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To address the significant degradation of the energy storage performance of polypropylene (PP) capacitor films under high-temperature and high-electric-field conditions, melt grafting monomer technology was employed to modify polypropylene at the molecular level using 2-furylacetic acid as the monomer. The effects of monomer content and reaction temperature in melt grafting on the energy storage characteristics of the film samples were investigated. 2-furylacetic acid grafted polypropylene capacitor films with excellent high-temperature energy storage properties were prepared, and their structure and performance were characterized and tested. The results show that with the increase of monomer content and reaction temperature, the charge-discharge efficiency of the grafted samples generally first increases and then decreases. Graft modification promotes the increase of internal crystal nuclei in PP, reduces the size of spherulites, effectively increases the trap depth and trap density of the film, reduces the carrier mobility, and improves its electrical strength and energy storage characteristics at high temperatures.

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Study on Properties of Melt Fusion Graft Modified Polypropylene Film

  • 会议论文

  • 发表日期：

    2026年

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  • Lu Li,
  • Zhongyuan Li,
  • Lei Wang,
  • Jianquan Liang,
  • Kexin Zhang,
  • Yue Wang,
  • Ling Weng,
  • Limin Dong

摘要

To address the significant degradation of the energy storage performance of polypropylene (PP) capacitor films under high-temperature and high-electric-field conditions, melt grafting monomer technology was employed to modify polypropylene at the molecular level using 2-furylacetic acid as the monomer. The effects of monomer content and reaction temperature in melt grafting on the energy storage characteristics of the film samples were investigated. 2-furylacetic acid grafted polypropylene capacitor films with excellent high-temperature energy storage properties were prepared, and their structure and performance were characterized and tested. The results show that with the increase of monomer content and reaction temperature, the charge-discharge efficiency of the grafted samples generally first increases and then decreases. Graft modification promotes the increase of internal crystal nuclei in PP, reduces the size of spherulites, effectively increases the trap depth and trap density of the film, reduces the carrier mobility, and improves its electrical strength and energy storage characteristics at high temperatures.