Nouveaux polyamphiphiles cationiques : synthèse et étude de leur organisation en milieu aqueux et aux interfaces en relation avec leur structure

Abstract : In order to improve the fundamental knowledge of the relationships between the chemical structure of intramolecular associative polymers (polysoaps) and their physical chemical properties in aqueous media, three new families of cationic amphiphilic polymers were obtained by complementary methods offering great structure variability. The corresponding polymers were comb poly(meth)acrylamides with pendant ammonium groups with alkyl side chains of variable lengths. A first investigation of their physical chemical behaviour in aqueous solutions, by viscometry and fluorescence spectrometry with two complementary fluorescent probes, showed that they displayed polysoap properties which varied progressively with their chemical features, in particular the length of the alkyl side chain, the size of the spacer between the two polar amide and ammonium groups and the polymer molecular weight. Tensiometry confirmed the prevailing of the hydrophobic effect by showing that these polymers displayed a very weak activity at the water/air interface although the corresponding molecular models showed excellent tensio-active properties. Langmuir's films were eventually obtained in the first study of this importance on cationic amphiphilic polymers. Here again, the great structural variability enabled original observations and new structure/properties relationships were obtained for the corresponding compression isotherms
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Fatiha Bezzaoucha. Nouveaux polyamphiphiles cationiques : synthèse et étude de leur organisation en milieu aqueux et aux interfaces en relation avec leur structure. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL026N⟩. ⟨tel-01752991⟩

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