ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Formation of Inhibiting Active Products from Phenolic and Amino Antioxidants. II. Synergistic Interaction of Original and Thermally Treated Inhibitors

I. Gömöry and A. Gőmőryova

Cables and Insulating Materials Research Institute, Bratislava 1

Abstract: The secondary induction period of oxidation of polymers inhibited with phenolic and amino antioxidants indicates that nonvolatile inhibiting active products are formed by oxidative transformations of inhibitors during the primary induction period. The shape of the curves of secondary induction period vs. the time of primary oxidation led to the supposition that the inhibiting active products can be formed by thermal treatment, and that the values of the secondary induction periods are influenced by synergistic interaction of original inhibitors with the products of their thermal degradation. Investigations of inhibiting activity of mixtures of the original and thermally treated inhibitors [2,2'-methylene-bis(4-methyl-6-tert-butylphenol) and N-isopropyl-N'-phenyl-p-phenylenediamine in the polyethylene as polymeric substrate] in various ratios show that while in the case of amino antioxidant, there is a considerable synergistic effect, on the other hand, in the case of phenolic antioxidant the effect is an additive one.

Full paper in Portable Document Format: 265a441.pdf

Chemical Papers 26 (5) 441–444 (1972)