Preparation of polyimide composites reinforced with oxygen doped boron nitride nano-sheet as multifunctional materials

Highlights: • A oxygen doped boron nitride (OBNNS) was synthesized. • The OBNNS can disperse and embed into the PI matrix commendably. • The PI/OBNNS composite can endow the PI with a dramatic increment on thermal, electrical, optical and mechanical properties. -- Abstract: In this article, oxygen doped boron nitride (OBNNS) was selected and introduced into PI to form OBNNS/PI composite films. The thermal, electrical, optical and mechanical properties of the OBNNS/PI composite films were all improved compared to pure PI. Our experimental results shown that the synthesized OBNNS/PI composite with a low OBNNS content (0.25 wt%) have thermal conductivity of 0.291 W·m⁻¹·K⁻¹, tensile strength of 127.1 MPa, elongation at break of 13.3%, and corona resistant life of 9.50 h, all were significantly enhanced compared with that of a pure PI film. This can be attributed the homogeneous and ordered dispersion of OBNNS in PI matrix. The successful preparation of the OBNNS/PI composites will pave a way for the development of multifunctional polyimide-based composites for applications.