Polystyrene/calcium phosphate nanocomposites: Morphology, mechanical, and dielectric properties

Abstract

Matrix mediated synthesis of nanoparticles was utilized to prepare calcium phosphate nanoparticles with a size of 10 nm. The particles were characterized by X‐ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. Nanocomposites of polystyrene and nano‐calcium phosphate were prepared by the melt‐mixing technique. The composites were characterized by TEM to assess the dispersion of the nanoparticles. SAXS measurements of the composites and the fit with Beaucage model described the fractal dimensions of the particles. Mechanical properties of the composites significantly improved with the addition of nanofillers. Dielectric behavior of the nanocomposites was measured with respect to the filler content, temperature, and frequency. The dielectric constant increases with increase in temperature and decreases with increase in frequencies. Dielectric constant increased with filler content in all frequencies; however, lower frequencies showed marked effect. α‐Relaxation of the composites from the dissipation factor of the composites showed higher values for the lower frequencies. Electrical conductivity increased with respect to the filler content and volume resistivity showed the reverse trend. The theoretical prediction of the dielectric constant showed close agreement with the experimental value. POLYM. ENG. SCI. 2012. © 2011 Society of Plastics Engineers

Low dielectric loss and weak frequency dependence of dielectric permittivity of the CeO2/polystyrene nanocomposite films

“…13 Dielectric response of PS composites has been reported by some groups. [14][15][16][17] But to the best of our knowledge, the CeO 2 / PS composite has never been reported for the dielectric properties.…”

Fabrication and characterization of novel ethyl cellulose-grafted-poly (ɛ-caprolactone)/alginate nanofibrous/macroporous scaffolds incorporated with nano-hydroxyapatite for bone tissue engineering

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Collagen‐alginate‐nano‐silica microspheres improved the osteogenic potential of human osteoblast‐like MG‐63 cells

“…In spite of inherent fragility, however, this part has an excellent strength. 8,9 Commensurate with this statement, an ideal scaffold for bone regeneration must include two or more substrates in combination with natural molecules to induce an efficient cell adhesion, proliferation, and differentiation rate. 10,11 As a matter of fact, researchers agree to use more than two polymers for scaffolds fabrication with characteristics similar to the natural ECM while maintaining 3D structure.…”

“…Natural bone extracellular matrix (ECM) possesses diverse inorganic substrates such as glycosaminoglycans, osteocalcin, sialoprotein, and osteopontin. In spite of inherent fragility, however, this part has an excellent strength . Commensurate with this statement, an ideal scaffold for bone regeneration must include two or more substrates in combination with natural molecules to induce an efficient cell adhesion, proliferation, and differentiation rate .…”