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Confinement and distribution of the composition in semicrystalline/amorphous miscible blends of PEKK/PEI: a calorimetry study

Abstract : By combining small-angle X-ray scattering and differential scanning calorimetry measurements, we analyze the widening of the glass transition measured for miscible mixtures of semicrystalline PEKK chains and fully amorphous PEI chains. The calorimetric analysis reveals that the amorphous interlamellar phase is subject to confinement effects. In addition, we measure wide composition distributions for the amorphous interlamellar and interfibrillar phases. We quantitatively identify, through careful analysis of the signals, the fraction and average composition of each amorphous phase and the composition distribution. We conclude that the final distribution of the polymer chains that do not crystallize in the interlamellar and interfibrillar phases results from the crystallization dynamics of the mixtures.
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https://hal-espci.archives-ouvertes.fr/hal-03324936
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Submitted on : Tuesday, August 24, 2021 - 10:52:04 AM
Last modification on : Tuesday, November 22, 2022 - 2:26:16 PM
Long-term archiving on: : Friday, November 26, 2021 - 9:25:15 AM

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Aude Belguise, Sabine Cantournet, Victor Fabre, Karine Le Gorju, Valérie Gaucher, et al.. Confinement and distribution of the composition in semicrystalline/amorphous miscible blends of PEKK/PEI: a calorimetry study. Macromolecules, 2021, 54 (16), pp.7364-7376. ⟨10.1021/acs.macromol.1c00344⟩. ⟨hal-03324936⟩

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