Interface properties of polymer nanocomposites

The development of HVDC transmission technology in China puts forward higher requests to the insulating properties of dielectric materials, polymer nanodielectric materials have drawn extensive attention for their excellent properties, and the interface has become a hot topic. The interface is the nanoscale transition region between nano-filler and polymer matrix, due to its special formation mechanism, the interface has different properties from the polymer matrix and nano-filler. Meanwhile, because the interface plays a leading role in the composite materials, its microstructure and properties will directly influence the macroscopic properties of the nanocomposite. This paper reviewed the introduced formation mechanism, structure and model of the interface, discussed its influence on aggregation structure of polymer and the trap theory and analyzed the mechanism of interface in the electrical properties of nanocomposites. Finally the study on local dielectric properties of the interface by using electrostatic force microscopy (EFM) was discussed.