Abstract
The concentration dependence of the characteristic frequency, ΔΓ1(c), for the overall intra- coil relaxation of linear polystyrene in good and theta solvents was determined using photon correlation spectroscopy. This dependence was unusually strong in good solvent and absent in theta solvent. In good solvent, coil–coil collisions, whose frequency depended on concentration, contributed to coil shrinkage and to the interruption of overall intracoil relaxations resulting in an unusually strong concentration dependence for ΔΓ1(c). In marked contrast to the good solvent behavior, coils interpenetrated readily at theta interacting only very weakly and as a result ΔΓ1(c) exhibited little, if any, concentration dependence.
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