Title: The microstructure and property study of tri-layer polyimide/Al₂O₃ nanocomposite films

Authors: Hui Shi; Lizhu Liu; Ling Weng; Weiwei Cui

Addresses: College of Material Science and Engineering, Harbin University of Science and Technology, P.O. Box 317, 4 LinYuan Road, Harbin 150040, China ' College of Material Science and Engineering, Harbin University of Science and Technology, P.O. Box 317, 4 LinYuan Road, Harbin 150040, China; Key Laboratory of Engineering Dielectric and its Application, Ministry of Education, Harbin University of Science and Technology, P.O. Box 148, 52 XueFu Road, Harbin 150080, China ' College of Materials Science and Engineering, Harbin University of Science and Technology, P.O. Box 317, 4 LinYuan Road, Harbin 150040, China ' College of Materials Science and Engineering, Harbin University of Science and Technology, P.O. Box 317, 4 LinYuan Road, Harbin 150040, China

Abstract: On the basis of mono-layer composite films, the polyimide/nano-Al₂O₃ tri-layer composite films based on pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA) were prepared by mixing various proportions of nano-Al₂O₃ inorganic particles via in situ polymerisation. Morphology study by scanning electron microscope (SEM) illustrated that the 'sandwich' structure was successfully achieved and nano-Al₂O₃ particles were homogeneously dispersed in the PI matrix. The target tri-layer composite films were studied by thermogravimetry analysis (TGA), and corresponding experimental results showed that same as the mono-layer composite films, tri-layer composite films possessed the superior thermal stability than that of pure film, and the thermal stability was improved steadily along with the increment of nano-Al₂O₃ doping content. Moreover, comparing to the mono-layer composite films, tri-layer PI/Al₂O₃ nanocomposite films had a great deal of improvement in the tensile strength and elongation at break. The tri-layer PI/Al₂O₃ nanocomposite films performed the better electric breakdown strength than that of pure films.

Keywords: polyimide; Al2O3; tri-layer composite films; mechanical properties; thermal properties; electrical properties; aluminium oxide; alumina; pyromellitic dianhydride; PMDA; oxydianiline; ODA; nanoparticles; nanotechnology; thermal stability; tensile strength; nanocomposite films; nanocomposites.

DOI: 10.1504/IJMTM.2016.081595

International Journal of Manufacturing Technology and Management, 2016 Vol.30 No.6, pp.443 - 455

Received: 03 Feb 2015
Accepted: 20 Aug 2015
Published online: 17 Jan 2017 *

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