Polymérisation en émulsion et en miniémulsion. Influence de la combinaison de stabilisants moléculaires et macromoléculaires et suivi en situ par spectroscopie Raman

Abstract : The aim of this work is to compare processes of emulsion and miniemulsion polymerization. The influence of the combination of molecular and macromolecular stabilizers on the reaction kinetics and particle size distribution are relevant factors in our study. A stabilizer polymer, poly (vinyl alcohol-co-vinyl acetate) (PVA), was synthesized with different degrees of hydrolysis by a direct saponification of polyvinyl acetate. The degree of hydrolysis of this copolymer was characterized by Nuclear Magnetic Resonance (1H NMR). Then, we studied the influence of the composition of a mixture stabilizer [poly (vinyl alcohol-co-vinyl acetate) (PVA)/sodium lauryl sulfate (SDS)], and particulary the degree of hydrolysis of PVA. The presence of complex (PVA/SDS) influences slightly the kinetic of polymerization. The ability of the complexes to stabilize the particles of latex depends on the degree of hydrolysis of PVA, the lower it is, the more the aggregation is important. Finally, we followed in situ emulsion and miniemulsion polymerizations of styrene by Raman spectroscopy. The exploitation of the spectrum allowed us to assign the different peaks to vibrations of certain bands. The consumption of the monomer and the appearance of the polymer could be followed throughout the polymerization
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Itab Youssef. Polymérisation en émulsion et en miniémulsion. Influence de la combinaison de stabilisants moléculaires et macromoléculaires et suivi en situ par spectroscopie Raman. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0191⟩. ⟨tel-01749385⟩

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