Antioxidant
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Definition:
Additive to prevent degradation of plastics from exposure to the atmosphere. Deterioration may be caused by heat, age, radiation, chemicals or physical stress. Compounds which prevent oxygen from reacting with other compounds that are susceptible to oxidation. They are often themselves oxidized in the process of protecting other compounds. There are two main classes of antioxidants: (1) Those that inhibit oxidation through reaction with chain-propagating radicals (radical or chain terminators), such as hindered phenols or secondary aryl amines which intercept either the R· or RO·2 free radicals. These also are referred to as primary antioxidants or free radical scavengers. (2) Those mat decompose peroxide into nonradical and stable products such as esters of thiodipropionic acid. These also are referred to as secondary antioxidants, synergists, or peroxide decomposers.
Definition Copyright ©1989 CRC Press LLC. All rights
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