Viscosity dependence of the excimer to monomer fluorescence ratio. Cyclic and linear polysiloxanes

The fluorescence ratio of poly(methylphenylsiloxane) in THF/dioxane and THF/methanol mixtures was studied as a function of solvent viscosity and polymer-reduced viscosity in order to quantify the relative contribution from each type of excimer, taking into account excimer dissociation of this polymer.