Very fast relaxation in polycarbonate glass

L. Saviot (1) , E. Duval (1) , J. F. Jal (2) , A. J. Dianoux (3)

1 LPCML - Laboratoire de Physico-Chimie des Matériaux Luminescents
2 LPMCN - Laboratoire de Physique de la Matière Condensée et Nanostructures
3 ILL - Institut Laue-Langevin

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.

Domaines: Autre [cond-mat.other]

L. Saviot, E. Duval, J. F. Jal, A. J. Dianoux. Very fast relaxation in polycarbonate glass. The European Physical Journal B: Condensed Matter and Complex Systems, 2000, 17, pp.661-666. ⟨10.1007/s100510070105⟩. ⟨hal-00112254⟩