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The crystallizability of the isotactic polypropylene (iPP) resin and the microstructure of biaxially orientated polypropylene (BOPP) film are critical to the performance of the capacitor. In this work, the imported and domestic iPP resins were selected, the molecular chain structure and crystalline properties of iPP resins, as well as the microscopic morphology and electrical properties of BOPP films were systematically investigated. The results show that the imported HC300 resins has a wide molecular weight distribution and a low number-average molecular weight. And crystallization temperature of HC300 was lower compared with that of domestic iPP resins. Under the same cooling conditions, the bright spherulites of β crystals formed in HC300, indicating better crystallizability of β crystal. Meanwhile, β crystals play an important role in the formation of crater structure in BOPP films. The BOPP film of HC300 has higher characteristic breakdown strength, related to the resin properties and homogenous crater structure.

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Research on the Microstructure and Properties of Isotactic Polypropylene Resin and Its BOPP Film for Capacitors

  • 会议论文

  • 发表日期：

    2026年

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  • Bo Yang,
  • Jin Zhang,
  • Yong Huang,
  • Chong Zhang,
  • Yaotian Su,
  • Juyang Liu,
  • Shaowei Guo,
  • Zhaoliang Xing

摘要

The crystallizability of the isotactic polypropylene (iPP) resin and the microstructure of biaxially orientated polypropylene (BOPP) film are critical to the performance of the capacitor. In this work, the imported and domestic iPP resins were selected, the molecular chain structure and crystalline properties of iPP resins, as well as the microscopic morphology and electrical properties of BOPP films were systematically investigated. The results show that the imported HC300 resins has a wide molecular weight distribution and a low number-average molecular weight. And crystallization temperature of HC300 was lower compared with that of domestic iPP resins. Under the same cooling conditions, the bright spherulites of β crystals formed in HC300, indicating better crystallizability of β crystal. Meanwhile, β crystals play an important role in the formation of crater structure in BOPP films. The BOPP film of HC300 has higher characteristic breakdown strength, related to the resin properties and homogenous crater structure.