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Study of the mechanism of action of metallic active oxygen barriers applied in polymers for food and drinks preservation

Abstract : Plastics are becoming the most used material for food and drinks preservation. Despite their numerous advantages (transparency, price, modularity, gas barrier property), their oxygen barrier properties have to be improved to avoid hazardous oxidation reactions to foods and drinks and so to increase their shelf-life. One alternative to solve this problem is to combine polymers and metal catalysts to scavenge oxygen. This possible strategy was investigated during this Ph.D. project. After a first introductive chapter, the second depicts the physico-chemical properties of selected metal catalysts (stability, protonation constants, complexation constants towards cobalt(II) and manganese(II), oxygenation capacity, electrochemistry). The third chapter is devoted to their use as powerful oxidant of organic substrate. Finally, the last chapter is dedicated to a solid-state study of polymer oxidation in the presence of metal catalysts. A large part of this last chapter has been devoted to the thorough elucidation of the nature/structure of the oxidized product(s).
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Angéline Cherbonnel. Study of the mechanism of action of metallic active oxygen barriers applied in polymers for food and drinks preservation. Analytical chemistry. Université de Strasbourg, 2018. English. ⟨NNT : 2018STRAF017⟩. ⟨tel-02918123⟩

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