Aggregation of particulate fillers

Factors, determination, properties

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The aggregation tendency of 11 different CaCO3 fillers with widely differing particle sizes was studied in polypropylene (PP) composites. The fillers were characterized by different techniques in powder form and in suspension. Homogenization and sample preparation were carried out by extrusion and injection molding, or in an internal mixer and compression molding, respectively. Thin slices were prepared from the composites and the relative area of aggregates was determined by image analysis. Tensile and fracture properties were studied as a function of filler content. The results proved that the extent of aggregation increases with decreasing particle size and increasing filler content. Surprisingly, extruded and injection molded samples contained more aggregates than those prepared by homogenization in an internal mixer followed by compression molding. Good agreement was found between the powder properties of the fillers and their performance in the composites. Deviations from the general tendency indicate that some factors, which were not accounted for in the study, also influence aggregation and composite properties.

Original languageEnglish
Pages (from-to)111-124
Number of pages14
JournalMacromolecular Symposia
Volume194
DOIs
Publication statusPublished - Apr 2003

Fingerprint

fillers
particulates
Fillers
Agglomeration
composite materials
Compression molding
Composite materials
homogenizing
Powders
tendencies
Particle size
Extrusion molding
injection molding
Polypropylenes
tensile properties
image analysis
polypropylene
Injection molding
Image analysis
Suspensions

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

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AU - Fekete, E.

AU - László, K.

AU - Pukánszky, B.

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