Particle Size Effect on the Corona Resistant Properties of PI/TiO2 Composite Films

Guang You Li; Jing Hua Yin; Lei Yao; Xing Zhao

doi:10.4028/www.scientific.net/AMR.981.914

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Particle Size Effect on the Corona Resistant Properties of PI/TiO₂ Composite Films

Abstract:

Polyimide-based (PI) nanocomposites possess excellent electrical and thermal performance, widely used in inverter motor. In the paper using different particle sizes made polyimide/titania (PI/TiO2) nanocomposite films in situ polymerization, including 20nm A series and 50nm B series. The results shows that A series have a larger specific surface, combination of the film and matrix is closer without affecting the imidization of PI, and there is a clear interface layer and the structure is more stable. According to the time of corona-resistant A Series films is significantly longer than B Series films, especially the A series films with 15% of which corona-resistant time is 15h, five times than the pure PI. By both SAXS and XRD particle size in the matrix can be calculated, proving small particles can be better combination of the matrix of PI, increasing the number of traps, more effectively cutting off charge corrosion and making corona resistance greater performance.