A series of styrene homopolymers and styrene-butadiene block copolymers of type SB and SBSB in which the sequence length of styrene chromophores has been varied has been studied by time-resolved fluorescence techniques. It has been shown that the kinetic behavior of polystyrene fluorescence cannot be attributed to the existence of kinetically distinct monomeric species. The dual-exponential decays observed in the region of monomer emission are assigned to the influence of quenched monomer and excimer dissociation, respectively. The molar mass dependence of the polystyrene photophysics is best explained by models that assume energy migration to occur within (and, at low molecular weights, to be limited by) the chromophore sequence lengths. © 1983 American Chemical Society.
|Number of pages||5|
|Publication status||Published - 1983|