Abstract
Temperature modulated differential scanning calorimetry (TMDSC) and dynamic mechanical analysis (DMA) are used to calculate cooperative rearranging region (CRR) average sizes for drawn poly(ethylene terephthalate) (PET) with different draw ratios (λ) ranging from λ=1 to 4, according to Donth’s approach. It is shown for both studies that the CRR size decreases when increases, due to the amorphous phase confinement by the crystals generated during the drawing. However, differences observed between the values calculated from TMDSC and DMA investigations are explained by the differences between a mechanical uniaxial dynamic solicitation (DMA) or a thermal solicitation (TMDSC) in terms of cooperative rearrangements at the glass transition.
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Delpouve, N., Lixon, C., Saiter, A. et al. Amorphous phase dynamics at the glass transition in drawn semi-crystalline polyester. J Therm Anal Calorim 97, 541–546 (2009). https://doi.org/10.1007/s10973-008-9670-2
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DOI: https://doi.org/10.1007/s10973-008-9670-2