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How the biaxially stretching mode influence dielectric and energy storage properties of polypropylene films
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-10-09 , DOI: 10.1002/app.50029 Jie Xiong 1 , Xin Wang 2 , Xiao Zhang 2 , Yunchuan Xie 1 , Junyong Lu 2 , Zhicheng Zhang 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-10-09 , DOI: 10.1002/app.50029 Jie Xiong 1 , Xin Wang 2 , Xiao Zhang 2 , Yunchuan Xie 1 , Junyong Lu 2 , Zhicheng Zhang 1
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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 μm, 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.
中文翻译：
双轴拉伸模式如何影响聚丙烯薄膜的介电和储能性能
商业电容器中最重要的聚合物薄膜是双轴取向聚丙烯（BOPP），可以通过在熔融挤出后顺序或同时进行双轴取向来生产。为了揭示拉伸技术对薄膜性能的影响，分别通过顺序和同时取向制备了厚度不同的BOPP薄膜。与顺序双轴拉伸膜相比，同时双轴拉伸膜中的晶粒更各向同性地分散。随着温度的升高，所有BOPP膜均表现出相似的介电常数，而同时的膜由于晶相和非晶相的混合更细，介电损耗要低得多。当膜厚度小于5μm时，击穿场强 与顺序薄膜相比，同时薄膜的能量密度和放电时间可以增加至少10％，这对于减小薄膜电容器的体积非常重要。所有结果表明，同时双轴取向模式在生产具有更好的机械和电气性能的薄BOPP薄膜方面显示出显着的优势。
更新日期：2020-12-10
中文翻译：
双轴拉伸模式如何影响聚丙烯薄膜的介电和储能性能
商业电容器中最重要的聚合物薄膜是双轴取向聚丙烯（BOPP），可以通过在熔融挤出后顺序或同时进行双轴取向来生产。为了揭示拉伸技术对薄膜性能的影响，分别通过顺序和同时取向制备了厚度不同的BOPP薄膜。与顺序双轴拉伸膜相比，同时双轴拉伸膜中的晶粒更各向同性地分散。随着温度的升高，所有BOPP膜均表现出相似的介电常数，而同时的膜由于晶相和非晶相的混合更细，介电损耗要低得多。当膜厚度小于5μm时，击穿场强 与顺序薄膜相比，同时薄膜的能量密度和放电时间可以增加至少10％，这对于减小薄膜电容器的体积非常重要。所有结果表明，同时双轴取向模式在生产具有更好的机械和电气性能的薄BOPP薄膜方面显示出显着的优势。
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