WANG Xinjie, HUANG Lei, SONG Yanhui, et al. Microstructural Evolution of Uniaxially Stretched Polypropylene Films and Its Effect on Electrical Properties[J]. 2025, 51(5): 2260-2267.
WANG Xinjie, HUANG Lei, SONG Yanhui, et al. Microstructural Evolution of Uniaxially Stretched Polypropylene Films and Its Effect on Electrical Properties[J]. 2025, 51(5): 2260-2267.DOI: 10.13336/j.1003-6520.hve.20241655.
a semi-crystalline polymer widely used in film capacitors
has a crystalline structure that influences the electrical properties of the material
leading to variations in the energy storage performance of capacitors. Controlling the crystalline structure of PP to better regulate the electrical properties of PP films is key to enhancing the energy storage characteristics of capacitors. In this study
a series of uniaxially stretched polypropylene films with varying thicknesses were prepared. The differences in their crystalline morphology were characterized using polarizing microscopy
atomic force microscopy
two-dimensional X-ray scattering
and differential scanning calorimetry. Subsequent investigations were conducted on the trap parameters
DC breakdown strength
dielectric properties
and energy storage characteristics of the oriented PP films. The results indicate that thinner PP films not only improve the surface roughness of the films but also facilitate the formation of highly oriented shish-kebab fibrous crystalline structures. The highly oriented crystalline structure helps to optimize the trap distribution within the material
thereby promoting the dissipation of charges on the film's surface and enhancing the insulating performance of the material.