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Étude de films PA6 et nanocomposites : effet des conditions de procédé et des nanocharges sur la morphologie et les propriétés de sorption à l’eau et à l’éthanol

Abstract : The morphology and water and ethanol sorption properties of thin films made of polyamide 6 were studied in relation to different transformation conditions, namely chill roll temperature (TCR) (50 and 125°C) and stretching ratio (between 6 and 10.8). The influence of nanofillers (montmorillonite (MMT) and zirconium phosphate (ZrP)) was also investigated. It was observed that stretching has no influence on neither the morphology nor the sorption properties in the studied range. In contrast unfilled films prepared at a chill roll temperature of 50°C have a lower amount of g crystalline phase, thinner cristalline lamellae and reduced amorphous phase mobility than films prepared at a chill roll temperature of 125°C. Adding low amounts of MMT at a TCR of 50°C has a remarkable impact on chain mobility, a and g crystalline phase fractions and lamellar orientation whereas the nanoparticules added at a TCR of 125°C only affect the crystalline orientation. Vapor sorption mechanisms were studied for both filled and unfilled films. The sorption isotherm curves were modelled to obtain a deeply understanding of the aggregation phenomena observed at high activity. Modelling of the kinetics was proposed according to Berens and Hopfenberg approach. Coupling the thermodynamics and kinetics of sorption with the morphological data leads to the conclusion that the interfaces between the amorphous and crystalline domains play a critical role on transport properties
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Mathieu Sabard. Étude de films PA6 et nanocomposites : effet des conditions de procédé et des nanocharges sur la morphologie et les propriétés de sorption à l’eau et à l’éthanol. Alimentation et Nutrition. Université Claude Bernard - Lyon I, 2011. Français. ⟨NNT : 2011LYO10061⟩. ⟨tel-00945679⟩

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