Preparation and Performance Study on Micro-nano Laminated Polypropylene Dielectric Film
For solving such problems as low dielectric constant and low dielectric field strength of polypro-pylene 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 polypro-pylene 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 improve-ment of the dielectric performance of a single material.
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