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Effects of coupling agents on structure and properties of polyimide/Al 2 O 3 nanocomposite films

Effects of coupling agents on structure and properties of polyimide/Al 2 O 3 nanocomposite films Purpose – The purpose of this paper is to investigate the effects of coupling agents on the structure and properties of the nanocomposite films and clarify their mechanism. Polyimide (PI)/Al 2 O 3 nanocomposite films were prepared using different coupling agents. Design/methodology/approach – Poly(amic acid) (PAA) was firstly synthesised from appropriate pyromellitic diannanocomposite and oxydianiline in N‐dimethylacetamide. Calculated amount of nano‐Al 2 O 3 particles modified by different coupling agents (KH550, KH560, KH570 and AE3012) were added to PAA solution by an ultrasonic‐mechanical method and PI/nano‐Al 2 O 3 film was fabricated by heat curing. The microstructure, thermal stability, mechanical properties and electric breakdown strength of the films were characterised. Findings – The addition of coupling agents could greatly improve the dispersion homogeneity of Al 2 O 3 nano‐particles in PI matrix. Results of corresponding characterisations indicated that both the thermal stability and mechanical properties of PI/Al 2 O 3 nanocomposite film with KH550 were greater/better than others, while AE3012 could improve the electric breakdown strength. Research limitations/implications – In the present discussion, the effects of different coupling agents, KH550, KH560, KH570 and AE3012, were investigated. Results of this research work would be beneficial to an in‐depth understanding on the relationship between microstructure and properties of PI composites, and further promote the development of the high‐performance PI insulating materials. Originality/value – The four coupling agents, KH550, KH560, KH570 and AE3012, were firstly used to disperse the nano‐Al 2 O 3 particles in PI matrix. The effects of coupling agents on microstructure and properties of composites were discussed by the authors in detail. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Pigment & Resin Technology Emerald Publishing

Effects of coupling agents on structure and properties of polyimide/Al 2 O 3 nanocomposite films

L.Z. Liu; L. Weng; Y.X. Song; L. Gao; H. Zhao; Q.Q. Lei
Pigment & Resin Technology , Volume 40 (4): 7 – Jul 5, 2011
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Publisher
Emerald Publishing
Copyright
Copyright © 2011 Emerald Group Publishing Limited. All rights reserved.
ISSN
0369-9420
DOI
10.1108/03699421111147281
Publisher site
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Abstract

Purpose – The purpose of this paper is to investigate the effects of coupling agents on the structure and properties of the nanocomposite films and clarify their mechanism. Polyimide (PI)/Al 2 O 3 nanocomposite films were prepared using different coupling agents. Design/methodology/approach – Poly(amic acid) (PAA) was firstly synthesised from appropriate pyromellitic diannanocomposite and oxydianiline in N‐dimethylacetamide. Calculated amount of nano‐Al 2 O 3 particles modified by different coupling agents (KH550, KH560, KH570 and AE3012) were added to PAA solution by an ultrasonic‐mechanical method and PI/nano‐Al 2 O 3 film was fabricated by heat curing. The microstructure, thermal stability, mechanical properties and electric breakdown strength of the films were characterised. Findings – The addition of coupling agents could greatly improve the dispersion homogeneity of Al 2 O 3 nano‐particles in PI matrix. Results of corresponding characterisations indicated that both the thermal stability and mechanical properties of PI/Al 2 O 3 nanocomposite film with KH550 were greater/better than others, while AE3012 could improve the electric breakdown strength. Research limitations/implications – In the present discussion, the effects of different coupling agents, KH550, KH560, KH570 and AE3012, were investigated. Results of this research work would be beneficial to an in‐depth understanding on the relationship between microstructure and properties of PI composites, and further promote the development of the high‐performance PI insulating materials. Originality/value – The four coupling agents, KH550, KH560, KH570 and AE3012, were firstly used to disperse the nano‐Al 2 O 3 particles in PI matrix. The effects of coupling agents on microstructure and properties of composites were discussed by the authors in detail.

Journal

Pigment & Resin Technology – Emerald Publishing

Published: Jul 5, 2011

Keywords: Composite materials; Film properties; Mechanical properties of materials; Microstructure; Thermal analysis; Thermal stability; Films (states of matter)

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