Effect of arrangement of nano and micro barium titanate (BaTiO₃) particles on the enhanced dielectric constant of high‐density polyethylene (HDPE)/BaTiO₃

Abstract

The aim of this study is to improve the dielectric and mechanical properties of HDPE/BaTiO3 composites by binary BaTiO3 particles, when the volume fraction of BaTiO3 is constant. In this study, it was found that the pack density of binary BaTiO3 particles in HDPE/BaTiO3 composite relies on particle ratio and volume fraction of small particles. It is found that the addition of 50 vol % 1600 nm BaTiO3 particles can boost the dielectric constant of HDPE control from 2 to 30 (14 times higher) at 40 Hz and 19 (8.5 times higher) at 40 MHz, respectively. When the particle ratio was 4, the substitution of 10 vol % 1600 nm BaTiO3 particles by 10 vol % 400 nm BaTiO3 particles can further enhance the dielectric constant of HDPE/L‐BT (10/10) from 30 to 50 (67% increase) at 40 Hz and from 19 to 42 (121% increase) at 40 MHz, respectively, without greatly influencing the volume resistivity of HDPE composites. In addition, the thermal conductivity of HDPE with binary BaTiO3 particles were all above 2.0 W/(m•K). © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 1101–1108

Dielectric performance of composites of BaTiO3 and polymers for capacitor applications under microwave frequency

“…The increase in frequency resulted in a reduction of dielectric permittivities independent of BaTiO 3 concentration and particle size. However, the loss tangent values for the composites did not show a frequency dependent behavior and in some cases that parameter decreased as the frequency increased 47 …”

“…Similar observations were made in the studies listed in Table 4. It seems that the composites generally exhibited higher permittivity values in the low‐frequency domain 24,46,47 . The increase in frequency resulted in a reduction of dielectric permittivities independent of BaTiO 3 concentration and particle size.…”

Combined effect of modified titanium carbide (TiC) particles and ethylene alpha olefins (POE) on properties of ethylene propylene diene monomer (EPDM)/TiC/POE composites for electronic application

“…Crosslink density of EPDM composites were tested by the solvent swell method and calculated by Flory-Rehner equation (1).…”

“…In this way, the processing fluidity of EPDM/TiC (10/2) gum can be improved by the addition of POE. [1,23] ( Fig. 2)…”

“…Dielectric polymer/ceramic composites have attracted increasing attention in electronic domain worldwide. [1][2][3] Some multilayer capacitors and embedded sensors, which is made out of fluoride polymer/ceramic composites, possess high dielectric constant, due to the polar structure of fluoride polymer. However, the polar and rigid matrix can decrease the processing fluidity and increase the stiffness of fluoride polymer/ceramic composites, which restricts their application.…”