In this paper, a novel modification method for biaxially oriented polypropylene (BOPP) membranes is proposed based on surface-grafting technology. The experimental results show that, compared with the pristine samples, the surface-grafted films show better breakdown strength under different voltage stress especially at higher temperatures (85 °C). The DC withstand strength of the surface-grafted PP membranes grows by 42.7% from 386.4 to 551.2 kV/mm. The breakdown strength climbs by 63.5% from 305.9 to 500.2 kV/mm under DC superimposed pulse voltage. Under DC superimposed harmonic stress, the breakdown strength is increased from 175.6 to 587.4 kV/mm by 234%. The influence of surface modification on charge transmission behavior is proposed based on the Density Functional Theory (DFT) simulation. This research provides a theoretical and methodological reference for performance optimization by surface modification for BOPP capacitors.

中文翻译：

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基于表面接枝的BOPP电容器薄膜的高温击穿性能


本文提出了一种基于表面接枝技术的双向拉伸聚丙烯（BOPP）膜的新型改性方法。实验结果表明，与原始样品相比，表面接枝薄膜在不同电压应力下尤其是在较高温度（85℃）下表现出更好的击穿强度。表面接枝PP膜的直流耐受强度从386.4 kV/mm提高到551.2 kV/mm，增长了42.7%。在直流叠加脉冲电压下，击穿强度从305.9 kV/mm上升到500.2 kV/mm，提高了63.5%。在直流叠加谐波应力下，击穿强度从175.6 kV/mm提高到587.4 kV/mm，提高了234%。基于密度泛函理论（DFT）模拟提出了表面改性对电荷传输行为的影响。该研究为BOPP电容器的表面改性性能优化提供了理论和方法参考。