Preparation and Corona Resistant of Polyimide/TiO2 Nanocomposite Films

doi:10.3724/SP.J.1077.2014.12749

Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (1): 98-102.DOI: 10.3724/SP.J.1077.2014.12749

• Research Paper • Previous Articles Next Articles

Preparation and Corona Resistant of Polyimide/TiO₂ Nanocomposite Films

KONG Yu-Nan¹, YIN Jing-Hua^{1, 2}, TIE Wen-Lu¹, LIU Xiao-Xu¹, SONG Ming-Xin¹, LEI Qing-Quan²

(1. School of Applied Science, Harbin University of Science and Technology, Harbin 150080, China; 2. Key Laboratory of Engineering Dielectric and its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China)

Received:2012-12-11 Revised:2013-03-05 Published:2014-01-20 Online:2013-12-09
About author:KONG Yu-Nan. E-mail: kyn10000@163.com
Supported by:
National Natural Science Foundation of China (51077028); National Natural Science Foundation of Heilongjiang Province of China (A201006); NSF of Heilongjiang Province of China (QC2011C106)

Abstract

Abstract: The polyimide (PI)/TiO₂ composite films with different component were prepared by in-situ dispersion polymerization. Thickness of the obtained films is about 50 μm. The characterization results show that diameter of spherical TiO₂ in the films is about 100 nm and the size of the lamellar polyimide is about 2 μm ×1 μm. With the increase of the TiO₂ content, electrical breakdown strength increases firstly and then decreases, while the values of permittivity, dielectric loss, corona resistant lifetime increase. Under the electric field of 40 kV/mm, corona resistant lifetime of pure PI is about 3 h, while the lifetime of composite film with 20wt% TiO₂ is about 25 h. TiO₂has a high performance in corona resistance forming interphase with polymer and changing the trapping levels of material, facilitating diffusion of space charge and transmission of heat in material. A large of TiO₂ particles can form discharge blocking layer on the surface of films and reduce internal erosion by partial discharge. Therefore, the corona resistant ability of nanocomposite films is significantly improved.

Key words: polyimide, TiO₂, composite film, preparation, corona resistant

CLC Number:

TM215
TQ323

KONG Yu-Nan, YIN Jing-Hua, TIE Wen-Lu, LIU Xiao-Xu, SONG Ming-Xin, LEI Qing-Quan. Preparation and Corona Resistant of Polyimide/TiO₂ Nanocomposite Films[J]. Journal of Inorganic Materials, 2014, 29(1): 98-102.

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Preparation and Corona Resistant of Polyimide/TiO₂ Nanocomposite Films

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