期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 138, 期 11, 页码 -出版社
WILEY
DOI: 10.1002/app.50029
关键词
dielectric properties; polyolefins; structure-property relationships
资金
- China Postdoctoral Science Foundation [2019M663699]
- Foundation of National Ministry and Commission [613262]
- Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology [201805056ZD7CG40]
- National Nature Science Foundation of China [51773166, 51573146, 51603167]
The research showed that BOPP films produced by simultaneous biaxial orientation have more evenly dispersed crystal grains, which improves the insulation performance of capacitors.
The most important polymer film used in commercial capacitors is biaxially oriented polypropylene (BOPP), which could be produced by sequentially or simultaneously biaxial orientation after the melt-extrusion. In order to disclose the influence of the stretching technique on the properties of films, the BOPP films with varied thickness were fabricated by sequential and simultaneous orientation, respectively. Compared to the sequentially biaxially stretched films, the crystal grains in the simultaneously biaxially stretched films are more isotropically dispersed. As temperature increases, all the BOPP films exhibit similar dielectric constant, and the simultaneous films have much lower dielectric loss thanks to the finer blended crystalline and amorphous phases. When the film thickness is smaller than 5 mu m, the breakdown field strength, energy density and discharging time of the simultaneous films can be increased by at least 10% comparing to the sequential ones, which is very important for reducing the volume of the film capacitors. All the results suggest the simultaneously biaxial orientation mode shows significant advantages in producing thin BOPP films with better mechanical and electrical properties.
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