Abstract
This paper presents results of steady state fluorescence spectra measurements on polyindene (PIN) and polyacenaphthylene (PAN) samples of different molecular weights, in dilute solution at constant temperature, 25 °C. Solvents were prepared by mixing a solvent and a precipitant in different proportions. Large changes in the size of the particles in solution (determined by turbidimetric methods) caused by incipient phase separation were necessary to produce significant changes of the excimer to monomer fluorescence ratio for both PIN and PAN. A linear relationship between the excimer to monomer fluorescence ratio and the volume of the polymer aggregates is found. Such a relationship is solvent viscosity independent. Several conclusions are drawn about the phase separation process in very dilute polymer solutions.
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