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• W1508210605 abstract "Using fixed-angle ellipsometry we investigate the degree of mass transfer upon vertically dipping a polystyrene surface through a layer of a polystyrene-poly(ethylene oxide) (PS-PEO) block copolymer at the air-water interface (Langmuir-Blodgett or LB transfer). The transferred mass is proportional to the PS-PEO grafting density at the airwater interface, but the transferred mass is not equal to the mass at the air-water interface. We find that depending on the chain length of the PEO block only a certain fraction of the polymers at the air-water interface is transferred to the solid surface. For the shortest PEO chain length (PS36-PEO148) the mass transfer amounts to 94%, while for longer chain lengths (PS36-PEO370 and PS38-PEO770) a transfer of respectively 57% and 19% is obtained. We attribute this reduced mass transfer to a competition for the PS surface between the PEO block and the PS block. Atomic force microscopy shows that after transfer the material is evenly spread over the surface. However, upon a short heating of these transferred layers (95°C, 5 minutes) a dewetting of the PS-PEO layer takes place. These results have a significant impact on the interpretation of the results in a number of papers in which the above described transfer method was used to produce PEO polymer brushes, in a few cases in combination with heating. We shortly review these papers and discuss their main results in the light of this new information. Furthermore, we show that by using Langmuir-Schaeffer (LS, horizontal) dipping, much higher mass transfers can be reached than with the LB method. When the LB or LS methods are carefully applied, it is a very powerful technique to produce PEO brushes as it gives full control over both the grafting density and the chain length. A manuscript based on this chapter was published as: de Vos, W.M.; de Keizer, A.; Kleijn, J.M.; Cohen Stuart, M.A. Langmuir 2009, 25, 44904497. The production of PEO brushes via Langmuir-Blodgett methods." @default.
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• W1508210605 date "2009-01-01" @default.
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• W1508210605 title "Brushes and particles" @default.
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