Abstract
The thermal decomposition of t-butyl peroxybenzoate (2a) and t-butyl peroxylaurate (2b) was carried out in 2,4-diphenyl-4-methyl-1-pentene (α-methylstyrene dimer, MSD) at 140°C. Free radicals generated from the peresters were efficiently trapped by MSD through the addition-fragmentation reaction. Benzoyloxy radicals generated from 2a underwent two competitive reactions, i.e., addition to MSD (71%) and decarboxylation (29%). On the other hand, decarboxylation was the sole reaction for lauroyloxy radicals from 2b. For t-butoxy radicals, both results from 2a and 2b were identical, the ratio of addition to MSD/β-scission being 61/39. In the case of 2b, the efficiency of free radical production was significantly lowered by cage reactions.
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Watanabe, Y., Ishigaki, H., Okada, H. et al. Study on Initiation Mechanisms of Peresters Using α-Methylstyrene Dimer (MSD) Trapping Technique. Polym J 29, 603–606 (1997). https://doi.org/10.1295/polymj.29.603
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DOI: https://doi.org/10.1295/polymj.29.603