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Etude des mécanismes de phototransformation de polymères hydrosolubles en milieux aqueux

Abstract : Photooxidation (lambda> 300 nm) and thermooxidation poly (ethylene oxide) (PEO) and poly (N-vinylpyrrolidone) (PVP) were studied in the solid state and in aqueous solution, using different technical analysis (FTIR, UV-visible, SEC and TOC). The effect of the medium, pH and Fe (III) was examined. PEO degradation in aqueous solution leads to the formation of three products: formate, ester and formic acid from the hydrolysis formates. The dégrdation of PVP is done in two ways. Water guides the oxidation mechanism of PVP but not the PEO. Moreover, the presence of iron accelerates the degradation of PEO chains by cuttings through its effect photoinitiator by * OH radical production, whereas in the case of PVP, iron can direct the degradation mechanism of PVP based its concentration, with a cross-linking mechanism or switching mechanism of channels
Keywords : photooxydation
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  • HAL Id : tel-00717437, version 1

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Fatima Hassouna. Etude des mécanismes de phototransformation de polymères hydrosolubles en milieux aqueux. Chimie organique. Université Blaise Pascal - Clermont-Ferrand II, 2006. Français. ⟨NNT : 2006CLF21702⟩. ⟨tel-00717437⟩

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