Abstract
The behaviors of free radicals produced by ball-milling of solid polypropylene (PP mechano-radicals) were studied by ESR and compared with those of radicals produced by γ-irradiation (γ-radicals). The mechano-radicals were found to react more efficiently than the γ-radicals with oxygen as well as with the bulky molecule, methyl methacrylate. The peroxy mechano-radicals, which were formed by reaction of the mechano-radicals with oxygen, were very mobile and decayed more readily than the peroxy γ-radicals. The photochemical reaction of the peroxy mechano-radicals was studied, and the radicals produced by illumination of the peroxy mechano-radicals returned to the peroxy radical at 10−4 Torr by consuming the sorbed oxygen. From these experimental results the conclusion is drawn that the PP mechano-radicals were produced and trapped on the fresh surfaces created by fractures of solid polypropylene.
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Kurokawa, N., Sakaguchi, M. & Sohma, J. Trapping Sites of Polypropylene Mechano-Radicals. Polym J 10, 93–98 (1978). https://doi.org/10.1295/polymj.10.93
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DOI: https://doi.org/10.1295/polymj.10.93