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Stretched Exponential Stress Relaxation in a ThermallyReversible, Physically Associating Block Copolymer Solution

Published online by Cambridge University Press:  21 February 2012

Kendra A. Erk  and
Jack F. Douglas
Kendra A. Erk
Affiliation:
Department of Materials Science & Engineering, Northwestern University, Evanston, IL 60202 Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Jack F. Douglas
Affiliation:
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

The shear stress relaxation of a thermally reversible, physicallyassociating solution formed from a triblock copolymer in solvent selectivefor the mid-block was found to be well described over a broad temperaturerange by a stretched exponential function with a temperature independent‘stretching exponent’, β ≈ 1/3. This same exponent valuehas been suggested to have particular significance in describing structuralrelaxation in a wide range of disordered viscoelastic materials ranging fromassociating polymer materials (‘gels’) to glass-forming liquids. We quantifythe temperature dependence of the high frequency, or short time, shearmodulus as function of temperature and find that this property also followsa variation often observed in gels and glass-forming materials.

Keywords

polymerself-assemblystress/strain relationship

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1418: Symposium LL/MM – Gels and Biomedical Materials , 2012 , mrsf11-1418-ll01-02
Copyright
Copyright © Materials Research Society 2012

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References

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