Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing Process
Carbon nanotube (CNT) film possesses excellent mechanical and piezoresistivity, which may act as a sensor for process monitoring and reinforcement of the final composite. This paper prepared CNT/epoxy composite film via the solution dipping method and investigated the electrical resistance variation...
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MDPI AG
2022-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/20/3552 |
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| author | Fei Xing Min Li Shaokai Wang Yizhuo Gu Wei Zhang Yanjie Wang |
| author_facet | Fei Xing Min Li Shaokai Wang Yizhuo Gu Wei Zhang Yanjie Wang |
| author_sort | Fei Xing |
| collection | DOAJ |
| description | Carbon nanotube (CNT) film possesses excellent mechanical and piezoresistivity, which may act as a sensor for process monitoring and reinforcement of the final composite. This paper prepared CNT/epoxy composite film via the solution dipping method and investigated the electrical resistance variation (Δ<i>R/R</i><sub>0</sub>) of CNT/epoxy composite film during the curing process. The temperature dependence of electrical resistance was found to be closely related to resin rheological properties, thermal expansion, and curing shrinkage. The results show that two opposing effects on electrical resistivity occur at the initial heating stage, including thermal expansion and condensation caused by the wetting tension of the liquid resin. The lower resin content causes more apparent secondary impregnation and electrical resistivity change. When the resin viscosity remains steady during the heating stage, the electrical resistance increases with an increase in temperature due to thermal expansion. Approaching gel time, the electrical resistance drops due to the crosslink shrinkage of epoxy resin. The internal stress caused by curing shrinkage at the high-temperature platform results in an increase in electrical resistance. The temperature coefficient of resistance becomes larger with an increase in resin content. At the isothermal stage, an increase in Δ<i>R/R</i><sub>0</sub> value becomes less obvious with a decrease in resin content, and Δ<i>R/R</i><sub>0</sub> even shows a decreasing tendency. |
| first_indexed | 2024-03-09T19:40:12Z |
| format | Article |
| id | doaj.art-1d40f8af1f744f64a493c4cb9757c30b |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T19:40:12Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-1d40f8af1f744f64a493c4cb9757c30b2023-11-24T01:38:59ZengMDPI AGNanomaterials2079-49912022-10-011220355210.3390/nano12203552Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing ProcessFei Xing0Min Li1Shaokai Wang2Yizhuo Gu3Wei Zhang4Yanjie Wang5Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, ChinaKey Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, ChinaKey Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, ChinaResearch Institute of Frontier Science, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, ChinaResearch Institute of Frontier Science, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, ChinaResearch Institute of Frontier Science, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, ChinaCarbon nanotube (CNT) film possesses excellent mechanical and piezoresistivity, which may act as a sensor for process monitoring and reinforcement of the final composite. This paper prepared CNT/epoxy composite film via the solution dipping method and investigated the electrical resistance variation (Δ<i>R/R</i><sub>0</sub>) of CNT/epoxy composite film during the curing process. The temperature dependence of electrical resistance was found to be closely related to resin rheological properties, thermal expansion, and curing shrinkage. The results show that two opposing effects on electrical resistivity occur at the initial heating stage, including thermal expansion and condensation caused by the wetting tension of the liquid resin. The lower resin content causes more apparent secondary impregnation and electrical resistivity change. When the resin viscosity remains steady during the heating stage, the electrical resistance increases with an increase in temperature due to thermal expansion. Approaching gel time, the electrical resistance drops due to the crosslink shrinkage of epoxy resin. The internal stress caused by curing shrinkage at the high-temperature platform results in an increase in electrical resistance. The temperature coefficient of resistance becomes larger with an increase in resin content. At the isothermal stage, an increase in Δ<i>R/R</i><sub>0</sub> value becomes less obvious with a decrease in resin content, and Δ<i>R/R</i><sub>0</sub> even shows a decreasing tendency.https://www.mdpi.com/2079-4991/12/20/3552carbon nanotube composite filmprocess monitoringtemperature dependencecuring shrinkagethermal expansion |
| spellingShingle | Fei Xing Min Li Shaokai Wang Yizhuo Gu Wei Zhang Yanjie Wang Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing Process Nanomaterials carbon nanotube composite film process monitoring temperature dependence curing shrinkage thermal expansion |
| title | Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing Process |
| title_full | Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing Process |
| title_fullStr | Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing Process |
| title_full_unstemmed | Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing Process |
| title_short | Temperature Dependence of Electrical Resistance in Carbon Nanotube Composite Film during Curing Process |
| title_sort | temperature dependence of electrical resistance in carbon nanotube composite film during curing process |
| topic | carbon nanotube composite film process monitoring temperature dependence curing shrinkage thermal expansion |
| url | https://www.mdpi.com/2079-4991/12/20/3552 |
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