For solving such problems as low dielectric constant and low dielectric field strength of polypropylene film

it is innovatively proposed to prepare polypropylene films with different numbers of layers (1 layer

16 layers

256 layers) by adopting the micro-nano-layered extrusion technology

and the dielectric constant

dielectric loss

breakdown field strength

crystallinity

and mechanical properties of polypropylene film with different numbers of layers are characterized. The results show that

compared to 1-layer polypropylene film

the dielectric constant of 16-layer and 256-layer polypropylene film is increased by 23.3% and 36.3%

the dielectric loss is decreased by 6.25% and 45.8%

the breakdown field strength is increased by 11% and 23.3%

and the tensile strength is increased by 5.3% and 18.98%

respectively. The crystalinity is also increased witht the increase of the number of layer. The technology has a significant improvement effect on the dielectric performance of polypropylene film. This work provides a new idea for the improvement of the dielectric performance of a single material.