Dynamics of an epoxy system near the glass transition studied by Brillouin and dielectric spectroscopies

L. Comez; Daniele Fioretto; L. Verdini; A. Livi; Pierangelo A. Rolla

doi:10.1117/12.276270

13 June 1997 Dynamics of an epoxy system near the glass transition studied by Brillouin and dielectric spectroscopies

L. Comez, Daniele Fioretto, L. Verdini, A. Livi, Pierangelo A. Rolla

Proceedings Volume 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications; (1997) https://doi.org/10.1117/12.276270
Event: Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, 1996, Szczyrk, Poland

Abstract

The relaxation processes of an epoxy resin were investigated by light scattering and broadband dielectric spectroscopy around the glass transition temperature T_g. Dielectric spectroscopy measurements give evidence of tow relaxations, a structural and a secondary one, merging into a single process well above T_g. Besides the regular divergence of the structural relaxation time, the glass transition is also evidenced by changes of the shape parameters and of the relaxation strength of the secondary process. A comparison between dielectric and Brillouin data shows that Brillouin spectra are markedly sensitive to the secondary relaxation.

Citation Download Citation

L. Comez, Daniele Fioretto, L. Verdini, A. Livi, and Pierangelo A. Rolla "Dynamics of an epoxy system near the glass transition studied by Brillouin and dielectric spectroscopies", Proc. SPIE 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, (13 June 1997); https://doi.org/10.1117/12.276270

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