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Mechanistic action of phenolic antioxidants in polymers—A review

1988; Elsevier BV; Volume: 20; Issue: 3-4 Linguagem: Inglês

10.1016/0141-3910(88)90069-9

1873-2321

J. Pospı́šil,

Conducting polymers and applications

Hindered phenols are used as radical scavengers during fabrication, storage, processing and end-use of various polymers. Modern HMW antioxidants have very sophisticated molecular architectures, combining intrinsic chemical activity and the requirements of physical persistence. The mechanism of action has been discussed using the results of the elucidation of the chemical transformations which occur during the stabilisation process. Mechanisms responsible for co-operation phenomena, regenerative processes involved in homo- and heterosynergism, intramolecular co-operation in bifunctional phenolic antioxidants and co-operation pathways between hindered phenols and HALS are shown. Various catalytic species and some pigments are able to induce chemical transformation of hindered phenols and reduce their efficiency.