Surface modification of BaTiO₃ inclusions in polydicyclopentadiene nanocomposites for energy storage

Abstract

A new nanocomposite system displaying high breakdown strength, improved permittivity, low dielectric loss, and high thermal stability is presented. Free-standing nanocomposite films were prepared via a solvent-free in-situ polymerization technique whereby 5 vol % BaTiO 3 (BT) nanocrystals with tailored surface chemistry were dispersed in dicyclopentadiene (DCPD) prior to initiation of ring opening metathesis polymerization by a second generation Grubbs catalyst. The relative permittivity was enhanced from 1.7 in the neat poly(DCPD) film to a maximum of 2.4 in the composite, while the dielectric loss tangent was minimized below 0.7%. Surface modification of the BT nanocrystals mitigated reduction in breakdown strength of the resulting nanocomposites such that only a 13% reduction in breakdown strength was observed relative to the neat polymer films. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40290.

Electrical insulation characteristics of alumina, titania, and organoclay nanoparticles filled PP/EPDM nanocomposites

“…The dielectric breakdown data are known to be in good agreement with the Weibull distribution, which can be expressed by eq. where Et s is the scale parameter or the characteristic parameter, Et is the random variable (the measuring values of the cumulative breakdown strength), and F ( Et ) indicates the cumulative failure probability for the Weibull distribution.…”

Nanocomposites of TiO2/cyanoethylated cellulose with ultra high dielectric constants

“…Organic/Inorganic nanocomposites have received much attention in the formulation of novel high permittivity dielectrics as they exhibit unique properties compared to conventional composite materials [4][5][6][7][8][9][10]. TiO 2 is a versatile material used in a range of applications including nanodielectrics where composites of nanoscale TiO 2 with different polymers form the dielectric.…”

Construction of porous poly (aryl sulfide sulfone) film with low dielectric constant and excellent mechanical property

“…E 0 is called the characteristic breakdown strength and the breakdown strength of different samples is usually compared according to the value of E 0. 49 β represents the distribution of the breakdown strength, which is equal to the slope of the Weibull diagram of failure probability and breakdown strength 54 . Generally, the larger of β, the narrower the distribution of the breakdown strength and the better the reliability of the material.…”