Abstract
Poly(methyl methacrylate) and polystyrene particles stabilized in n-heptane, Freon 113 (1,1,2-trichloro-1,2,2-trifluoroethane) and silicone fluid by AB block copolymers of polystyrene and poly(dimethyl siloxane) have been studied using small angle neutron scattering. Particle sizes calculated from the scattering intensity are in reasonable agreement with particle diameters estimated from electron micrographs. The intensity of scattering from poly(methyl methacrylate) particles stabilized with copolymers containing A blocks prepared from perdeuterostyrene was much higher than from polystyrene particles stabilized with the same block copolymers. It is proposed that the polystyrene blocks are molecularly dispersed in polystyrene particles and cluster into domains in poly(methyl methacrylate) particles. Scattering arising from the poly(dimethyl siloxane) blocks has been detected but could not be simply interpreted.
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