Abstract
Anomalous production of free radicals with increasing temperature in the range from 100°K to 173°K was observed in the decay process of the polypropylene mechano-radical produced by sawing in liquid nitrogen. It was experimentally demonstrated that this anomalous production of radicals at such low temperatures resulted from the excess electric charge due to the triboelectricity and from the oxygen dissolved in the liquid nitrogen. The reaction scheme for the radical production in this temperature range is presented as the formation of a peroxy radical from the carbanion produced by attachment of the excess electrons to the mechano-radical.
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Sakaguchi, M., Sohma, J. Anomalous Decay Behavior of the Polypropylene Radicals Produced by Mechanical Fracture: Effect of the Excess Charges Due to Triboelectricity. Polym J 7, 490–497 (1975). https://doi.org/10.1295/polymj.7.490
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DOI: https://doi.org/10.1295/polymj.7.490