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Proceedings Paper

Dielectric and light scattering analysis of the -relaxation of an epoxy system
Author(s): L. Comez; Daniele Fioretto; L. Palmieri; L. Verdini; Silvia Corezzi; J. Gapinski; A. Patkowski; W. Steffen; Edgar W. Fischer
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Paper Abstract

The dynamics of an epoxy compound has been studied by wideband dielectric spectroscopy and light scattering above the glass transition temperature, Tg. A change of diffusion mechanism in the supercooled liquids has been recognized some tens of degrees above the glass transition, where a change in the temperature behavior of the main relaxation time occurs, together with the splitting of the structural and secondary relaxations and deviation from the Stokes-Einstein-Debye diffusion law. The light scattering results can be interpreted in terms of a correlation length for the structural relaxation which increases for decreasing temperature.

Paper Details

Date Published: 14 December 1999
PDF: 5 pages
Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); doi: 10.1117/12.373694
Show Author Affiliations
L. Comez, INFM and Univ. of Perugia (Italy)
Daniele Fioretto, INFM and Univ. of Perugia (Italy)
L. Palmieri, INFM and Univ. of Perugia (Italy)
L. Verdini, INFM and Univ. of Perugia (Italy)
Silvia Corezzi, INFM and Univ. of Pisa (Italy)
J. Gapinski, Max-Planck-Institut fuer Polymerforschung and Adam Mickiewicz Univ. Poznan (Germany)
A. Patkowski, Max-Planck-Institut fuer Polymerforschung and Adam Mickiewicz Univ. Poznan (Germany)
W. Steffen, Max-Planck-Institut fuer Polymerforschung (Germany)
Edgar W. Fischer, Max-Planck-Institut fuer Polymerforschung (Germany)

Published in SPIE Proceedings Vol. 4017:
Polymers and Liquid Crystals
Andrzej Wlochowicz, Editor(s)

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