Relaxation processes in an epoxy resin studied by time-resolved optical Kerr effect
Anno: 2002
Autori: Prevosto D., Bartolini P., Torre R., Ricci M., Taschin A., Capaccioli S., Lucchesi M., Rolla P.
Affiliazione autori: Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy; INFM, Unita Pisa, I-56127 Pisa, Italy; Univ Florence, Polo Sci, LENS, I-50019 Sesto Fiorentino, Italy; INFM, Unita Firenze, I-50019 Sesto Fiorentino, Italy; Univ Florence, Polo Sci, Dipartimento Fis, I-50019 Sesto Fiorentino, Italy; Univ Basilicata, Dipartimento Chim Fis, I-85100 Potenza, Italy.
Abstract: The dynamics of the epoxy resin phenyl glycidyl ether, a fragile glass-forming liquid, is investigated in the liquid and supercooled phases by time-resolved optical Kerr effect experiment with an heterodyne detection technique. We tested the mode-coupling theory and found that the predicted dynamic scenario allows to reproduce properly the measured signal, for t>1 ps, in the whole temperature interval investigated. Furthermore, the values of T-c and lambda, obtained from the analysis of three different and independent dynamic regimes (alpha regime, von Schweidler, beta regime), are in remarkable agreement. Moreover, relaxation times obtained from optical Kerr effect and dielectric spectroscopy measurements are compared. The two time scales differ only for a constant factor in the whole temperature interval investigated.
Giornale/Rivista: PHYSICAL REVIEW E
Volume: 66 (1) Da Pagina: 11502-1 A: 11502-12
Parole chiavi: Mode-coupling Theory; Liquid-glass Transition; Stimulated Light-scattering; Supercooled Liquids; Structural Relaxation; Forming Liquid; Dynamics; Domain; Spectroscopy; FormerDOI: 10.1103/PhysRevE.66.011502Citazioni: 10dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-06-08Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)
