Dynamics of poly(ethylene oxide)−polystyrene (PEO−PS) brushes with shorter anchoring PEO blocks adsorbed on a flat surface are considered theoretically. Three relaxation modes are identified: a fast cooperative (hydrodynamic) mode, a slower drag mode, and the slowest anchor-sliding mode. It is shown that the anchor mode is likely to be dominant and that it is strongly coupled to a two-dimensional microdomain structure, which is presumably formed by PEO. A scaling picture of pattern formation on the adsorbing surface is developed. The theory yields an interpretation of existing evanescent-wave dynamic light-scattering data. The PEO pattern gives rise to high scattering intensity and slow dynamics at high wavenumbers.
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Semenov et al. (1999) studied this question.
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