Title :
Glass transition of an epoxy resin. A wideband dielectric investigation
Author :
Santucci, S.C. ; Corezzi, S. ; Fioretto, D. ; Capaccioli, S. ; Casalini, R. ; Lucchesi, M. ; Presto, S. ; Rolla, P.A.
Author_Institution :
Dipartimento di Fisica, Perugia Univ., Italy
fDate :
6/1/2001 12:00:00 AM
Abstract :
The dynamics of an epoxy resin, poly(phenyl glycidyl ether-co-formaldehyde), has been investigated in the supercooled and glassy phases by wideband dielectric spectroscopy (10-2 to 3×109 Hz) and compared with that of the previously investigated epoxy resin, diglycidyl ether of bisphenol-A. The temperature evolution of the dynamics of the system is monitored through the characteristic parameters of the relaxations, namely the relaxation times, the relaxation strengths and the shape parameters. Two transition regions are revealed: the glass transition and the split between structural and fast secondary relaxation, where the onset of the structural relaxation is located also
Keywords :
glass transition; permittivity; polymers; 1E-2 to 3E9 Hz; epoxy resin; glass transition; glassy phase; poly(phenyl glycidyl ether-co-formaldehyde); relaxation strength; relaxation time; shape parameters; supercooled phase; temperature evolution; wideband dielectric spectroscopy; Curing; Dielectric measurements; Electrochemical impedance spectroscopy; Epoxy resins; Frequency; Glass; Permittivity measurement; Solids; Temperature distribution; Wideband;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
