron Scattering Study of the Vibration-Relaxation Crossover in Amorphous Polycarbonates
- 24 October 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 73 (17) , 2344-2347
- https://doi.org/10.1103/physrevlett.73.2344
Abstract
We report on neutron scattering observations of the fast picosecond relaxation in two amorphous polycarbonates. Contrary to previous experience, one already observes these fast relaxations far below the glass transition, at temperatures where they cannot be related to the flow process. An explanation in terms of low-barrier structural relaxations is proposed.Keywords
This publication has 29 references indexed in Scilit:
- Crossover from Debye to non-Debye dynamical behavior of the α relaxation observed by quasielastic neutron scattering in a glass-forming polymerPhysical Review Letters, 1993
- Relaxation and phonons in viscous and glassy orthoterphenyl by neutron scatteringZeitschrift für Physik B Condensed Matter, 1993
- Low-energy excitation and fast motion near T g in amorphous cis-1,4-polybutadieneThe Journal of Chemical Physics, 1993
- Dynamics of bisphenol A polycarbonate in the glassy and rubbery states as studied by neutron scattering and complementary techniquesMacromolecules, 1993
- Correlation between non-Debye behavior andQbehavior of the α relaxation in glass-forming polymeric systemsPhysical Review Letters, 1992
- Self-similar light-scattering spectra of β relaxation near the liquid-glass transitionPhysical Review Letters, 1991
- Dynamic instability of liquidlike motions in a globular protein observed by inelastic neutron scatteringPhysical Review Letters, 1990
- Temperature dependence of the nonergodicity parameter in polybutadiene in the neighborhood of the glass transitionPhysical Review Letters, 1990
- Universal Form of the Low-Energy (2 to 10 meV) Vibrational Spectrum of GlassesEurophysics Letters, 1990
- Observation of Scaling Behaviour of Dynamic Correlations near Liquid-Glass TransitionEurophysics Letters, 1988