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Single screw extrusion compounding of particulate filled thermoplastics: State of dispersion and its influence on impact properties
Author(s) -
Wang Yeh,
Huang JiangShen
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960613)60:11<1779::aid-app1>3.0.co;2-i
Subject(s) - materials science , composite material , izod impact strength test , calcium carbonate , compounding , polypropylene , dispersion (optics) , mixing (physics) , extrusion , filler (materials) , plastics extrusion , toughness , ultimate tensile strength , physics , quantum mechanics , optics
Abstract The compounding of calcium carbonate filled polypropylene (PP) is discussed with reference to a single‐screw extruder and variants of mixing sections. The mixing section on the screw is exchangeable, and two dispersive mixing elements, namely the Zorro and the Maddock elements, were used. The calcium carbonate was surface treated with a liquid titanate coupling agent (LICA12). The impact strength was measured by a notched Izod impact tester with specimens having a U‐shaped sharp notch. The fracture toughness for the PP homopolymer and the filled composites was determined using fracture mechanics principles. The results were correlated with the state of dispersion of the calcium carbonate filler. The effects of filler concentration and surface treatment were examined as well. Correlation between state of dispersion and impact properties for calcium carbonate filled PP was obtained. We also investigated the effect of various mixing elements on the state of dispersion. The experimental results indicate that good dispersion would improve the impact properties of the polymer matrix, but only at moderate filler loading. © 1996 John Wiley & Sons, Inc.