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, SophieGOUADEC, GwénaëlVINCENT, Michel 
REGNIER, GillesAbstract
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.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lecture; ; ; ; ; ;REGNIER, Gilles; RICHAUD, Emmanuel (Elsevier BV, 2022-01-31)
Embrittlement caused by injection molding was investigated on a commercial grade of Polybutylene terephthalate (PBT). The effect of temperature and residence time in the barrel on mechanical properties was studied. Results ...
-
Article dans une revue avec comité de lecture; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;RICHAUD, Emmanuel (Elsevier, 2021)
The need for personal protective equipment increased exponentially in response to the Covid-19 pandemic. To cope with the mask shortage during springtime 2020, a French consortium was created to find ways to reuse medical ...
-
Article dans une revue avec comité de lecture(Taylor & Francis, 2011)This paper proposes a state-of-the-art laser adhesion test. It consists of testing material interfaces with laser-driven shock wave. Since the first demonstration in the 1980s by Vossen, many studies and developments have ...
-
Article dans une revue avec comité de lecture; ; ; ; ; ; ; ; ; ;REGNIER, Gilles (Wiley, 2014)
Correlating complementary multiple scale images of the same object is a straightforward means to decipher biological processes. Light microscopy and electron microscopy are the most commonly used imaging techniques, yet ...
-
Article dans une revue avec comité de lecture; ; ; ; ;REGNIER, Gilles (Elsevier, 2011)
A torsion device was designed and built for testing the shape fixity and shape recovery of shape memory polymers at large deformation. A simple thermal chamber was used to regulate the thermal environment during testing ...