Polyimide/BaTiO3/MWCNTs three-phase nanocomposites fabricated by electrospinning with enhanced dielectric properties

A three-phase nanocomposite with outstanding dielectric properties was prepared via electrospinning and hot-pressing, by which multi-walled carbon nanotubes (MWCNTs) were homogeneously dispersed in polyimide (PI) matrix and separated by the BaTiO3 particles (BTPs). The fairly enhanced dielectric properties were due to synergistic enhancing of the ferroelectric ceramic filler BTPs and conductive filler MWCNTs. The investigation shows that the dielectric permittivity of the as-fabricated three-phase nanocomposites with 40 vol% BTPs and 10 vol% MWCNTs loads is as high as 1061.98 at 100 Hz with a lower dielectric loss of 0.23, and the corresponding energy storage density is 4.773 J/cm(3), 11 times that of the pure polyimide. The three-phase nanocomposites with enhanced dielectric properties also show excellent thermal properties and will be attractive in application in modern microelectronics. (C) 2014 Elsevier B.V. All rights reserved.