Selective migration in polyethylene/rubbery particles blends during capillary flow

Autor:	Lazhar Benyahia, Jean-François Bardeau, H. Dang Ngoc, Jean-François Tassin, C. Chartier
Rok vydání:	2009
Předmět:	Materials science Polymers and Plastics Capillary action General Chemistry Polyethylene Suspension (chemistry) Shear rate Viscosity chemistry.chemical_compound chemistry Materials Chemistry Particle Extrusion Composite material Dispersion (chemistry)
Zdroj:	Polymer Engineering & Science. 50:773-779
ISSN:	0032-3888
DOI:	10.1002/pen.21584
Popis:	Adding elastomeric particles (Sunigum®) into a polyethylene (PE) matrix leads to an increase of both viscosity and dynamic moduli in the molten state. This suspension effect is more pronounced if the particle's dispersion is improved with a compatibilizing agent. However, under capillary flow, the blends exhibit a more complex behavior with a strong violation of a viscosity mixing rule. To elucidate the origin of this observation, an analysis of extrudates by confocal micro Raman spectrometry has been carried out. A selective migration of the lowest viscosity component (at a given shear rate) toward the wall of the capillary die has been noted. This migration is inhibited by the addition of a compatibilizer. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers
Databáze:	OpenAIRE
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