Abstract
A series of poly(methyl methacrylate-co-methacrylophenone) copolymers were photolyzed in fluid solution with 313-nm radiation. Apparent quantum yields of degradation increased from 0.001 to 0.083 as the ketone content of the copolymers increased from 1.0 to 37.7 mol %. The magnitudes of these quantum yields are considerably lower than those previously reported for other methyl methacrylate-ketone copolymers. The depolarization of phosphorescence following excitation with plane-polarized light in 77 K solid solutions was measured as a function of copolymer composition. Results indicate that intramolecular energy transfer is a facile process in these systems. Migration of the excitation energy seems to be more dependent upon non-nearest-neighbor contacts between the ketone units than upon their presence in either dyad or triad sequences. 4 figures, 3 tables.
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