Abstract
Plots of the progress of the degradation of poly(phenyl vinyl ketone) as a function of irradiation time are nonlinear; the effect is the result of triplet quenching by unsaturated end groups generated in the reaction. The process in intramolecular, and from a study of polymers of different initial chain length and application of random walk theory for a one-dimensional lattice it is possible to determine the frequency of triplet energy hopping; the value obtained was approx. 1 x 10/sup 12/s/sup -1/ at 30/sup 0/C in benzene. Poly(phenyl vinyl ketone) has a critical chain length of 750 units, this being the average number of chromophores visited by the excitation during the triplet lifetime.
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