The surface modification of a series of homopolymers is accomplished t
hrough mixing an AB block copolymer, where B is a poly(dimethylsiloxan
e) (PDMS) block and A is the block of the same chemical identity as of
the homopolymers. The homopolymers are polystyrene, poly(alpha-methyl
styrene), and Bisphenol A polycarbonate. The surface composition of PD
MS is measured by angle-dependent electron spectroscopy for chemical a
nalysis (ESCA). The PDMS blocks are segregated in the topmost surface
region and constitute up to 90 wt % of the surface of the AB/A blends,
even though the overall bulk PDMS concentrations of the blends are 6
% or less. The effects of the bulk concentration of the block copolyme
rs, molecular weight, and block copolymer architecture on the surface
composition of the AB/A blends are discussed.