Properties of polyethylcyanoacrylate/modified Mt composites with highly exfoliated montmorillonite

Fekry, Mohamed; Mazrouaa, Azza M.; Mohamed, Manal G.; Abulyazied, Dalia E.

doi:10.1007/s00289-020-03402-1

Cited by 4 publications

(1 citation statement)

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“…Therefore, there is more concern placed on choosing appropriate polymer matrices and fillers. [4][5][6][7][8][9][10][11][12][13] PMMA is one of the most widely used transparent polymers known for its applications in various markets from car windows, smartphone screens to aquariums. It is a tough plastic, easy to shape, and a great alternative to the high cost and less resilient glass.…”

Section: Introductionmentioning

confidence: 99%

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

Abulyazied

Abomostafa

2021

Journal of Composite Materials

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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.%.

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