Investigation of the Stabilizing Action of Mixtures of Fullerene C60 with Known Antioxidants in the Thermo-oxidative Degradation of Polystyrene

• Published in: International journal of polymeric materials 2001-03, Vol.48 (3), p.251-265
• Main Authors: Troitskii, B. B., Troitskaya, L. S., Anikina, L. I., Denisova, V. N., Novikova, M. A., Khokhlova, L. V.
• Format: Article
• Language: eng ; rus
• ISSN: 0091-4037; 1563-535X
• DOI: 10.1080/00914030108050785

Investigations have been made on the effects of double mixtures of C 60 with well-known antioxidants (amines, phenols, S- and P-containing compounds, Ph 3 Sb) on the thermo-oxidative degradation of PS by DSC method under oxygen. The influence of mixtures on the temperature of the onset of polymer degradation, T 0 , has been studied. The effects of concentration of C 60 on the value of the temperature limit of inhibition of PS thermo-oxidative degradation by known antioxidants, T 0 max , have been investigated. It has been shown that mixtures of C 60 with Ph 3 Sb and phenyl-β-naphthylamine have a synergistic effect upon T 0 . At a total concentration of 1.4 × 10 −2 mol/kg, the maximum value of T 0 is observed at a molar C 60 : compound ratio of 3:4 and 1:2.5 for the mixtures of C 60 with Ph 3 Sb and phenyl-β-naphthylamine, respectively. Addition of C 60 to these compounds leads to an increase in T 0 max for Ph 3 Sb and phenyl-β-naphthylamine. The suggestion was made that in the case of mixtures of C 60 with Ph 3 Sb, the synergistic effect is Associated with different mechanisms of stabilizing action of the components on PS degradation, namely C 60 reacts with alkyl and oxygen-containing radicals with the formation of more stable compounds while Ph 3 Sb decomposes polymeric and fullerene-containing peroxides and hydroperoxides. The decomposition of Ph 3 Sb was investigated by DSC method under oxygen. The temperature of the onset of Ph 3 Sb degradation was shown to be 362.5°C. It was concluded that further investigations are necessary for understanding the synergistic action of mixture of C 60 with phenyl-β-naphthylamine in the thermo-oxidative degradation of PS.