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Glass Transition and Ultrasonic Relaxation in Polystyrene

Published online by Cambridge University Press:  10 February 2011

A. Sahnoune  and
L. Piché
A. Sahnoune
Affiliation:
National Research Council Canada, Industrial Materials Institute, 75, de Mortagne, Boucherville, Québec J4B 6Y4 CANADA, abdelhadi.sahnoune@nrc.ca
L. Piché
Affiliation:
National Research Council Canada, Industrial Materials Institute, 75, de Mortagne, Boucherville, Québec J4B 6Y4 CANADA, abdelhadi.sahnoune@nrc.ca
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Abstract

We present measurements of the glass transition and the ultrasonic relaxation modulus in a series of monodisperse polystyrenes. The temperature dependence of the modulus was analyzed using Havriliak-Negami relaxation model (HN) and Vogel-Tammann-Fulcher equation (VTF) for the relaxation time. The results allowed us to determine the fragility index, m, which decreases with increasing molecular weight, M n . Furthermore, the relaxation time was found to saturate at high molecular weights and varies as M n p , in the low molecular weight region. The exponent is p≈2 at high temperatures and p ≈ 7 at low temperatures close to T g.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 183
Copyright
Copyright © Materials Research Society 1997

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References

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