Control of the structure and properties of barium sulphate-filled blends of polypropylene and ethylene propylene copolymers

C. O. Hammer, F. H.J. Maurer, S. Molnár, B. Pukánszky

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The structure and properties of polypropylene (PP) and ethylene propylene copolymer (EPR) blends filled with BaSO4 have been investigated. The aspect of structure control concerned was the separate dispersion of filler and rubber in the PP matrix or encapsulation of the filler in the rubber phase. The former structure prevails in the PP/EPR/BaSO4 systems, and addition of maleic anhydride-grafted polypropylene (MAPP) enhances the adhesion between the PP matrix and the filler. Encapsulation of the filler particles into the elastomer takes place when maleated EPR-rubber (EPMA) is used, and the encapsulated structure prevails even under the severe shearing conditions of injection molding. The improved matrix/filler adhesion resulted in increased yield stress and tensile strength, but decreased impact resistance. The particle size of the filler proved to be a crucial factor; below a certain particle size aggregation becomes a dominating factor. Extensive aggregation leads to the deterioration of all mechanical properties, especially to decreased impact strength.

Original languageEnglish
Pages (from-to)5911-5918
Number of pages8
JournalJournal of Materials Science
Volume34
Issue number23
DOIs
Publication statusPublished - Dec 1 1999

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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