Etude systématique des «microémulsions;» obtenues avec des copolymères séquencés poly(vinyl-2 pyridine)/poly(oxyéthylène), 1. Domaine d'existence; Nature et composition des phases continue et dispersée
✍ Scribed by Marie, Pascal ;Gallot, Yves
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1984
- Weight
- 677 KB
- Volume
- 185
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
A systematic investigation of transparent systems ("polymeric microemulsions"), obtained with amphiphilic block copolymers in the presence of water, toluene, and alcohol, was carried out. Their domain of existence in the pseudo-ternary phase diagram is limited compared to that observed for microemulsions with classical surfactants and located in the vicinity of the miscibility curve of the ternary solvents mixture. From dialysis equilibrium and viscosity measurements, it has been established that, whatever the respective lengths of the sequences are, these stable systems consist of a dispersed "phase"containing the copolymer moleculessurrounded by a continuous "phase". Both "phases" are composed of a mixture of the three considered solvents, the continuous phase being constituted by a ternary solvent mixture located on the mutual solubility curve. As a consequence, all water or oil is not trapped within the dispersed particles as in the case of classical microemulsions, but there is a preferential absorption of the solvents by each type of blocks of the copolymer. *) Nom systkmatique: poly(pyridy1-2 kthyltme).