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Preparation and properties of sandwich structured aramid nanofiber composite dielectric films with high-temperature resistance
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Youhao XIONG1, 2, Xirui LIU1, 2, Tianxu ZHANG1, 2, Haonan YAN1, 2, Yuqi MA1, 2, Yongsheng ZHAO1, 2, 3, 4, Guangcheng ZHANG1, 2
Insulating Materials | 2023, 56(9) : 23 - 28
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Insulating Materials | 2023, 56(9): 23-28
• Material Research •
Preparation and properties of sandwich structured aramid nanofiber composite dielectric films with high-temperature resistance
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Youhao XIONG1, 2, Xirui LIU1, 2, Tianxu ZHANG1, 2, Haonan YAN1, 2, Yuqi MA1, 2, Yongsheng ZHAO1, 2, 3, 4, Guangcheng ZHANG1, 2
Affiliations
  • 1School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi′an 710072, China
  • 2Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi′an 710072, China
  • 3State Key Laboratory of Polymer Material and Engineering, Sichuan University, Chengdu 610065, China
  • 4State Key Laboratory of Electrical Insulation and Power Equipment, Xi′an Jiaotong University, Xi′an 710049, China
Published: 2023-09-20 doi: 10.16790/j.cnki.1009-9239.im.2023.09.004
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Organic-inorganic composite dielectrics are often difficult to have both high dielectric constant and high electric strength. In this paper, a sandwich structured composite film was prepared by using aramid nanofibers (ANF) as high-temperature resistant matrix, boron nitride nanosheets (BNNS) as electrical breakdown enhancer, and barium titanate particles (BT) as dielectric modifier through step-by-step vacuum filtration and hot-pressing method, and the effects of sandwich structure and different modifier content on the microstructure and dielectric properties of the composite films were studied. The results show that the sandwich structured composite films have high flexibility and excellent high-temperature stability. The addition of BT decreases the electric strength of single layer and sandwich structured composite films, while the addition of BNNS increases the electric strength of the composite films. The individual addition of BT or BNNS can increase the dielectric constant of composite films at low frequency, while the simultaneous addition of BT and BNNS can increase the dielectric constant in wide frequency domain. Therefore, a composite film with balanced dielectric properties and electric strength can be obtained by adjusting the sandwich structure and modifier content in each layer. When taking the ANF/BNNS film with 10% mass fraction of BNNS as the outer layer and the ANF/BT film with 10% mass fraction of BT as the core layer, the dielectric constant, dielectric loss factor, and electric strength of the prepared composite film is 1.41 (1 kHz), 0.013 (1 kHz), and 13.3 kV/mm, respectively.

high-temperature resistant dielectrics  /  aramid nanofibers  /  sandwich structure  /  dielectric properties
Youhao XIONG, Xirui LIU, Tianxu ZHANG, Haonan YAN, Yuqi MA, Yongsheng ZHAO, Guangcheng ZHANG. Preparation and properties of sandwich structured aramid nanofiber composite dielectric films with high-temperature resistance[J]. Insulating Materials, 2023 , 56 (9) : 23 -28 . DOI: 10.16790/j.cnki.1009-9239.im.2023.09.004
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2023.09.004
  • Receive Date：2022-07-07
  • Online Date：2025-11-24
  • Published：2023-09-20
Article Data
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History
  • Received：2022-07-07
  • Revised：2023-02-27
Funding
Affiliations
    1School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi′an 710072, China
    2Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi′an 710072, China
    3State Key Laboratory of Polymer Material and Engineering, Sichuan University, Chengdu 610065, China
    4State Key Laboratory of Electrical Insulation and Power Equipment, Xi′an Jiaotong University, Xi′an 710049, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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