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Effects of Water Absorption on the Insulating Properties of Polypropylene

Author

Listed:
  • Rui Xi

    (College of Engineering and Technology, Southwest University, Chongqing 400715, China)

  • Qiyang Jiang

    (College of Engineering and Technology, Southwest University, Chongqing 400715, China)

  • Liang Cao

    (College of Engineering and Technology, Southwest University, Chongqing 400715, China)

  • Chuping Li

    (Chongqing Taishan Cable Co., Ltd., Chongqing 401125, China)

  • Jiaxun He

    (Chongqing Taishan Cable Co., Ltd., Chongqing 401125, China)

  • Ya Zhang

    (Chongqing Taishan Cable Co., Ltd., Chongqing 401125, China)

  • Gaohui He

    (College of Engineering and Technology, Southwest University, Chongqing 400715, China)

  • Yingang Gui

    (College of Engineering and Technology, Southwest University, Chongqing 400715, China)

  • Chao Tang

    (College of Engineering and Technology, Southwest University, Chongqing 400715, China)

Abstract

Moisture has been a crucial problem during the operation of cable systems. When we are faced with polypropylene (PP)-based insulation for the development of cable systems, there are few reports on the effects of water intrusion on the electrical performances of PP. In this study, the water absorption characteristics of isotactic PP (iPP) and atactic PP (aPP), as well as their effects on volume resistivity and relative permittivity, were investigated. The structure evolution during the water absorption process of the two PPs was also compared via infrared spectra and X-ray diffraction analyses. The results show that both of the two PPs show a saturation of water absorption at ~216 h, even though there are structural differences. And water intrusion into bulk could increase the interplanar spacing of iPP while decreasing the interplanar spacing of aPP. Moreover, with the increase in water absorption, the volume resistivity of the two PPs show a decreasing trend while the relative permittivity presents an increasing behavior, which shows an almost linear correlation.

Suggested Citation

  • Rui Xi & Qiyang Jiang & Liang Cao & Chuping Li & Jiaxun He & Ya Zhang & Gaohui He & Yingang Gui & Chao Tang, 2024. "Effects of Water Absorption on the Insulating Properties of Polypropylene," Energies, MDPI, vol. 17(18), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:18:p:4576-:d:1476698
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