Photophysical and Solution Properties of Naphthalene-Labeled Styrene/N,N-Dimethyl Maleimido Propylammonium Propane Sulfonate Copolymer

The photophysical and solution properties of naphthalene-labeled styrene/ N, N -dimethyl maleimido propylammonium propane sulfonate copolymer, poly(SDMPAPS)/NA, were studied in terms of fluorescence, cloud point, and viscosity measurements. The ratio of intensities of the excimer and monomer fluorescence ( I E / I M ) was shown as a function of polymer concentration in deionized water. The value of I E / I M decreases with an increase in the salt concentration. The addition of anionic surfactants to the aqueous solution of poly(SDMPAPS)/NA can either induce or break the interpolymer aggregation. When the electrolyte concentration increases, the Stern−Volmer quenching constant ( K sv ) also increases. The phase behavior of poly(SDMPAPS)/NA shows an upper critical solution temperature around 17 °C. The intrinsic viscosity of the poly(SDMPAPS)/NA in the presence of different salts reflects the influence of these salts on the hydrodynamic volume of the polymer chain for poly(SDMPAPS)/NA. A model of the interaction between poly(SDMPAPS)/NA and surfactant in aqueous solution is proposed.