SOLUBILIZATION OF HOMOPOLYMERS BY BLOCK-COPOLYMER MICELLES IN DILUTE-SOLUTIONS - LASER-LIGHT SCATTERING AND VISCOSITY STUDIES ON MICELLAR SOLUTIONS

Light scattering and viscosity measurements on micellar solutions of b lock copolymers were carried out in the presence of polyisobutylene. M icelle size and molar mass were determined for micelles of polystyrene -block-poly(ethylene/propylene) in 5-methyl-2-hexanone and 2-pentanone and for micelles of lystyrene-block-poly(ethylene/butylene)-block-pol y styrene in 3-methyl-2-pentanone in the presence of different percent ages of polyisobutylene. As the percentage of homopolymer solubilized in the micellar increases, the size and the aggregation number of the micelles become larger. The temperature effect on micellar solutions w as also studied. The presence of homopolymer in the micelle solutions causes the so-called anomalous behavior. This becomes more intense as the molar mass or the percentage of the homopolymer increases.