Abstract
Direct force measurement on the interactions of end-adsorbed diblock and triblock copolymer layers against a bare mica surface in toluene are dreported. Only monotonically repulsive forces are observed when a bare mica sheet interacs with a single layer of polystyrene (PS)-poly(ethylene oxide) (PEO) diblock copolymer, end-adsorbed at a toluene/mica interface. In contrast, clearly detectable attractive forces are found for PEO-PS-PEO triblock copolymers under similar conditions. The attraction is attributed to polymer bridges in which the two PEO end blocks of a single triblock chain simultaneously adsodrb onto opposing mica surfaces
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