Process efficiency and long-term performance of α-tocopherol in film-blown linear low-density polyethylene

Authors

  • Clara Strandberg,

    1. Department of Fibre and Polymer Technology, Royal Institution of Technology, Teknikringen 56-58, S-100 44 Stockholm, Sweden
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  • Ann-Christine Albertsson

    Corresponding author
    1. Department of Fibre and Polymer Technology, Royal Institution of Technology, Teknikringen 56-58, S-100 44 Stockholm, Sweden
    • Department of Fibre and Polymer Technology, Royal Institution of Technology, Teknikringen 56-58, S-100 44 Stockholm, Sweden
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Abstract

α-Tocopherol was compared with a commercial phenolic antioxidant (Irganox 1076) as a long-term and process antioxidant in film-blown and compression-molded linear low-density polyethylene. The antioxidant function of α-tocopherol was high in the film-blown material, especially in the processing, according to oxygen induction time measurements with differential scanning calorimetry. The residual content of α-tocopherol after processing, determined with chromatographic techniques, was less than that of the commercial phenolic antioxidant in both the film-blown and compression-molded materials. The process stabilizing efficiency was nevertheless higher for the material containing α-tocopherol. During the long-term stabilization, the efficiency of α-tocopherol was less than that of the commercial phenolic stabilizer Irganox 1076 in the thin films, according to chemiluminescence and infrared measurements. The long-term efficiency in the compression-molded samples stabilized with α-tocopherol or Irganox 1076 was equally good because of the low loss of both α-tocopherol and Irganox 1076 from the thicker films. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 2427–2439, 2005

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