Etude de la formation de réseaux polyuréthane au sein de films multicouches

Abstract : Magnetic tapes are multilayer assemblies using polyurethane networks. These organic materials are used as a protective coating containing pigments or as a binder ensuring the cohesion of the magnetic charges used for the information coding. Among the defects, the appearance of which requires a better chemical reactions involved in these assemblies development understanding, an excessive adhesion development between the strips and PVC plates which can lead to degradation by tearing been targeted for this study.The reaction conditions influence (atmosphere, temperature and alcohol / isocyanate molar ratios) on the crosslinking kinetics of model polyurethane systems made it possible to quantify the residual reactive species at the network formation end and to prove the isocyanate functions involvement in side reactions, and their reactivity inhibition when the reactions are not conducted under inert conditions. The water presence in the reaction environment was related to the isocyanate functions involvement in the urea bonds formation. Finally, the model assemblies realization did not make it possible to reproduce the stripping but the assemblies provided by the industrialist study suggests that the process used for the protective layer shaping is the defect cause.
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Julie Floch. Etude de la formation de réseaux polyuréthane au sein de films multicouches. Chimie organique. Normandie Université, 2019. Français. ⟨NNT : 2019NORMC208⟩. ⟨tel-02310711⟩

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