Vitamin e Based Stabilizer Components in HDPE Polymer

Y. C. Ho, S. S. Young, K. L. Yam

Research output: Contribution to journalArticle

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Abstract

The effects of individual components in a vitamin E based antioxidant formulation (CF-120) on off-odor release, melt flow property and yellow color property of HDPE resin pellets were investigated using a three-phase study. The formulation consists of vitamin E, glycerol, polyethylene glycol-400 (PEG-400), and glyceryl monocaprylate/caprate (GMC). The resin pellets were extruded from HDPE resin powder using a laboratory scale single screw extruder. Off-odor release from the resin pellets was evaluated using a sensory panel and GC/MS analysis. Melt flow indices and yellowness indices of the resin pellets were also measured. Screening experiment (Phase I) showed that GMC greatly contributed to off-odor and MFI reduction; vitamin E greatly contributed to yellow color formation. Factorial experiment (Phase II) confirmed that GMC was the major off-odor contributor. Response surface experiment (Phase III) showed that yellowness index and odor score reasonably correlated to vitamin E and GMC concentrations; MFI and nonanal concentration did not correlate well with vitamin E and GMC concentrations. The identification of octanoic acid by GC/MS from HDPE resin pellets suggested that possible thermal/mechanical degradation of GMC might occur in extrusion. The results are useful for designing a better vitamin E formulation for reducing the off-odor, without significantly enhancing yellow color formation.

Original languageEnglish (US)
Pages (from-to)139-150
Number of pages12
JournalJournal of Vinyl and Additive Technology
Volume4
Issue number2
Publication statusPublished - Jun 1 1998

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Polymers and Plastics
  • Marketing
  • Materials Chemistry

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