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Influence of injection molding on the electrical properties of polyamide 12 filled with multi-walled carbon nanotubes

Article dans une revue avec comité de lecture
Author
VERSAVAUD, Sophie
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
REGNIER, Gilles
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
GOUADEC, Gwénaël
247183 De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies [MONARIS]
VINCENT, Michel
1158 Centre de Mise en Forme des Matériaux [CEMEF]

URI
http://hdl.handle.net/10985/9122
DOI
10.1016/j.polymer.2014.10.038
Date
2014
Journal
Polymer

Abstract

Microinjection-molded and compression-molded polyamide (PA12) matrix composites filled with 0.67, 1.33, 2 and 4 wt% multi-walled carbon nanotubes (MWNTs) were prepared from twin-screw extruded pellets. The compression molded samples have an electrical percolation threshold close to 1.2 wt%. Coupled rheological and electrical measurements show that their electrical properties start decreasing as soon as shear begins and are partially restored during flow, suggesting successively breakage and reconstruction of a percolating network. On the other hand, the electrical properties of the microinjection molded composites are close to the matrix ones, showing that cooling is too fast for the MWNTs to form a network. There is some electrical anisotropy in these composites, as evidenced by a greater conductivity measured in the flow direction. However polarized Raman spectroscopy analysis does not reveal a significant orientation of the MWNTs.

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