Chemical analysis and aqueous solution properties of Charged Amphiphilic Block Copolymers PBA-b-PAA synthesized by MADIX

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dc.creatorJacquin, M.
dc.creatorMuller, P.
dc.creatorTalingting-Pabalan, R.
dc.creatorCottet, H.
dc.creatorBerret, J. -F.
dc.creatorFutterer, T.
dc.creatorTheodoly, O.
dc.date2007-08-27
dc.date.accessioned2026-07-07T08:25:52Z
dc.date.available2026-07-07T08:25:52Z
dc.descriptionWe have linked the structural and dynamic properties in aqueous solution of amphiphilic charged diblock copolymers poly(butyl acrylate)-b-poly(acrylic acid), PBA-b-PAA, synthesized by controlled radical polymerization, with the physico-chemical characteristics of the samples. Despite product imperfections, the samples self-assemble in melt and aqueous solutions as predicted by monodisperse microphase separation theory. However, the PBA core are abnormally large; the swelling of PBA cores is not due to AA (the Flory parameter chiPBA/PAA, determined at 0.25, means strong segregation), but to h-PBA homopolymers (content determined by Liquid Chromatography at the Point of Exclusion and Adsorption Transition LC-PEAT). Beside the dominant population of micelles detected by scattering experiments, capillary electrophoresis CE analysis permitted detection of two other populations, one of h-PAA, and the other of free PBA-b-PAA chains, that have very short PBA blocks and never self-assemble. Despite the presence of these free unimers, the self-assembly in solution was found out of equilibrium: the aggregation state is history dependant and no unimer exchange between micelles occurs over months (time-evolution SANS). The high PBA/water interfacial tension, measured at 20 mN/m, prohibits unimer exchange between micelles. PBA-b-PAA solution systems are neither at thermal equilibrium nor completely frozen systems: internal fractionation of individual aggregates can occur.
dc.description32 pages, 16 figures and 4 tables submitted to Journal of Interface and Colloidal Science
dc.identifierhttps://arxiv.org/abs/0708.3596
dc.identifierhttp://arxiv.org/abs/0708.3596
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/136763
dc.subjectSoft Condensed Matter
dc.titleChemical analysis and aqueous solution properties of Charged Amphiphilic Block Copolymers PBA-b-PAA synthesized by MADIX
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