Abstract
The ThermoStimulated Current spectroscopy has been applied to the investigation of epoxy based network around the glass transition, Tg, in order to characterize the molecular mobility of the crosslinked network. The polymeric network chosen is a commercial polyepoxy TGMDA-TGPAP-DDA. On the TSC spectrum three relaxation modes are observed: the /spl gamma/ and /spl beta/ modes respectively situated around -166/spl deg/C and -100/spl deg/C and the /spl alpha/ mode located around 90/spl deg/C. The /spl gamma/ relaxation has been assigned to, movements of residual epoxy groups. The /spl beta/ mode is constituted of two sub-modes: the /spl beta//sub 1/ component at lower temperature is attributed to intermolecular mobility of segments containing benzene rings: it obeys a compensation law. The /spl beta//sub 2/ component at higher temperature is due to non-cooperative crankshaft type rotation of the hydroxyether sequences. The TSC /spl alpha/ relaxation mode has been attributed to the dielectric manifestation of the glass transition.
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