Fabrication and Dielectric Characterization of Advanced BaTiO₃/Polyimide Nanocomposite Films with High Thermal Stability

Abstract

Barium titanate/polyimide (BaTiO3/PI) nanocomposite films with high dielectric permittivity (20), high breakdown strength (67 MV m−1), and high thermal stability are prepared by an in‐situ polymerization process. A very thin polymer layer (about 5 nm) is coated on the surface of nanosized BaTiO3 particles to form a core–shell‐like structure, which can guarantee homogeneous dispersion of the BaTiO3 particles in the PI matrix. It is confirmed that the core–shell‐like structure originates from both the electrostatic attraction between the precursor poly(amic acid) (PAA) and the BaTiO3 particles and the hydrogen bond interaction between PI and the BaTiO3 particles. Such a structure also has some influence on the dielectric properties and breakdown strength of films. After casting and degassing of the sticky film, the dielectric permittivity of the nanocomposite film is close to or even higher than that of submicrocomposite films, which is attributed to the advanced interfacial structure between the BaTiO3 and PI phases.

Synthesis and mechanical properties of polybenzimidazole nanocomposites reinforced by vapor grown carbon nanofibers

“…Normally, the fillers of the nanocomposites are layered silicate [9], clay [10,11] and metal oxide nanoparticles [12,13]. Recently, Carbon nanotubes (CNTs) and Carbon nanofibers (CNFs) are considered as the ideal reinforcement fillers for preparing nanocomposites owing to their outstanding mechanical characteristics, extremely large interfacial contact area, high aspect ratio, and low mass density [14][15][16][17][18].…”

Research Update: Polyimide/CaCu3Ti4O12 nanofiber functional hybrid films with improved dielectric properties

“…11,12 Embedding ferroelectric ceramic powders and conductive fillers with polymers are two effective ways. The biggest problem of dispersing ferroelectric ceramic powders such as Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT), Pb(Zr,Ti)O 3 (PZT), and BaTiO 3 (BT) into polymer matrix is that the dielectric permittivity is still very low (ε < 50) even with high ceramic loading, [13][14][15][16] let alone the flexibility which is inversely proportional to volume fraction of the filler. Moreover, high loss tangent and conductivity due to insulator-conductor transition of percolative a Author to whom correspondence should be addressed.…”

Effect of Nanoparticle Size on the Interface Bond Energy in KTa0.5Nb0.5O3/Polyimide Composites

“…Ceramic/polymer composite materials have been considered as one of the most promising materials because they could integrate the advantages of the two phases, which is the good dielectric properties of ceramic materials and the good processing properties and mechanic strength of polymer materials, and the size of the doping particles has a close relation with the dielectric properties of the composites [18,19]. In this paper, the composites of PI and the potassium tantalum niobate nanoparticles (KTa 0.5 Nb 0.5 O 3 , KTN) with different size (0.4 nm, 0.5 nm, 0.6 nm, 0.8 nm, 1.2 nm, and 1.4 nm) have been simulated using the molecular dynamics method.…”