Abstract: A series of five acridan derivatives was studied as antioxidants in the thermoxidation of polypropylene. None induced major retardation in the polymer oxidation. Two of them, 9,9-diphenyl- and 9,9-dimethyl-acridans, showed synergism when used in the presence of dilauryl thiodipropionate (DLTP). In order to understand the role of the intermediate nitroxides during the oxidation, 9,9-diphenylacridan-1-oxyl was prepared and studied in the presence and in the absence of DLTP. The main reactivity of the nitroxide is explained through disproportionation and hydrogen abstraction reactions and formation of alkylated hydroxylamine, where the alkyl group is the polymer chain.
Aromatic Secondary Amines as Antioxidants for Polyolefins. Part 1. 9,10-Dihydroacridine (Acridan) Derivatives / Carloni, Patricia; L., Greci; A., Mar'In; Stipa, Pierluigi. - In: POLYMER DEGRADATION AND STABILITY. - ISSN 0141-3910. - 44 (2):(1994), pp. 201-209.
Aromatic Secondary Amines as Antioxidants for Polyolefins. Part 1. 9,10-Dihydroacridine (Acridan) Derivatives
CARLONI, PATRICIA;STIPA, Pierluigi
1994-01-01
Abstract
Abstract: A series of five acridan derivatives was studied as antioxidants in the thermoxidation of polypropylene. None induced major retardation in the polymer oxidation. Two of them, 9,9-diphenyl- and 9,9-dimethyl-acridans, showed synergism when used in the presence of dilauryl thiodipropionate (DLTP). In order to understand the role of the intermediate nitroxides during the oxidation, 9,9-diphenylacridan-1-oxyl was prepared and studied in the presence and in the absence of DLTP. The main reactivity of the nitroxide is explained through disproportionation and hydrogen abstraction reactions and formation of alkylated hydroxylamine, where the alkyl group is the polymer chain.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
