Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy Composites
Alumina nanowires (Al<sub>2</sub>O<sub>3</sub>-NWs)/epoxy resin composites have been thoroughly studied due to their excellent insulating and dielectric performance. In particular, understanding the effect of nano-alumina with different morphologies on the dielectric performa...
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| Format: | Article |
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MDPI AG
2020-09-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/12/9/2126 |
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| author | Liangsong Huang Xitao Lv Yongzhe Tang Guanghui Ge Peng Zhang Yuxia Li |
| author_facet | Liangsong Huang Xitao Lv Yongzhe Tang Guanghui Ge Peng Zhang Yuxia Li |
| author_sort | Liangsong Huang |
| collection | DOAJ |
| description | Alumina nanowires (Al<sub>2</sub>O<sub>3</sub>-NWs)/epoxy resin composites have been thoroughly studied due to their excellent insulating and dielectric performance. In particular, understanding the effect of nano-alumina with different morphologies on the dielectric performance of composites is of great significance. In this study, Al<sub>2</sub>O<sub>3</sub>-NWs with lengths of approximately 100 nm and diameters of approximately 5 nm were prepared and blended with anepoxy resin to form composites, and the effect of the mass fraction of fillers on the thermal conductivity of the composites was investigated. Specifically, the effect of alumina fillers with ananowire structure on the insulating and dielectric performance and breakdown strength of the epoxy composites were analyzed. The influence principle of the interfacial effect and heat accumulation on the dielectric and insulating properties of the composites were described. The results demonstrated that the thermal conductivity of Al<sub>2</sub>O<sub>3</sub>-NWs/epoxy resin composites was higher than that of the bare epoxy resin. The thermal conductivity of Al<sub>2</sub>O<sub>3</sub>-NWs/epoxy resin composites increased with increasing mass fraction of fillers. When the mass fraction of fillers was 10%, the thermal conductivity of the composite was 134% higher than that of the epoxy resin matrix. The volume resistivity of the composites first increased and then decreased as the mass fraction of fillers increased, while the dielectric constant of the composites increased with increasing mass fraction of fillers and decreasing frequency. The dielectric loss of the composites decreased and then increased as the mass fraction of fillers increased, and it increased with increasing frequency. Additionally, the alternating current breakdown strength of the composites first increased and then decreased withincreasingmass fraction of fillers. |
| first_indexed | 2024-03-10T16:15:25Z |
| format | Article |
| id | doaj.art-32296d0b0b62430a9299a6b48f3a52fc |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T16:15:25Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-32296d0b0b62430a9299a6b48f3a52fc2023-11-20T14:06:40ZengMDPI AGPolymers2073-43602020-09-01129212610.3390/polym12092126Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy CompositesLiangsong Huang0Xitao Lv1Yongzhe Tang2Guanghui Ge3Peng Zhang4Yuxia Li5Key Laboratory for Robot Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao 266590, ChinaKey Laboratory for Robot Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao 266590, ChinaKey Laboratory for Robot Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao 266590, ChinaKey Laboratory for Robot Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao 266590, ChinaKey Laboratory for Robot Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao 266590, ChinaKey Laboratory for Robot Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao 266590, ChinaAlumina nanowires (Al<sub>2</sub>O<sub>3</sub>-NWs)/epoxy resin composites have been thoroughly studied due to their excellent insulating and dielectric performance. In particular, understanding the effect of nano-alumina with different morphologies on the dielectric performance of composites is of great significance. In this study, Al<sub>2</sub>O<sub>3</sub>-NWs with lengths of approximately 100 nm and diameters of approximately 5 nm were prepared and blended with anepoxy resin to form composites, and the effect of the mass fraction of fillers on the thermal conductivity of the composites was investigated. Specifically, the effect of alumina fillers with ananowire structure on the insulating and dielectric performance and breakdown strength of the epoxy composites were analyzed. The influence principle of the interfacial effect and heat accumulation on the dielectric and insulating properties of the composites were described. The results demonstrated that the thermal conductivity of Al<sub>2</sub>O<sub>3</sub>-NWs/epoxy resin composites was higher than that of the bare epoxy resin. The thermal conductivity of Al<sub>2</sub>O<sub>3</sub>-NWs/epoxy resin composites increased with increasing mass fraction of fillers. When the mass fraction of fillers was 10%, the thermal conductivity of the composite was 134% higher than that of the epoxy resin matrix. The volume resistivity of the composites first increased and then decreased as the mass fraction of fillers increased, while the dielectric constant of the composites increased with increasing mass fraction of fillers and decreasing frequency. The dielectric loss of the composites decreased and then increased as the mass fraction of fillers increased, and it increased with increasing frequency. Additionally, the alternating current breakdown strength of the composites first increased and then decreased withincreasingmass fraction of fillers.https://www.mdpi.com/2073-4360/12/9/2126Al<sub>2</sub>O<sub>3</sub>-NWscompositethermal conductivityvolume resistivitydielectric performancebreakdown strength |
| spellingShingle | Liangsong Huang Xitao Lv Yongzhe Tang Guanghui Ge Peng Zhang Yuxia Li Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy Composites Polymers Al<sub>2</sub>O<sub>3</sub>-NWs composite thermal conductivity volume resistivity dielectric performance breakdown strength |
| title | Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy Composites |
| title_full | Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy Composites |
| title_fullStr | Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy Composites |
| title_full_unstemmed | Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy Composites |
| title_short | Effect of Alumina Nanowires on the Thermal Conductivity and Electrical Performance of Epoxy Composites |
| title_sort | effect of alumina nanowires on the thermal conductivity and electrical performance of epoxy composites |
| topic | Al<sub>2</sub>O<sub>3</sub>-NWs composite thermal conductivity volume resistivity dielectric performance breakdown strength |
| url | https://www.mdpi.com/2073-4360/12/9/2126 |
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