Efficiency of curcumin, a natural antioxidant, in the processing stabilization of PE

Concentration effects

Balázs Kirschweng, Dóra Tátraaljai, E. Földes, B. Pukánszky

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The stabilising efficiency of curcumin was studied in polyethylene during processing and under oxygen at high temperature. The effect of the natural antioxidant was investigated at concentrations of 0-1000 ppm in combination with a phosphonite secondary antioxidant (Sandostab P-EPQ) of 1000 and 2000 ppm, respectively. The polymer was homogenized with the additives then processed by six consecutive extrusions taking samples after each processing step. The samples were characterized by FT-IR spectroscopy, melt flow index, colour, and OIT measurements. Compared to the effect of pure phosphorous antioxidant, the melt stability of PE is increased already at 5 ppm curcumin content. The melt as well as the high temperature oxidative stability (OIT) of the polymer are controlled by both types of antioxidants. Curcumin hinders the oxidation of polyethylene and the formation of long chain branches during processing, which can be attributed to the fact that curcumin is not only a hydrogen donor but its unsaturated linear moiety can also scavenge alkyl and oxygen centred macroradicals. Curcumin discolours polyethylene already at small concentrations but the colour fades with increasing number of extrusions.

Original languageEnglish
Pages (from-to)17-23
Number of pages7
JournalPolymer Degradation and Stability
Volume118
DOIs
Publication statusPublished - Aug 1 2015

Fingerprint

Curcumin
antioxidants
Antioxidants
Stabilization
stabilization
Polyethylenes
polyethylenes
Polyethylene
Processing
Extrusion
Color
Polymers
color
Oxygen
polymers
oxygen
Infrared spectroscopy
Hydrogen
Oxidation
Temperature

Keywords

  • Curcumin
  • Natural antioxidant
  • Phosphonite
  • Polyethylene
  • Stabilisation

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Efficiency of curcumin, a natural antioxidant, in the processing stabilization of PE : Concentration effects. / Kirschweng, Balázs; Tátraaljai, Dóra; Földes, E.; Pukánszky, B.

In: Polymer Degradation and Stability, Vol. 118, 01.08.2015, p. 17-23.

Research output: Contribution to journalArticle

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