Abstract
The micellar phenomenon of block copolymers in selective solvents has been observed analogous to the classical surfactants. Spherical polymolecular micelles of block copolymers consisting of a core of insoluble block surrounded by the fringes of the soluble block have been analysed. The micellar behaviour of several styrene—isoprene two-block copolymers in two kinds of solvents, (i) selectively good solvent for polystyrene, e.g. dimethylformamide (DMF), dimethylacetamide (DMA), methyl ethyl ketone (MEK) and (ii) selectively good solvent for polyisoprene, e.g. n-alkanes (heptane, octane, decane and dodecane), has been examined by photon correlation spectroscopy (PCS), viscosity data and NMR. Polymolecular micelles with a narrow size distribution and having a size of several nanometers were detected from PCS data. The size and aggregation number of the micelles largely depended upon the molecular characteristics (total molecular weight and the block composition) of the copolymer. The formation of micelles in different solvents has been interpreted in terms of solubility parameters. The influence of temperature and the formation of mixed micelles have also been examined.
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