Fractional relaxation and the time-temperature superposition principle |
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Authors: | Dr. W. G. Glöckle Prof. T. F. Nonnenmacher |
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Affiliation: | (1) Department of Mathematical Physics, University of Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany |
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Abstract: | Relaxation processes in complex systems like polymers or other viscoelastic materials can be described by equations containing fractional differential or integral operators. In order to give a physical motivation for fractional order equations, the fractional relaxation is discussed in the framework of statistical mechanics. We show that fractional relaxation represents a special type of a non-Markovian process. Assuming a separation condition and the validity of the thermo-rheological principle, stating that a change of the temperature only influences the time scale but not the rheological functional form, it is shown that a fractional operator equation for the underlying relaxation process results. |
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Keywords: | Rheological models viscoelasticity fractional differentiation non-Debye relaxation thermo-rheological simplicity projection operator |
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