DISPLACEMENT OF ADSORBED FUNCTIONALIZED POLYSTYRENE-BLOCK-BUTADIENE COPOLYMERS BY SMALL MOLECULES

This work deals with the displacement of end-anchored copolymers by th e addition of solvent displacer. The adsorption behavior of functional ized polystyrene-block-polybutadiene diblock copolymers from dilute so lution in toluene using silicon wafers as solid substrates is investig ated by means of null-ellipsometry. The desorption phenomena are obser ved by adding displacers of low molecular weight to the mixture. The d isplacers used are tetrahydrofuran (THF) and acetone. The critical com position of the binary solvent mixture at which the desorption is comp lete, is determined experimentally.