Abstract
Nano-sized Al2O3/polyimide composite films based on Pyromellitic dianhydride(PMDA) and 4,4’-Oxydianiline(ODA) were synthesized by addition with different contents of nano-sized Al2O3 via in situ polymerization. Before addition, nano-Al2O3 particles were firstly modified by coupling agent DB550. The morphology, structure and properties including the mechanical and electrical properties were investigated. SEM microstructures analysis result indicated that the inorganic particles were homogenously dispersed in the polyimide matrix by means of the ultrasonic-mechanical method and the treatment of coupling agent DB550. XRD analysis showed that the addition of nano Al2O3 particles destroyed the molecular order of the PI matrix. Moreover, with the increased in Al2O3 content, the weaken effect on the molecular order also increased. The mechanical property decreased with the increase of Al2O3 content. Better electric breakdown strength could be achieved if the pure polyimide films were incorporated with nano-Al2O3 particles.
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