Improved Physical, thermal, and conductivity strength of ternary nanocomposite films of PVDF/PMMA/GO NPs for electrical applications

Abstract

Polymer nanocomposites samples polyvinylidene fluoride/Polymethyl methacrylate (PVDF/PMMA) mixed with various concentrations of graphene oxide nanoparticles (GO NP's) were created using solution casting and ultrasonic-assisted solution casting processes. The characteristics of the manufactured polymer samples were studied using XRD, FTIR, TEM, TGA, and DSC. The AC conductivity, dielectric constant, and dielectric loss of PVDF/PMMA-GO nanocomposites were examined as a function of GO concentrations. XRD analysis demonstrates the semicrystalline PVDF/PMMA and shows that the doped PVDF/PMMA films have a lower crystallinity degree (Xc) than the pure blend. The interaction between the GO ions and the PVDF/PMMA matrices is demonstrated by significant fluctuations in the FTIR spectra. TEM revealed that the GO nanoparticles were produced in spherical and cubic shapes, with an average size of 18.6 nm. The energy gap of nanocomposite films reduced as the GO NP's concentration in the polymer mix increased, decreasing from 4.24 eV to 3.71 eV for the indirect transition. The PVDF/PMMA exhibits a single glass transition temperature (Tg) according to the DSC study, showing that the PVDF and PMMA are miscible. The melting point of the nanocomposite films increased from 244.39 °C to 251.56 °C, increasing their thermal stability. Thermogravimetric analysis (TGA) curves showed that the PVDF/PMMA polymeric matrix had increased thermal stability. Dielectric constant and loss analyses have been performed to gain a better knowledge of charge storage properties and conductivity relaxation. The highest ionic conductivity of PVDF/PMMA blended with 0.08 wt. GO NP's is ~7.23 × 10–5 S/cm. These findings are expected to have a considerable effect on a wide range of applications, such as polymer solar cells, nanoelectronics, polymer organic semiconductors, and energy storage.