Polymeric and Polymerizable Surfactants

Temperature effect on the viscosity behaviour of dilute solutions of several styrene-butadiene two block copolymers in good and selective solvents was examined. Micelles formed by the block copolymers in solvents selectively good for polystyrene viz. dimethylformamide (DMF), dimethylacetamide (DMA), methyl ethyl ketone (MEK) and selectively good for polybutadiene viz. n-alkane (heptane, octane, decane, and dodecane) were characterized from viscosity, photon correlation spectroscopy, and electron microscopy. The micelle size is discussed in relation to the block copolymer characteristics, solvent selectivity, and temperature.