THE ROLE OF QUINONE METHIDES IN THERMOSTABILIZATION OF HYDROCARBON POLYMERS .2. PROPERTIES AND ACTIVITY MECHANISMS

摘要

Retardation of thermal oxidation by quinone methides (QM) was observed in model experiments with liquid hydrocarbons. The retardative effect decreases with increasing temperature. Long-term heat ageing of polypropylene is more efficiently reduced by phenolic antioxidants prone to form the corresponding QM in situ. Potential mechanistic features involving reactivity of QM with free radicals, hydroperoxide decomposing antioxidants and hindered amines are reviewed from the point of view of thermal processes in polyolefins. (C) 1996 Elsevier Science Limited [References: 31]