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Effect of imidization process on the performance of PI/nano-Al2O3 three layer composite film

Lizhu Liu (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, China)
Hongju He (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, China)
Ling Weng (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, China and Key Laboratory of Engineering Dielectric and Its Application (Harbin University of Science and Technology), Ministry of Education, Harbin, China)
Xiaorui Zhang (School of Material Science and Engineering, Harbin University of Science and Technology, Harbin, China and Key Laboratory of Engineering Dielectric and Its Application (Harbin University of Science and Technology), Ministry of Education, Harbin, China)

Pigment & Resin Technology

ISSN: 0369-9420

Publication date: 3 July 2017

Abstract

Purpose

The purpose of this paper was to comprehensively understand the effects of imidization process on the structure and properties of polyimide (PI) films through the preparation and characterization of a variety of PI/aluminium oxide (Al2O3) nanocomposite films by using several imidization-based strategies.

Design/methodology/approach

Poly(amic acid) (PAA) containing different amounts of inorganic materials (namely, 0 Wt.%, 4 Wt.%, 8 Wt.%, 12 Wt.% and 16 Wt.%) was synthesized by using pyromellitic dianhydride and 4,4-diaminodiphenyl ether as raw material and N,N-dimethylacetamide as solvent. Subsequently, the solution obtained was casted on a glass substrate and dried by the means of various curing processes. The micro-structure, Fourier transform–infrared spectral features, breakdown field strength, dielectric properties and the corona-resistant time parameters of films were achieved.

Findings

The imidization process influences substantially the properties of composite films. Therefore, as the imidization rate is increased, the corona-resistant time and the electrical breakdown strength of composite films are also improved, while the dielectric constant faces a+ decreasing.

Research limitations/implications

In this paper, the impact of imidization process on the performance of PI/nano-Al2O3 three-layered composite film is reported. However, there are multiple factors governing these systems (such as, interlayer thickness ratio and humidity), which are not discussed herein.

Originality/value

The current study expounds the relationship between imidization ratios as well as the effect of imidization ratio on the performance of the film.

Keywords

Acknowledgements

The authors are thankful for the financial support from the National Natural Science Foundation of China (No. 51177030) and the Natural Science Foundation of Heilongjiang Province of China (No. E201224).

Citation

Liu, L., He, H., Weng, L. and Zhang, X. (2017), "Effect of imidization process on the performance of PI/nano-Al2O3 three layer composite film", Pigment & Resin Technology, Vol. 46 No. 4, pp. 327-331. https://doi.org/10.1108/PRT-03-2016-0031

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited