Melt stabilisation of Phillips type polyethylene, Part III: Correlation of film strength with the rheological characteristics of the polymer

János Kovács, Piroska Pataki, Ágnes Orbán-Mester, Gábor Nagy, Peter Staniek, Enik Földes, Béla Pukánszky

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Different aspects of the melt stabilising effect of various antioxidant packages were studied in a Phillips type polyethylene in the work described in this series of papers. The polymer was stabilised with various combinations of a phenolic antioxidant with phosphite, phosphonite, and phosphine type secondary antioxidants and processed by multiple extrusions followed by film blowing. After determining the role of the antioxidants in the melt stabilisation process and the effect of antioxidant consumption on polymer properties the correlation of the rheological characteristics of polymer with the tear and impact strengths of films is discussed in this paper. The Elmendorf tear strength of films measured in transverse direction, which is sensitive to long chain branching, correlates closely with viscous compliance determined by creep recovery experiments and the ratio of melt flow indices measured at high and low loads. The relationships are independent of the type and amount of antioxidant added. This makes possible the prediction of the effect of various antioxidant packages on film properties on the basis of rheological measurements. The correlation between the dart drop impact strength of the films and the rheological characteristics of the polymer is less reliable.

Original languageEnglish
Pages (from-to)1771-1779
Number of pages9
JournalPolymer Degradation and Stability
Volume96
Issue number10
DOIs
Publication statusPublished - Oct 1 2011

Keywords

  • Film strength
  • Polyethylene
  • Rheological characteristics
  • Stabilisation

ASJC Scopus subject areas

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

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