Abstract
A study has been made of the decomposition of hydroperoxide groups POOH in oxidized PP and PE in an inert atmosphere and under conditions of oxidation at 92 and 114°C. The inhibitor method has been used to measure the rate of initiation by benzoyl peroxide and POOH groups. POOP peroxide groups are formed in addition to POOH during the oxidation of PP and PE at a rate corresponding to the number of chain terminations. Depending on the conditions of oxidation, the quantity of POOH and POOP groups formed is equal to or less than the amount of O 2 absorbed. Two kinds of POOH are formed in PP: groups in blocks that decompose rapidly and individual groups that decompose slowly. It is shown that POOH in PP is induced to decompose under the action of alkyl macroradicals both in an inert atmosphere and also under conditions of oxidation. Quantitative characteristics have been obtained for the thermal and induced decomposition of POOH. The yield of radicals into the volume during the decomposition of block POOH in PP is equal to 0·12 (92, 114°C).
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