Abstract
Poly(3-buten-2-one) (PMVK), poly(4,4-dimethyl-1-penten-3-one) (PBVK), and poly(3-methyl-3-buten-2-one) (PMIK) were irradiated in a dichloromethane solution with 15 ns flashes of 265 nm light. In the case of PMVK, the existence of 1,4-biradical (k=2.5×107 s−1) was shown by transient absorption measurements. In the cases of PBVK and PMIK, the absorption spectra of acyl radicals originating from α-cleavage were detected at the end of each flash. Emission measurements yielded only prompt fluorescence. Kinetic analysis of the decay of the transient recorded with PBVK yielded evidence for the formation of a polymeric acyl radical which decomposed when k=4×106 s−1. For PMIK and 3,3-dimethyl-2-butanone (a model compound) the absorption spectrum of acetyl radical was obtained in the range of (1.5—2.0)×105 s−1.
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Naito, I., Schnabel, W. Laser Flash Photolysis Studies of Some Aliphatic Ketone Polymers and the Model Compound, 3,3-Dimethyl-2-butanone. Polym J 16, 81–88 (1984). https://doi.org/10.1295/polymj.16.81
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DOI: https://doi.org/10.1295/polymj.16.81