Polymers and Polymer Composites

RHEOLOGY OF HIGHLY FILLED POLYPROPYLENES PREPARED WITH SURFACE TREATED FILLERS

July 1, 2003 By: Ren Z; Shanks R A; Rook T J Research article

Title: RHEOLOGY OF HIGHLY FILLED POLYPROPYLENES PREPARED WITH SURFACE TREATED FILLERS
Page Range: p.541-550
Author(s): Ren Z; Shanks R A; Rook T J
File size: 121K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 11
Issue No: No. 7

Abstract
This study reports on the production of highly filled PP composites by the extrusion of polypropylenes with surface treated fillers. The aim of the investigation was to include the highest proportion of filler in order to provide hardness and high density, without undue brittleness. It was shown that the viscoelastic behaviour of melt flow of highly filled polypropylene composites significantly depended on certain properties of the fillers. These included aspect ratio, specific surface area and particle size. Fillers considered included talc, calcium carbonate and barium sulphate. Traditional surface modifiers such as stearic acid were found to be useful, but titanates, and in particular, small amounts of silicones were shown to provide the greatest rheological modification. 25 refs.


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