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Étude de l'organisation à l'état solide et de la dynamique des chaines polymères dans les nanocomposites polyéthylène/POSS

Abstract : Grafting polyhedral oligomeric silsesquioxanes (POSS) to polymer chains offers a novel avenue to prepare hybrid organic/inorganic nanocomposites. The great advantage of such an approach holds in the very well-defined dimensions of the filler particles(inorganic core: 0.5 nm), in contrast with polymer/clay systems. Polymer/POSS nanocomposites display attractive properties such as significant mechanical reinforcement and increased thermal stability. However, the molecular origins of these enhancements are still an open question. The aim of this work is to describe both bulk organization and molecular motions of the polymer chains within these materials: these molecular properties should lead to a deeper knowledge of the enhancement of the polymer-POSS mechanical properties. The systems investigated are polyethylene (PE)-POSS copolymers with various POSS contents. The (semi-)crystalline behaviour of both PE and POSS particles induces complex bulk organization of these hybrid materials. The combined use of NMR, DSC and X-ray scattering experiments enabled to monitor the variation of the solid-state organization with the filler loading. In the second part of this work, the PE chain dynamics was investigated in the amorphous phase and its variation with the filler content was considered. Lastly, selective NMR experiments were used to probe the PE chain segment mobility close to the POSS nanoparticles
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Domitille Pitard. Étude de l'organisation à l'état solide et de la dynamique des chaines polymères dans les nanocomposites polyéthylène/POSS. Autre. Université Paris-Est, 2008. Français. ⟨NNT : 2008PEST0006⟩. ⟨tel-00461664⟩

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