Dielectric and mechanical properties of nickel silica core-shell reinforced PMMA nanocomposites

Abstract

This paper study the dielectric and mechanical properties of poly (methyl methacrylate)-nickel silica core-shell nanocomposite. Ni@SiO2/PMMA nanocomposite films were prepared by incorporating Ni@SiO2 nanoparticles in PMMA matrix using the solution casting method. The morphology of the prepared nanoparticles was examined through a High-resolution transition electron microscope (HRTEM), which revealed the formation of SiO2 shell at Ni magnetic nanoparticles. The dielectric properties of the nanocomposite films were studied as a function of temperature and frequency in the ranges of 30–180°C and 100 Hz – 5 MHz respectively. The incorporation of the nano Ni@SiO2 to PMMA has a positive effect on the dielectric constant ε′ of the nanocomposites, as well as, ε′ improved with increasing temperature. The real electric modulus (M′) of composites confirms the occurrence of dispersion in all composites at all temperatures. While dielectric loss tangent ε ″ and the loss part of electric modulus spectra (M) exhibit relaxation peaks which characterize possible relaxation of interfacial polarization in the interface between Ni@SiO2 core-shell and PMMA matrix, these peaks have shifted towards higher frequency with temperature. The relaxation and activation energies, Ec and Ea values decreased from 0.49 to 0.40 eV and from 0.87 to 0.70 eV respectively as Ni@SiO2 content increased. The ac conductivity of the nanocomposite films has deeply increased with increasing temperature and Ni@SiO2 content. The longitudinal modulus (L), shear modulus (G), Young's modulus (E), and bulk modulus (B) of films were studied and they increased as the filler increased from 0 to 15 wt.%.

Advantages incorporating V2O5 nanoparticles into PMMA composite membranes for the structural, optical, electrical, and mechanical properties for conductive polymeric membrane applications

“…This decrease might be ascribed to the structural softening that perhaps accompanied the addition of V 2 O 5 . 20…”

“…Many polymer composites have been established through combining several nanofillers, such as carbon-based materials, nickel and silica. The dielectric and mechanical properties of PMMA nanocomposites reinforced with nickel silica, [18][19][20][21][22] as well as with silica, titania, etc., [23][24][25] have been studied. The addition of nanofillers to polymers has been studied to develop polymer materials with excellent properties for expanded industrial applications.…”

“…Many polymer composites have been established through combining several nanofillers, such as carbon-based materials, nickel and silica. The dielectric and mechanical properties of PMMA nanocomposites reinforced with nickel silica, 18–22 as well as with silica, titania, etc. , 23–25 have been studied.…”

Novel cobalt lead ferrite (CPFO)/Ps nanocomposites with enhanced structure, optical and dielectric properties

“…Additionally, the accumulation of charge carriers on the polystyrene matrix's inner surface is detected by Maxwell-Wagner-Sillars effects [52,53]. Furthermore, in heterogeneous systems, such as composites made of more than one phase, such as polymers with filler, the charge carriers move between the different phases and it builds up at the interface between the polymer matrix and the nanofiller, resulting in a sort of polarization as seen in FESEM graphs [4].…”

“…The advantages of polymeric materials to use them in optoelectronic devices arise from their increased stability and ability to create large-area devices with enhanced flexibility substrates. The incorporating of fillers in the polymer matrix enhances the physical properties of such materials [3,4]. Polymers, such as polyvinyl alcohol (PVA) [5][6][7][8][9], polymethyl methacrylate (PMMA) [10][11][12][13][14], Polyvinylchloride (PVC) [15][16][17], polyvinyl pyrrolidone (PVP) [18], blend of polyvinyl alcohol (PVA) /polyvinyl pyrrolidone (PVP) [19,20], polyvinylidene fluoride (PVDF)/ polyvinyl chloride (PVC) [21,22] and others, are currently favoured by many researchers as appropriate matrices for enhancing polymer nanocomposite materials due to their extended lifespan, increased suppleness, reduced weightiness, simplicity of preparation, ecological persistence, good mechanical properties, and so on.…”