High-Tg shape memory polyimide composites with "spot-plane" directional thermally conduction structure based on AlN nanoparticles and acidified graphene

In order to enhance the thermal conduction property and shorten response time of shape memory polyimide (SMPI), "spot-plane" directional thermally conductive acidified graphene/AlN/SMPI composites were prepared, in which AlN nanoparticles were used as "thermal conduction spots" and acidified graphene was used as twodimensional "thermal conduction planes". The SMPI composite doped with 6 wt% AlN and 0.8 wt% acidified graphene had good heat conducting properties (the in-plane thermal conductivity of 5.90 W m-1 K-1), excellent mechanical propertied (the tensile strength of 134.5 MPa, and Young's modulus of 3.8 GPa), high shape memory transition temperature (at 419 celcius), and great thermal stability and shape memory properties. Compared with SMPI resin matrix, the response time of the acidified graphene/AlN/SMPI composite was shortened by 140 s, only 20 s, and it can be applied in flexible electronics, intelligent response structures and active deformation structures in high-temperature environment.