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Relaxation Behavior in Polystyrene Near and Above the Glass Transiton Studied by Ultrasonic Technique

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
L. Piché
Affiliation:
National Research Council Canada, Industrial Materials Institute, 75, De Mortagne, Boucherville, Québec J4B 6Y4 CANADA
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Abstract

We report measurements of the temperature and pressure dependence of ultrasonic modulus in polystyrene between 340 and 550 K and applied pressures up to 775 bar. The real and imaginary parts of the modulus are analyzed within the Havriliak-Negami model and very good agreement is found over the entire temperature and pressure ranges. Using the Vogel-Tammann-Fulcher equation for the relaxation time, the Kauzmann temperature TK and the fragility parameter D of polystyrene were determined. The value of D indicates that polystyrene is a fragile-glass former.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 407: Symposium M – Disordered Materials and Interfaces-Fractals, structure and Dynamics , 1995 , 173
Copyright
Copyright © Materials Research Society 1996

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References

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