Dynamics of poly(ethylene oxide)-polystyrene (PEO-PS) brushes with shorter
anchoring PEO blocks adsorbed on a flat surface are considered theoreticall
y. 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 coup
led to a two;dimensional microdomain structure, which is presumably formed
by PEG. 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 scatterin
g intensity and slow dynamics at high wavenumbers.