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

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...

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Bibliographic Details
Published in:Polymer engineering and science 2022-09, Vol.62 (9), p.2998-3009
Main Authors: Fang‐cheng, Lü, Mei‐ying, Zhu, Jing‐xuan, Song, Xiu‐quan, Lu, Hao‐ou, Ruan, Qing, Xie, Sheng‐hui, Wang, Sheng‐dong, Yin, Xiao‐bin, Chang
Format: Article
Language:English
Subjects:
Aminopropyltriethoxysilane
APTES
Breakdown
Coupling (molecular)
Coupling agents
Dopamine
Electric fields
Electric potential
Electrical distortion
Electrical properties
Insulation
materials studio
Molecular dynamics
PMIA
Silanes
Synergistic effect
TiO2
Titanium dioxide
Voltage
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Summary: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‐TiO2ith 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‐TiO2 in aramid fiber matrix, thus regulating the interface trap characteristics and reducing the probability of electric field distortion in insulating paper. When the modified TiO2 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‐TiO2, PMIA‐TiO2/APTES, PMIA‐TiO2/APTES/PDA are constructed, and the synergistic effect of PDA is confirmed from the microscopic level. For meta‐aramid paper, the micro‐modified doping effect of pure TiO2 is limited. The insulation properties of the composite were improved after the co‐modification of polydopamine and APTES, and reached the optimal value when the mass fraction is 2 wt% at low concentration.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.26080