Poly(propylene)/Carbon Nanofiber Nanocomposites: Ex Situ Solvent‐Assisted Preparation and Analysis of Electrical and Electronic Properties

Abstract

CNF‐reinforced PP nanocomposites were fabricated from CNFs dispersed in a boiling PP/xylene solution. Their thermal properties were characterized by TGA and DSC and shown to exhibit improved thermal stability and higher crystallinity. They were further processed into thin films by compression molding. The electrical conductivity and dielectric property of the PP/CNF nanocomposite thin films were studied. Both electric conductivity and real permittivity increased with increasing fiber loading. Electrical conductivity percolation is observed between 3.0 and 5.0 wt.‐% fiber loading. The rheological behavior of the nanocomposite melts were also investigated. It was found that a small fiber concentration affects the modulus and viscosity of PP melt significantly. magnified image

Strengthened epoxy resin with hyperbranched polyamine-ester anchored graphene oxide via novel phase transfer approach

“…The loss factor (tan θ) is usually used to evaluate the damping property of materials [53][54][55][56]. The temperature at which the loss factor curve reaches a maximum is often recorded as the T g .…”

Poly(propylene)/Graphene Nanoplatelet Nanocomposites: Melt Rheological Behavior and Thermal, Electrical, and Electronic Properties

“…With the incorporation of CNFs to the polymeric matrix, an improved thermal stability and flame retardancy have been reported, which could serve as an alternative to the conventional flame retardants. [16,17,39] The formed carbon nanofiller network structure increases the heat transfer to the surrounding and thus retard the flame. [41,42] Meanwhile, a sharp increased electric conductivity (s) is observed in the PNCs and this corresponding filler loading is normally defined as percolation threshold (P c ) with a continuous conductive network formed in the insulating polymer matrix.…”

“…[41,42] Meanwhile, a sharp increased electric conductivity (s) is observed in the PNCs and this corresponding filler loading is normally defined as percolation threshold (P c ) with a continuous conductive network formed in the insulating polymer matrix. [16,17,39] The melt rheological property provides a convenient way to evaluate the dispersion state of the nanofillers in the polymer matrix. [16,43,44] It is feasible to monitor the microstructural evolution by using some rheological parameters such as storage modulus and viscosity as indicators.…”

Magnetic epoxy nanocomposites with superparamagnetic MnFe2O4 nanoparticles

“…9(A), is observed to be almost constant around 4.25, indicating a stable dielectric performance of the cured epoxy upon frequency variation. 80 The ε ′ increases with increasing the nanoparticles loading. The interfacial polarization of the fillers would cause the enhancement of real permittivity, 81 which was caused by the charge carriers blocked at the internal surface or interfaces between matrix and fillers.…”