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Stretched Exponential Stress Relaxation in a Thermally Reversible, 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, physically associating solution formed from a triblock copolymer in solvent selective for the mid-block was found to be well described over a broad temperature range by a stretched exponential function with a temperature independent ‘stretching exponent’, β ≈ 1/3. This same exponent value has been suggested to have particular significance in describing structural relaxation in a wide range of disordered viscoelastic materials ranging from associating polymer materials (‘gels’) to glass-forming liquids. We quantify the temperature dependence of the high frequency, or short time, shear modulus as function of temperature and find that this property also follows a variation often observed in gels and glass-forming materials.

Keywords

polymerself-assemblystress/strain relationship
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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