Effects of Water Absorption on the Insulating Properties of Polypropylene

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 absorptio...

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Published inEnergies (Basel) Vol. 17; no. 18; p. 4576
Main Authors Xi, Rui, Jiang, Qiyang, Cao, Liang, Li, Chuping, He, Jiaxun, Zhang, Ya, He, Gaohui, Gui, Yingang, Tang, Chao
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2024
Subjects
Cables
Dielectric properties
Diffraction
diffusion process
Electric fields
Electric properties
Fourier transforms
insulating properties
Polypropylene
Spectrum analysis
Water
water absorption
X-rays
China
United States > US
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en17184576