Influence of ligands in copper complexes on the inhibiting action of their mixtures with amines in oxidation

Influence of Copper on Oxidation of Polyethylene Containing Antioxidants

“…The enhancement of the inhibiting power of amine AO (Neozon D) in the presence of copper(II) stearate was observed previously with liquid hydrocarbons, in particular, n-decane [21323]. Vetchinkina et al [22] suggest two reactions converting AO into a more active product. In the first of them, N-phenyl-2-naphtylamine reacts with copper(II) stearate to form copper(I) complexes with the radical C 10 H 7 N .…”

“…Vetchinkina et al [22,23] believe that just the copper(I) complexes are the effictive inhibitors that suppress PE oxidation after amine AO consumption. If we assume that in the system being oxidized AO is consumed only for the reaction with copper(II) stearate, in the mixture of Neozon D with copper(II) stearate the components should be taken in 2 : 1 molar ratio.…”

Influence of copper stearate on oxidation of polyethylene stabilized with Neozon D

“…Based on this result, Maizus et al suggested [1] that mixtures of variable-valence metal salts with inhibitors of free-radical reactions can be used to develop new antioxidants (AO). This possibility was extensively studied, in particular, in [2,3]. It was found that a Neozon D3copper(II) stearate mixture is rapidly consumed in decane oxidation.…”

“…It was found that a Neozon D3copper(II) stearate mixture is rapidly consumed in decane oxidation. Based on the fact that the induction period of hydrocarbon oxidation (IPO) lasted for a long time after complete consumption of the AO, Vetchinkina et al suggested [2] formation of a new compound inhibiting the oxidation. Two pathways giving rise to a new, more effective AO were proposed [2].…”

“…Based on the fact that the induction period of hydrocarbon oxidation (IPO) lasted for a long time after complete consumption of the AO, Vetchinkina et al suggested [2] formation of a new compound inhibiting the oxidation. Two pathways giving rise to a new, more effective AO were proposed [2]. The first is reaction of N-phenyl-2-naphthylamine with copper(II) stearate to form a copper(I) complex with C 10 H 7 NC 6 H 5 radical and stearic acid.…”