Abstract: The thermoxidation of polypropylene (PP) at 200 degrees C in the presence of phenothiazine (1) and 3,7-di-tert-butylphenothiazine (2) was studied by measuring the oxygen consumption. The rate of oxygen consumption during the induction period passes through a minimum when the antioxidant concentration increases. Both compounds studied have the same critical concentrations but at high concentrations 2 is more efficient than 1. The results obtained may be explained by the differences in the evaporation rate of 1 and 2 during oxidation. ESR signals of radicals originating from 1 and 2 after polymer oxidation at 160 degrees C were observed.
Aromatic Secondary Amines as Antioxidants for Polyolefins. Part 2: Phenothiazines / Greci, L; Marin, A; Stipa, Pierluigi; Carloni, Patricia. - In: POLYMER DEGRADATION AND STABILITY. - ISSN 0141-3910. - 50 (3):(1995), pp. 305-312.
Aromatic Secondary Amines as Antioxidants for Polyolefins. Part 2: Phenothiazines
STIPA, Pierluigi;CARLONI, PATRICIA
1995-01-01
Abstract
Abstract: The thermoxidation of polypropylene (PP) at 200 degrees C in the presence of phenothiazine (1) and 3,7-di-tert-butylphenothiazine (2) was studied by measuring the oxygen consumption. The rate of oxygen consumption during the induction period passes through a minimum when the antioxidant concentration increases. Both compounds studied have the same critical concentrations but at high concentrations 2 is more efficient than 1. The results obtained may be explained by the differences in the evaporation rate of 1 and 2 during oxidation. ESR signals of radicals originating from 1 and 2 after polymer oxidation at 160 degrees C were observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
