Very fast relaxation in polycarbonate glass

Low-frequency Raman and inelastic neutron scattering of amorphous bis-phenol A polycarbonate is measured at low temperature, and compared. The vibrational density of states and light-vibration coupling coefficient are determined. The frequency dependences of these parameters are explained by propaga...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2000-10, Vol.17 (4), p.661-666
Main Authors: SAVIOT, L, DUVAL, E, JAL, J. F, DIANOUX, A. J
Format: Article
Language:English
Subjects:
Applied sciences
Condensed Matter
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Lattice dynamics
Organic polymers
Other
Physicochemistry of polymers
Physics
Properties and characterization
Structure, morphology and analysis
Vibrational states in disordered systems
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Summary:Low-frequency Raman and inelastic neutron scattering of amorphous bis-phenol A polycarbonate is measured at low temperature, and compared. The vibrational density of states and light-vibration coupling coefficient are determined. The frequency dependences of these parameters are explained by propagating vibration modes up to an energy of about 1 meV, and fracton-like modes in more cohesive domains at higher energies. The vibrational dynamics is in agreement with a disorder in the glass, which is principally of bonding or of elasticity instead of density.
ISSN:1434-6028
1434-6036
DOI:10.1007/s100510070105