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New approaches to the processing of rutile‐filled polyolefins
Author(s) -
Duchesne D.,
Schreiber H. P.,
Johnson B. V.,
Blong T. J.
Publication year - 1990
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760301604
Subject(s) - materials science , elastomer , rheology , rutile , composite material , inverse gas chromatography , linear low density polyethylene , extrusion , economies of agglomeration , polyethylene , polymer , chemical engineering , engineering
The performance of a fluorocarbon elastomer processing additive in rutile‐filled linear low density polyethylene (LLDPE) compounds was evaluated by capillary rheometry, and blown film extrusion. Different compounding sequences were considered and their effects on the performance of the processing additive in the presence of various rutiles examined. Lower apparent melt viscosities and higher shear rates for the onset of melt fracture were observed when using certain surface treated rutiles. The nature of the surface coating applied to rutiles was found to have a great influence on the Theological properties of the filled compounds and on the dispersibility of the solids. The acid‐base characteristics of rutiles were determined by inverse gas chromatography techniques, and inherent agglomeration indexes for the pigments were measured by an application of powder rheology principles. It was found that those rutiles with high agglomeration indexes or those with highly basic surfaces interfered the most with the processing additive. Mechanisms by which rutile dispersibility and acid‐base character influence the effectiveness of the fluorocarbon elastomer processing additive are discussed.