Forces between End-Adsorbed Triblock Copolymer Chains and a Bare Mica Surface in a Good Solvent
- 21 September 1991
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 16 (4) , 331-335
- https://doi.org/10.1209/0295-5075/16/4/003
Abstract
We have investigated the bridging effects of terminally adsorbed chains by directly measuring the forces between a single adsorbed layer of poly(ethylene oxide)-polystyrene-poly(ethylene oxide) (PEO-PS-PEO) triblock copolymer and a bare mica surface in a good solvent (toluene). We find, as the bare mica surface approaches, clearly detectable long-range attractive forces followed by an attractive minimum and monotonically increasing repulsion at smaller separations. Significant changes in the force-distance profiles with compression-decompression cycles are also observed, which strongly indicate rearrangement of the adsorbed macromolecular chains between the surfaces.Keywords
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