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Dynamics of Structural Recovery and Mechanical Response of Polymeric Liquids Near to the Glass Transition

Published online by Cambridge University Press:  10 February 2011

D. M. Colucci ,
C. R. Schultheisz  and
G. B. Mckenna
D. M. Colucci
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
C. R. Schultheisz
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
G. B. Mckenna
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

Results from the NIST torsional dilatometer have indicated that after a temperature step from equilibrium, the volume (structure) and mechanical response (physical aging) can evolve at different rates, depending on the temperature history. The torsional dilatometer results have been modeled in two ways. First, it was assumed that the volume and mechanical response are governed by different clocks, with the principle of time-aging time superposition employed to evaluate an aging time shift factor atc from the torsional response, which was then compared to a structural shift factor aδ calculated from the evolution of the volume. These results were also investigated using a thermoviscoelastic model based on rational thermodynamics and configurational entropy; this model does not include an explicit assumption of separate time scales, but different time scales for the structure and mechanical properties appear to arise naturally from the formulation. The results from the thermoviscoelastic model show good qualitative agreement with the torsional dilatometer results, although more material data is needed to make an exact comparison.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 407: Symposium M – Disordered Materials and Interfaces-Fractals, structure and Dynamics , 1995 , 227
Copyright
Copyright © Materials Research Society 1996

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References

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