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Evaluation of thymolphthalein-grafted graphene oxide as an antioxidant for polypropylene

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2018, 25(1), pp.60-67
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General

Mona Bagheripour-Asl 1 Reza Jahanmardi 1 Hasan Tahermansouri 1 Erfan Forghani 1

1Islamic Azad University

Accredited

ABSTRACT

In the present work, capability of thymolphthalein-grafted graphene oxide, which was suc\-cessfully synthesized in this study, in stabilization of polypropylene against thermal oxida\-tion were investigated and compared with that of SONGNOX 1010, a commercially used phenolic antioxidant for the polymer. The modified graphene oxide were incorporated into polypropylene via melt mixing. State of distribution of the nanoplatelets in the polymer ma\-trix was examined using scanning electron microscopy and was shown to be homogeneous. Measurements of oxidation onset temperature and oxidative induction time revealed that thymolphthalein-grafted graphene oxide modifies thermo-oxidative stability of the polymer in the melt state remarkably. However, the efficiency of the nanoplatelets in stabilization of polypropylene against thermal oxidation in melt state was shown to be inferior to that of SONGNOX 1010. Furthermore, oven ageing experiments followed by Fourier transform infrared spectroscopy showed that the modified graphene oxide improves thermo-oxidative stability of the polymer strongly in the solid state, so that its stabilization efficiency is com\-parable to that of SONGNOX 1010.

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