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Hardness of polymeric glasses in the TG region: a-Se

Published online by Cambridge University Press:  31 January 2011

S. O. Kasap ,
M. Winnicka  and
S. Yannacopoulos
S. O. Kasap
Affiliation:
Departments of Electrical and Mechanical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada
M. Winnicka
Affiliation:
Departments of Electrical and Mechanical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada
S. Yannacopoulos
Affiliation:
Departments of Electrical and Mechanical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan S7N OWO, Canada
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Abstract

The Vickers hardness number Hv of a typical glassy inorganic polymer, a-Se, is studied as a function of temperature with the heating rate varied as a parameter from 0.032 to 3 °C/min, over two decades. It is shown that Hv(T), as a function of temperature, goes through a sharp drop in the glass transformation region following the similar drop for the shear modulus G(T) reported previously. By defining an empirical glass transition temperature TG at the inflection point of Hv vs T behavior, the heating rate dependence of TG is examined and interpreted via the kinetic structural relaxation model of glass transformation. It is shown that over the temperature range 36–50 °C the rate of structural relaxation processes controlling the mechanical properties obeys an Arrhenius type of temperature dependence with an activation energy ∼2.75 cV/atom. Furthermore, over the temperature range accessed, the structural relaxation rate seems to follow the viscosity-temperature behavior.

Type
Materials Communications
Information
Journal of Materials Research , Volume 3 , Issue 4 , August 1988 , pp. 609 - 612
Copyright
Copyright © Materials Research Society 1988

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References

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