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Preparation and Electrical Properties of 4-allyloxy-2-hydroxybenzophenone Grafted Polypropylene for HVDC Cables

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Abstract

Polypropylene (PP) is considered a promising material for eco-friendly high-voltage direct current (HVDC) cable insulation. However, PP is prone to space charge accumulation under direct current (DC) electric stress, which limits its applications. In this study, 4-allyloxy-2-hydroxybenzophenone (AHB) with polar functional groups and a conjugated structure was grafted onto PP via melt grafting to improve its electrical properties. The effects of several reaction variables, specifically initiator and monomer content, reaction temperature, rotor speed, and grafting yield time were studied, and the optimal grafting conditions were determined. Evidence of grafting was examined by Fourier transform infrared (FTIR) spectroscopy. Moreover, the space charge characteristics, volume resistivity, and DC breakdown strength of the grafted PP were also studied. The FTIR results demonstrated that the AHB monomer was successfully grafted onto PP, and the maximum grafting yield obtained under the optimal grafting conditions was 0.94%. Furthermore, when the grafting yield was 0.73%, the grafted PP effectively inhibited space charge accumulation and exhibited the highest volume resistivity and DC breakdown strength. Thus, this work provides useful ideas for the design and development of environmentally friendly polymer insulating materials for HVDC applications.

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Funding

This research was supported by the National Natural Science Foundation of China (No. 51677045) and Heilongjiang Provincial Natural Science Foundation of China (LH2020E089). We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.

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Authors and Affiliations

  1. College of Material Science & Engineering, Harbin University of Science and Technology, Harbin, 150080, China

    Yue Liang, Ling Weng & Wenlong Zhang

  2. Key laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, China

    Ling Weng & Wenlong Zhang

  3. Yangzhou Longda Electrical Material Co. Ltd, Yangzhou, 225222, China

    Wenlong Zhang

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  1. Yue Liang
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Correspondence to Wenlong Zhang.

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Liang, Y., Weng, L. & Zhang, W. Preparation and Electrical Properties of 4-allyloxy-2-hydroxybenzophenone Grafted Polypropylene for HVDC Cables. J. Electron. Mater. 50, 6228–6236 (2021). https://doi.org/10.1007/s11664-021-09147-5

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