Enhanced breakdown strength and restrained dielectric loss of polypropylene/maleic anhydride grafted polypropylene/core‐shell ZrO₂@SiO₂ nanocomposites

Abstract

To simoutinusly achieve improved breakdown strength (BDS) and suppressed dielectric loss, a modified ternary nanocomposite composed of polypropylene (PP), maleic anhydride‐grafted PP and core‐shell structure SiO2@ZrO2 nanoparticles is proposed. By tailoring the thickness of SiO2 shell from 3 to 11 nm and the nanofillers content from 0.5 to 5 wt%, the particles disparsion is improved and meanwhile both the deep trap density and the interaction force between molecules are enhanced. In consequence, the restricted transportation of electrons along molecule chains as well as between chains together raise the DC BDS, that the BDS of optimum sample film reaches 430.8 kV/mm, 23% higher than neat PP. Besides, the ternary nanocomposites with SiO2@ZrO2 less than 3 wt% maintain the tanδ below 0.3% at a broad frequency ranging from 0.1 Hz to 100 kHz, which is an extremely low level same as neat PP.

Nanoscale Composite Protective Preparation for Cars Paint and Varnish Coatings

“…The obtained diffuse light reflection spectra are shown in Figure 13. We have established that in the samples of a nanoscale composite protective coating, almost complete reflection (R > 73%) is observed both in the region of near-and medium UV-radiation from 250 to 400 nm, and in the visible spectrum region from 400 to 450 nm, which is due to the dielectric nature of prepared material [44].…”

Nanobrick Wall Multilayer Thin Films with High Dielectric Breakdown Strength

“…It is important to note that the terms loss %, dielectric loss, loss tangent, and tanδ are interchangeable with one another. − When analyzing dielectric loss in the frequency regime of 100 Hz to 1 MHz, the PEI/PAA system demonstrates extraordinarily high losses compared to the other systems. These high losses and high dielectric constant (particularly in the realm of 100–1000 Hz) are to be expected of a polyelectrolyte multilayer system and can be attributed to ionic polarization as well as ion transport due to residual amounts of small ions in the film .…”

A facile synthesis of PEGylated Cu2O@SiO2/MnO2 nanocomposite as efficient photo−Fenton−like catalysts for methylene blue treatment

“…Furthermore, the peak centered at 1648 cm −1 was assigned to bending and stretching vibrations of the surface OH groups stemming from PEG modifications on the Cu 2 O@SiO 2 /MnO 2 surface ( Caccamo and Magazù, 2017 ; Singh et al, 2020 ; Ghauri et al, 2022 ). Additionally, the broad absorption peaks at approximately 1063 cm −1 and 797 cm −1 corresponded to the asymmetric stretching mode of Si−O−Si and Si−O−C bonds and symmetric stretching vibration of Si−O bonds, respectively ( Cheng et al, 2022 ). The band at 630 cm −1 was coincident with the optically active lattice vibration of Cu−O in Cu 2 O ( Zhang et al, 2009 ; Hao et al, 2021 ).…”