Effects of TiO2 nanoparticle size and concentration on dielectric properties of polypropylene nanocomposites

A new approach to evaluate the elastic modulus of metallic foils

“…One set was produced by laser cutting using an industrial UV/C0 2 laser drilling machine. The second set of samples were cut with a steel carbide blade using the Cricut Explore Air 2 which is a state if the art method to produce samples for various experiments from foil/sheet materials (metals and polymers) [37][38][39][40]. The laser-cut samples (Fig.…”

Dielectric and Mechanical Properties of 3D Printed Nanocomposites with Varied Particle Diameter

“…Our study over the nanoparticle diameter range of 30 to 300 nm demonstrated independence of relative permittivity on particle size, but revealed a local minimum in loss tangent at a diameter of 165 nm. Sample testing was conducted in the high frequency K a band (26.5–40 GHz) where the ionic contribution to the overall relative permittivity is reduced causing filler volume rather than filler size to be the dominate factor in a material’s relative permittivity. , Deviations were observed in shear-thinning slope, glass transition temperature, and elastic modulus values as particle size varied. This work delineates how nanoparticle size within the composite affects dielectric performance, printability, and postprint mechanical characteristics and gives insight on how to strategically formulate future inks.…”

“…Womble and co-workers produced TiO 2 loaded polypropylene composites using nanoparticles with diameters of 30 to 300 nm and characterized the composites at GHz frequencies. 16 Their traditional fabrication approach investigated nanoparticle volume fractions up to 0.3 and noted diameter dependent dielectric responses. These results taken together with the push toward using 3D printed devices at higher frequencies necessitates further investigation into the dielectric performance of highly filled 3D printed nanocomposites.…”

Tuning Polymer/TiO2 Nanocomposites Morphology by In Situ Non-Hydrolytic Sol-Gel Syntheses in Viscous Polymer Medium: Influence of the Polymer Nature and Oxygen Donor

“…Besides their use as pure matrices, they are often combined with inorganic fillers to reach specific properties such as barrier, mechanical, conductive properties, etc. These properties are highly dependent on the nanofillers dispersion [ 1 , 2 , 3 ]. However, dispersing hydrophilic fillers such as oxides in hydrophobic matrices remains challenging.…”

“…The addition of a compatibilizer to promote the dispersion of TiO 2 nanofillers is also a common strategy. For example, the polypropylene grafted by maleic anhydride (PP-g-MA) was employed by Womble et al [ 3 ] to improve the dispersion of TiO 2 nanofillers in a polypropylene (PP) matrix. PP/TiO 2 nanocomposites with 15vol% of fillers (with a diameter size of around 30 nm) were prepared with or without adding PP-g-MA through a suspension in hot toluene.…”