Effect of TiO₂ modified with dopamine and Silane coupling agent on the electrical properties of PMIA insulation paper

Abstract

Poly-m-phenyleneisophthalamide (PMIA) with excellent chemical stability and breakdown strenth is regarded as the next generation of insulating paper in power system. However, the basic intensity of PMIA is not enough to match its operating cost, and it is promising to enhance the performance by nano composition. In this paper, the influence of nano-TiO 2 ith a mass fraction of 1 to 5 wt% on insulating properties is studied, including breakdown voltage and bulk conductivity. The silane coupling agent aminopropyltriethoxysilane (APTES) together with the polydopamine (PDA) are used for modifying the fillers interface. The results show that, APTES covalent grafting and PDA physically coating can improve the dispersion and compatibility of nano-TiO 2 in aramid fiber matrix, thus regulating the interface trap characteristics and reducing the probability of electric field distortion in insulating paper. When the modified TiO 2 content is 2 wt%, the breakdown voltage is the highest, which is 23.9 kV/mm, 54% higher than that of pure aramid paper. In addition, this article discusses the modification mechanism from molecular dynamic simulation and trap characteristics. Based on molecular dynamics calculation, three interface models of PMIA-TiO 2 , PMIA-TiO 2 /APTES, PMIA-TiO 2 / APTES/PDA are constructed, and the synergistic effect of PDA is confirmed from the microscopic level.

Incorporated TiO2 nanoparticles into PVC/PMMA polymer blend for enhancing the optical and electrical/dielectric properties: Hybrid nanocomposite films for flexible optoelectronic devices

“…They have attracted extensive interest as a result of their superior biocompatibility, optical qualities, corrosion resistance, and catalytic and electrical characteristics. 2,3 TiO 2 NPs are widely used as photocatalysts and antimicrobial agents, 4 supercapacitors, 5 and energy storage devices. 6,7 TiO 2 NPs are highly influenced by non-structural properties, including density distribution, shape, crystal size, and aspect ratio.…”

“…The most common nanomaterials employed in this sector are metal‐oxide nanomaterials, such as titanium dioxide nanoparticles (TiO 2 NPs). They have attracted extensive interest as a result of their superior biocompatibility, optical qualities, corrosion resistance, and catalytic and electrical characteristics 2,3 . TiO 2 NPs are widely used as photocatalysts and antimicrobial agents, 4 supercapacitors, 5 and energy storage devices 6,7 .…”