Abstract
Intramolecular excimer formation has been studied in a series of acenaphthylene-methyl acrylate copolymers. Intramolecular energy migration has been characterized by fluorescence depolarization measurements and is determined by the mole fraction of aromatic in the copolymer. f a . A function Σ generated in terms of the pentad chromophore sequence distribution of the copolymer is used to describe the potential excimer site concentration. It has been demonstrated that in accord with a previous model (Reid and Soutar, J. Polym. Sci. Polym. Lett. 15, 153, 1977, [27]), combination of the terms descriptive of migration and excimer site concentration affords a function descriptive of the excimer emission characteristics of the copolymers. The results confirm that excimer formation in acenaphthylene copolymers is enhanced the greater the degree of substitution in the comonomer. Intramolecular energy migration in glassy solutions of acenaphthylene-methylacrylate copolymers is less extensive (as detected by fluorescence depolarization) than in acenaphthylene-methyl methacrylate copolymers. Such an effect, if valid for fluid solutions, would contribute to the enhanced excimer formation observed in the latter system. Reactivity ratios for acenaphthylene and methyl acrylate in copolymerization at 70°C were 3.19 and 0.13 respectively.
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