Abstract
The model reaction for the crosslinking of polyethylene (PE) in the presence of 2,4-diphenyl-4-methyl-1-pentene (α-methylstyrene dimer: MSD) was carried out using n-undecane instead of PE and using di-t-butyl peroxide as an initiator at 140°C. Undecyl radicals produced by hydrogen abstraction by peroxide radicals from n-undecane effectively added to the double bond of MSD to form adduct radicals, which then underwent fragmentation to give olefins and cumyl radicals. The concentration of olefins initially increased, but decreased through a maximum. It was found that the olefins are intermediate products which further react with undecyl radicals, resulting in the formation of compounds with two or three undecyl groups.
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Suyama, S., Ishigaki, H., Watanabe, Y. et al. Mechanism for the Peroxide-Initiated Crosslinking of Polyethylene in the Presence of 2,4-Diphenyl-4-methyl-1-pentene. Polym J 27, 503–507 (1995). https://doi.org/10.1295/polymj.27.503
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DOI: https://doi.org/10.1295/polymj.27.503