Abstract
The temperature dependence of initiation reactions of t-butoxy, cumyloxy, and benzoyloxy radicals, was studied using 2,4-diphenyl-4-methyl-1-pentene (α-methylstyrene dimer, MSD) as a model compound of styrene and a radical trapping agent. The ratios between addition of the oxy radicals to MSD and their self-decomposition (β-scission or decarboxylation) were found to greatly depend on the reaction temperature. The differences in activation energy between self-decomposition and addition (Ed−Ea) for t-butoxy, cumyloxy, and bezoyloxy radicals were estimated to be 7.8, 7.9, and 5.0 kcal mol−1, respectively. End group ratios (t-butoxy/methyl, cumyloxy/methyl, and benzoyloxy/phenyl) for polystyrene obtained by initiation of the oxy radicals are simulated over the temperature range 50–150°C.
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Watanabe, Y., Ishigaki, H., Okada, H. et al. Temperature Dependence of Initiation Reactions of Oxygen-Centered Radicals. Polym J 29, 693–696 (1997). https://doi.org/10.1295/polymj.29.693
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DOI: https://doi.org/10.1295/polymj.29.693