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- W1968071551 abstract "The segmental relaxation in poly(vinyl acetate) (PVAC) has been studied through the determination of the isobaric dynamic heat capacity: Cp∗(ω,T)=Cp′(ω,T)−iCp″(ω,T). The calorimetric measurements have been performed over a very low frequency range from 1 to 20 mHz using ac calorimetry. The real and imaginary parts of Cp∗(ω,T) at constant frequency reflect the α relaxation associated with the glass transition, but a low signal to noise ratio and/or some small unwanted contribution distorts the thermal behaviour of the imaginary component. In this work, we show that in order to estimate a suitable thermal dependence of the imaginary part an approximated method, tested before by means of dielectric relaxation spectroscopy (DRS) measurements, can be applied. A comparative analysis of the calculated effective relaxation time and the peak width has been performed with respect to the reported data, measured by both the specific heat spectroscopy (SHS) and modulated DSC (TMDSC) techniques, and DRS." @default.
- W1968071551 created "2016-06-24" @default.
- W1968071551 creator A5010090365 @default.
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- W1968071551 date "2003-06-01" @default.
- W1968071551 modified "2023-10-18" @default.
- W1968071551 title "Dynamic heat capacity in the α relaxation process of poly(vinyl acetate) at low frequency" @default.
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- W1968071551 doi "https://doi.org/10.1016/s0040-6031(02)00574-9" @default.
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