Fluorescence Spectroscopic Study for Interaction of Pyrene-Labeled Poly(2-acrylamido-2-methylpropane Sulfonates)s Bearing Octadecyl Group with Nonionic Surfactant Molecules

The interactions of the hydrophobically random-modified and end-capped polyanions with a nonionic surfactant were investigated by fluorescence spectroscopy of the labeled Py in the polyanions. The results revealed that the complex formation between these polyanions and the nonionic surfactant took place with two steps; the first step is the insertion of the surfactant molecules into hydrophobic microdomains formed from the polyanions, and the second step is the disruption of the hydrophobic microdomains due to binding the surfactant molecules to the hydrophobic groups of the polyanions. The position of the hydrophobic groups covalently introduced in the polyanions affects the polyanion-surfactant complex formation.