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

• Three-phase PI/BaTiO3/MWCNTs dielectric nanocomposites were fabricated by electrospinning.
• Highly enhanced dielectric permittivity, low dielectric loss, and high energy storage density.
• Discrete conductive micro-networks were formed in the polymer matrix.
• Excellent thermal 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/cm3, 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.

A three-phase PI/BaTiO3/MWCNTs nanocomposite with outstanding dielectric properties was prepared via electrospinning and hot-pressing. The multi-wall carbon nanotubes (MWCNTs) were homogeneously dispersed in PI matrix and separated by BaTiO3 particles (BTPs). The fairly enhanced dielectric properties were due to the synergistic enhancing of the ferroelectric ceramic filler BTPs and conductive filler MWCNTs.Figure optionsDownload as PowerPoint slide