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Predictions of a Thermoviscoelastic Constitutive Equation for Specific Volume Relaxation in the Glass Transition Region

Published online by Cambridge University Press:  16 February 2011

Dong-Ik Song  and
James M. Caruthers
Dong-Ik Song
Affiliation:
Purdue University, School of Chemical Engineering, West Lafayette, IN 47907
James M. Caruthers
Affiliation:
Purdue University, School of Chemical Engineering, West Lafayette, IN 47907
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Extract

Relaxation in the glass transition region is very important to the understanding of the mechanical properties of polymers. Both (i) traditional viscoelastic behavior resulting from application of a mechanical stress or strain and (ii) volume relaxation due to the temperature or pressure change. Structural relaxation near the glass transition region has mostly been probed via isothermal volume recovery after a step change in temperature. Key features of the isothermal volume recovery are well known and include (i) nonlinearity of the kinetics in terms of the magnitude of the initial departure from equilibrium, (ii) asymmetry of the relaxational behavior with respect to the sign of the temperature perturbation and (iii) memory effects related to the thermal history and physical aging.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 215: Symposium R2 – Structure, Relaxation and Physical Aging of Glassy Polymers , 1990 , 213
Copyright
Copyright © Materials Research Society 1991

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