Preparation and properties of polymer networks from photoperoxidation of 1,2-dicarbonyl compounds

Abstract : Benzil (BZ) pendant groups of styrene copolymers were converted almost quantitatively into benzoyl peroxide (BP) by irradiation of solid polymer films at λ > 400 nm. Thermal or photochemical decomposition of BP is an efficient way to obtain a 3D network of crosslinking. Final networks from photo-crosslinking and thermo-crosslinking are similar. Final networks were characterized by rheology (Winter-Chambon, Cole-Cole, theoretical model), swelling, thermoporometry and densitometry. A correlation between results of various methods and number of BP groups per chain was established. The factors supporting a the construction of a dense network are: high molar masses and low polydispersities of original copolymer and high concentration of BP. The efficiency of crosslinking of a copolymer bearing camphorquinone pendant group is significantly lower.
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Branislav Husar. Preparation and properties of polymer networks from photoperoxidation of 1,2-dicarbonyl compounds. Chimie organique. Université Blaise Pascal - Clermont-Ferrand II, 2008. Français. ⟨NNT : 2008CLF21818⟩. ⟨tel-00728255⟩

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