Abstract
An algorithm for the calculation of discrete, logarithmic equidistant retardation spectra from creep or recovery is applied to experimental data in different regions of consistency. Spectra in the glass-rubber transition region are given for technical poly(styrene), poly(methylmethacrylate), and poly(carbonate) as well as the course of all characteristic compliance type functions. The spectrum in the terminal region of a poly(styrene) of narrow molecular weight distribution is calculated both from creep and recovery data. The course of the dynamic moduli calculated from the spectra and by direct conversion is found in excellent agreement to measurements by means of a dynamic viscometer.
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Dedicated to Prof. Dr. H. Janeschitz-Kriegl at the occassion of his 70th birthday.
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Kaschta, J., Schwarzl, F.R. Calculation of discrete retardation spectra from creep data — II. Analysis of measured creep curves. Rheol Acta 33, 530–541 (1994). https://doi.org/10.1007/BF00366337
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DOI: https://doi.org/10.1007/BF00366337