Effects of Water Absorption on the Insulating Properties of Polypropylene

Rui Xi, Qiyang Jiang, Liang Cao (), Chuping Li, Jiaxun He, Ya Zhang, Gaohui He, Yingang Gui and Chao Tang ()
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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

Energies, 2024, vol. 17, issue 18, 1-13

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.

Keywords: water absorption; insulating properties; polypropylene; diffusion process (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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