Journal of Chemical Physics, ( ISI ), Volume (134), No (4), Year (2011-1) , Pages (44510-44516)

Title : ( Temperature and pressure dependence of secondary process in an epoxy system )

Authors: Soheil SHarifi , Simone Capaccioli , Mauro Lucchesi , Pierangelo Rolla , Daniele Prevosto ,

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Abstract

Dielectric spectroscopy as a function of temperature and pressure was used to study the secondary relaxation in poly [(phenyl glycidyl ether)-co-formaldehyde] at hydrostatic pressure up to 600 MPa and at different temperatures between 315 and 243 K. From the analysis of the isothermal measurements, we observe that the activation volume of the secondary relaxation has nonmonotonic temperature dependence with a maximum at the temperature of the glass transition at ambient pressure. An interpretation in terms of mean hole volume dispersion is proposed based on literature data. Moreover, from isobaric data, we studied the effect of pressure on activation entropy and enthalpy of the secondary relaxation evidencing its local nature but also the presence of a certain complexity of the motion, which supports the idea that this process reflects the motion of a large part of the molecule.

Keywords

, Glass transitions, Entropy, High pressure
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@article{paperid:1041623,
author = {SHarifi, Soheil and Simone Capaccioli and Mauro Lucchesi and Pierangelo Rolla and Daniele Prevosto},
title = {Temperature and pressure dependence of secondary process in an epoxy system},
journal = {Journal of Chemical Physics},
year = {2011},
volume = {134},
number = {4},
month = {January},
issn = {0021-9606},
pages = {44510--44516},
numpages = {6},
keywords = {Glass transitions; Entropy; High pressure},
}

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%0 Journal Article
%T Temperature and pressure dependence of secondary process in an epoxy system
%A SHarifi, Soheil
%A Simone Capaccioli
%A Mauro Lucchesi
%A Pierangelo Rolla
%A Daniele Prevosto
%J Journal of Chemical Physics
%@ 0021-9606
%D 2011

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