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Fluoropolymer processing aids in linear-low density polyethylene extrusion: How to improve their efficiency?

Claire Dubrocq-Baritaud 1 Evelyne Darque-Ceretti 1 Bruno Vergnes 1
1 CEMEF - Centre de Mise en Forme des Matériaux
Abstract : Mechanisms of wall coating and wall slippage during extrusion of polyethylene with fluoropolymer based Polymer Processing Aids (PPAs) are reviewed for various types of PPAs. It is shown that the spreading of PPA coating on die surface can be improved by using a wetting agent, like a polyethylene glycol. Wall slip is favored by lowering the entanglement density in the interdiffusion phase between PPA and polyethylene. Finally, the morphology of PPA coating is investigated. It can be explained by the balance between viscosity and interfacial energy.
Keywords : Extrusion Sharkskin Wall slip Polymer processing aids
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01024342
Contributor : Magalie Prudon <>
Submitted on : Wednesday, July 16, 2014 - 9:33:01 AM
Last modification on : Thursday, September 24, 2020 - 5:22:55 PM

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CNRS | ENSMP | PARISTECH | ENSMP_CEMEF | INSTITUT-TELECOM | PSL

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Claire Dubrocq-Baritaud, Evelyne Darque-Ceretti, Bruno Vergnes. Fluoropolymer processing aids in linear-low density polyethylene extrusion: How to improve their efficiency?. Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2014, 208-209 (June-July), pp.42-52. ⟨10.1016/j.jnnfm.2014.04.002⟩. ⟨hal-01024342⟩

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