Micellisation de copolymères séquencés polystyrène-polyvinylpyridinium, 2. Influence des caractéristiques moléculaires des copolymères

The influence of the molecular characteristics of polystyrene-poly(4-vinyl-N-ethylpyridinium bromide) block copolymers (PS-PVPQ) on their dilute solution properties is investigated in a solvent selective for polyelectrolytic moieties (water-methanol-0,1 mol/1 LiBr mixtures). It is shown that the association degree depends much more upon the length of the insoluble hydrophobic part of the macromolecule than on the length of the soluble hydrophilic part. Micelle dimensions could not be determined from light scattering measurements because of the compactness of the particles. Attempts for the calculation of micelle size were made using a star-like micellar model.