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. Molnar, B. Pukanszky

Research output: Chapter in Book/Report/Conference proceedingChapter

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
Title of host publicationDoktorsavhandlingar vid Chalmers Tekniska Hogskola
PublisherChalmers Tekniska Hogskola
Pages18
Number of pages1
Edition1338
Publication statusPublished - Dec 1 1997

ASJC Scopus subject areas

  • Engineering(all)

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    Hammer, C. O., Maurer, F. H. J., Molnar, S., & Pukanszky, B. (1997). Control of the structure and properties of barium sulphate-filled blends of polypropylene and ethylene propylene copolymers. In Doktorsavhandlingar vid Chalmers Tekniska Hogskola (1338 ed., pp. 18). Chalmers Tekniska Hogskola.