Abstract
Dielectric relaxation data on amorphous poly(ethylene terephthalate) (PET) from the literature have been analysed within the framework of the mode-coupling theory (MCT). The critical temperature, T c, was determined to be 355 ± 2 K, in agreement with earlier studies. The spectra give evidence for a dependence on temperature that differs above and below T c; for T > T c, the β-minimum is well described by the idealised A 2-version of the MCT, yielding an exponent parameter, λ=0.82. Below T c, the lower frequency part of the β-peak shows a crossover between two different power laws, in qualitative agreement with MCT predictions. In this temperature range both the idealized and extended A 2-MCT fail to fit the data. We argue that the dielectric spectrum is distorted by an A 3 singularity, and by applying the MCT with the A 3 scenario, quantitative agreement between theory and experiment is found over a wide frequency range for all temperatures available.
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