Enhancement of dielectric constants of epoxy thermosets via a fine dispersion of barium titanate nanoparticles

Abstract

In this study, we examined a facile approach for achieving a fine dispersion of barium titanate (BT) nanoparticles (NPs) in epoxy thermosets. First, the surfaces of BT NPs were modified with poly(e-caprolactone) (PCL) via a surface-initiated ring-opening polymerization approach. We found that the PCL-grafted BT NPs were easily dispersed in epoxy thermosets. The fine dispersion of the PCL-grafted BT NPs in the epoxy thermosets was evidenced by transmission electron microscopy and dynamic mechanical thermal analysis. We found that the organic-inorganic nanocomposites displayed significantly enhanced dielectric constants and low dielectric loss compared to the control epoxy. The nanocomposites containing 14.1 wt % BT NPs possessed dielectric constants as high as at a frequency of 10 3 Hz. The dielectric loss was measured to be 0.002 at a frequency of 10 3 Hz. The improved dielectric properties are accounted for the fine dispersion of the BT NPs in the epoxy thermosets. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2016, 133, 43322.

Electrical Properties of Polyetherimide-Based Nanocomposites Filled with Reduced Graphene Oxide and Graphene Oxide-Barium Titanate-Based Hybrid Nanoparticles

“…The characteristic diffraction peaks at 24.48° and 42.71° correspond to the (002) and (101) characteristic diffraction planes of the graphitic structure of rGO [ 28 ], which are randomly rearranged after the graphene oxide (GO) reduction process to rGO. For the GO-g-PMMI/BTN, the characteristic diffraction peaks of BTN appeared at 2θ = 22.05°, 31.42°, 38.86°, 45.18°, 50.80°, 56.15°, 65.64°, and 74.89°, which are associated with the typical structure of a perovskite, such as barium titanate, of (100), (110), (111), (200), (201), (211), (220) and (310) diffraction planes, respectively [ 29 , 30 ].…”

Low Magnetic Field Induced Extrinsic Strains in Multifunctional Particulate Composites: An Interrupted Mechanical Strengthening in 3D-Printed Nanocomposites

“…Although, specific to filament productions, extrusion techniques using numerous methods of morphologies (e.g., platelets or else) are available. It is evident that the properties exhibited in a produced filament are significantly affected by the presence of porosity and by the filler distribution [39]. Other approaches to achieve a better dispersion are physical mixing, e.g., ultrasonication, and surface functionalisation of functional fillers such as iron or ceramic.…”