Thermal and electrical properties of graphene incorporated into polyvinylidene fluoride/polymethyl methacrylate nanocomposites

Abstract

Polymer blend based on polyvinylidene fluoride (PVDF)/polymethyl methacrylate (PMMA) and the blend incorporated with low content ( £ 0.08) of graphene (GN) oxide were prepared. The characteristic bands for PVDF and PMMA were detected in Raman and IR spectroscopy. There are shifts in Raman and IR spectra due to interaction between the polymer and the blend with OH and C5O in GN oxide. The TGA thermograms show main weight loss in temperature range from 3218C to 4818C attributed to thermal decompositions of polymeric chain. The thermal decomposition was shifted toward higher temperature than that the blend confirms enhancement of thermal stability of the films. The AC electrical conductivity and kinetic parameters were measured at different temperature frequencies. The addition of GN increases the conductivity. The values of e 00 are high at low frequencies and it is decrease with increase frequencies due to polarization effects or to the dipoles not begin to follow the field variation at higher frequencies. The increase in tan d with increase in GN oxide content due to interfacial polarization mechanism occurred in the films corresponding to frequencies. All results data indicate that the nanocomposites contain GN were enhanced.

Effect of MWCNTs Functionalization on Thermal, Electrical, and Ammonia-Sensing Properties of MWCNTs/PMMA and PHB/MWCNTs/PMMA Thin Films Nanocomposites

“…The capacitance values of 2 wt% and 5 wt% g-MWCNTs/PMMA and 5 wt% f-MWCNTs/PMMA nanocomposites showed a decreasing trend with increasing frequency. The decrease in capacitance is because dipoles’ relaxation is unable to reach equilibrium with electric field variation at different frequencies [ 60 ]. However, the increase in the capacitance with frequency may be due to the development of microcapacitors in the polymer matrix of dielectric materials when neighboring nanotubes are disconnected by a thin polymer [ 61 ].…”

Graphene–polyamide‐6 composite for additive manufacture of multifunctional electromagnetic interference shielding components

“…Frequency dependence in ε ′′ was observed in the GC (CM) although it had remained relatively constant in neat PA6 specimens. The decreasing trend of ε ′′ with increasing frequency can be attributed to the dipoles being unable to remain in phase and reduction in charge accumulation due to hindered ion diffusion with the increasing rate of electrical field variation 42,43 . As frequency dependence of ε ′′ is only observed when filler content is sufficiently high, 44 the reduced frequency sensitivity in ε” of GC (ME) can be attributed to reduced influence of interfacial polarization following printing due to the presence of inter‐layer voids.…”

Flexible dielectric polymer nanocomposites with improved thermal energy management for energy-power applications

“…However, all the nanocomposites exhibited greater frequency dependence than the pure PVDF. This is because of the PVDF matrix and the nanoparticles having different polarization effects and dipole relaxation while achieving equilibrium at high frequency (Alhusaiki-Alghamdi, 2017).…”