Electrical conductivity of melt-spun thermoplastic poly(hydroxy ether of bisphenol A) fibres containing multi-wall carbon nanotubes

Epoxy/multi-wall carbon nanotubes and epoxy/multi-wall carbon nanotubes/mineral fillers nanocomposites were produced via in situ polymerization assisted by three-roll-milling. Epoxy/multi-wall carbon nanotubes nanocomposites presented very low electrical percolation threshold, near to 0.05 wt %. In this study, we used different mineral fillers, with different aspect ratios: calcium carbonate, montmorillonite, and sepiolite. We evaluated the effect of the addition of these fillers on electrical, thermal, and thermo-mechanical properties of epoxy/multi-wall carbon nanotubes nanocomposites. The addition of calcium carbonate in epoxy/multi-wall carbon nanotubes nanocomposites increased the electrical conductivity of this nanocomposite, due to volume exclusion effect. The addition of sepiolite decreased the loss factor and improved electrical constant, however, reduced the electrical conductivity in these nanocomposites, when compared to epoxy/multi-wall carbon nanotubes. Regarding thermal properties, no significant change in glass transition was observed. Thermo-mechanical analysis for nanocomposites showed slight changes in tan (δ) and storage modulus, which is related to the interaction between epoxy, multi-wall carbon nanotubes and mineral fillers.

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Preparation and Electrical Conductivity of Composites of PA66 Filled with Carbon Nanotubes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.87-88.363 ◽

2009 ◽

Vol 87-88 ◽

pp. 363-368

Author(s):

Fang Chang Tsai ◽

Peng Li ◽

Xiao Peng Shang ◽

Ning Ma ◽

Lung Chang Tsai ◽

...

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Ultrasonic Vibration ◽

Multi Wall Carbon Nanotubes ◽

Mixed Acid

An investigation of the blend of PA66 / organic modified multi-wall carbon nanotubes (MWNT) is reported. The MWNT was carboxylated in a sulfuric and nitric mixed acid under ultrasonic vibration. In fact, the electrical conductivity of these composites is analyzed. The MWNT-filled PA66 shows percolation point of the electrical conductivity at low filler loadings (0.5-12wt%). Presumably, the carboxylated MWNT was reacted with PA66. The neat MWNT, carboxlyated MWNT, and PA66/MWNT composites were characterized with FTIR, polarity, DSC, and electrical conductivity.

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Comparing the performance of electrospun and cast nanocomposite film of polyamide-6 reinforced with multi-wall carbon nanotubes

Journal of Plastic Film & Sheeting ◽

10.1177/8756087918794229 ◽

2018 ◽

Vol 35 (1) ◽

pp. 45-64 ◽

Cited By ~ 2

Author(s):

N Ghane ◽

S Mazinani ◽

AA Gharehaghaji

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Carbon Nanotube ◽

Polyamide 6 ◽

Nanocomposite Films ◽

Multi Wall Carbon Nanotubes ◽

Nanofiber Diameter ◽

Polymeric Emulsifier ◽

Reported Data ◽

Multi Wall Carbon Nanotube

This study aims at fabrication and characterization of two different structures of electrically conductive polyamide 6/multi-wall carbon nanotube nanocomposite films at different multi-wall carbon nanotube concentrations including electrospun nanofibrous and cast films. Morphology, embedded multi-wall carbon nanotubes into nanofiber, thermal behavior, electrical conductivity and wettability of films were characterized. Scanning electron microscopy images depicted that the nanofiber diameter decreased with increased nanofillers. Enhancement of crystallinity, electrical and tensile properties, and simultaneously achieving a low percolation threshold confirmed good nanotube dispersion by employing a polymeric emulsifier, polyvinylpyrrolidone. The electrospun film crystalline content increased 18.5% and the cast ones increased 46.8% at 7 wt.% multi-wall carbon nanotubes loading. The electrospun and cast membrane electrical conductivity increased by 10 and 12 orders of magnitude. These results demonstrated higher values compared to previously reported data for polyamide 6/multi-wall carbon nanotube nanocomposites. The electrospun film Young’s modulus increased 93% and that of casted one increased 267%, due to the increased crystallinity after adding carbon nanotubes into the films.

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