Inhibition of Polyethylene and Polypropylene Oxidation
by Nitro Compounds Reacting with Alkyl and Peroxy Radicals

Yu. B. Shilov and E. T. Denisov

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia

Received November 25, 1999

Abstract—The kinetics of chain termination in polypropylene and polyethylene oxidation inhibited by 2,4-
dinitrololuene is studied. 2,4-Dinitrololuene inhibits the oxidation of polyethylene and polypropylene lacking
hydroperoxide groups by terminating chains in the reaction with alkyl macroradicals. In oxidized polypropy-
lene containing hydroperoxide groups, chain termination on 2,4-dinitrololuene involves both alkyl and peroxy
radicals. A cyclic mechanism is proposed for chain termination in partially oxidized polypropylene involving
and nitroxyl radicals formed from 2,4-dinitrololuene.

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