Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide Aerogel
Aerogel materials are used in various fields, but there is a shortage of aerogel materials with an excellent combination of mechanical properties, thermal stability, and easy preparation. In this study, polyimide aerogel materials with superior mechanical properties, thermal stability, and low therm...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/14/2818 |
| _version_ | 1797433223675904000 |
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| author | Liyao Xiong Weijie Zheng Shenglong Cao Yuying Zheng |
| author_facet | Liyao Xiong Weijie Zheng Shenglong Cao Yuying Zheng |
| author_sort | Liyao Xiong |
| collection | DOAJ |
| description | Aerogel materials are used in various fields, but there is a shortage of aerogel materials with an excellent combination of mechanical properties, thermal stability, and easy preparation. In this study, polyimide aerogel materials with superior mechanical properties, thermal stability, and low thermal conductivity were prepared by forming a double-gel system in the liquid phase. The amino-modified gel, prepared by coating SiO<sub>2</sub> nano-microspheres with GO through a modified sol-gel method (SiO<sub>2</sub>@GO-NH<sub>2</sub>), was subsequently homogeneously dispersed with PAA wet gel in water to form a double-gel system. The construction of a double-gel system enabled the PI aerogel to shape a unique honeycomb porous structure and a multi-layered interface of PI/SiO<sub>2</sub>/GO. The final obtained PI aerogel possessed effective thermal conductivity (0.0309 W/m·K) and a high specific modulus (46.19 m<sup>2</sup>/s<sup>2</sup>). In addition, the high thermal stability (543.80 °C in Ar atmosphere) and the ability to retain properties under heat treatment proved its durability in high thermal environments. The hydrophobicity (131.55°) proves its resistance to water from the environment. The excellent performance of this PI aerogel and its durability in thermal working environments make it possible to be applied in varied industrial and research fields, such as construction and energy, where heat and thermal insulation are required. |
| first_indexed | 2024-03-09T10:13:59Z |
| format | Article |
| id | doaj.art-f214088653844cb8914b273152455f77 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T10:13:59Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-f214088653844cb8914b273152455f772023-12-01T22:36:25ZengMDPI AGPolymers2073-43602022-07-011414281810.3390/polym14142818Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide AerogelLiyao Xiong0Weijie Zheng1Shenglong Cao2Yuying Zheng3College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, ChinaCollege of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, ChinaCollege of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, ChinaCollege of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, ChinaAerogel materials are used in various fields, but there is a shortage of aerogel materials with an excellent combination of mechanical properties, thermal stability, and easy preparation. In this study, polyimide aerogel materials with superior mechanical properties, thermal stability, and low thermal conductivity were prepared by forming a double-gel system in the liquid phase. The amino-modified gel, prepared by coating SiO<sub>2</sub> nano-microspheres with GO through a modified sol-gel method (SiO<sub>2</sub>@GO-NH<sub>2</sub>), was subsequently homogeneously dispersed with PAA wet gel in water to form a double-gel system. The construction of a double-gel system enabled the PI aerogel to shape a unique honeycomb porous structure and a multi-layered interface of PI/SiO<sub>2</sub>/GO. The final obtained PI aerogel possessed effective thermal conductivity (0.0309 W/m·K) and a high specific modulus (46.19 m<sup>2</sup>/s<sup>2</sup>). In addition, the high thermal stability (543.80 °C in Ar atmosphere) and the ability to retain properties under heat treatment proved its durability in high thermal environments. The hydrophobicity (131.55°) proves its resistance to water from the environment. The excellent performance of this PI aerogel and its durability in thermal working environments make it possible to be applied in varied industrial and research fields, such as construction and energy, where heat and thermal insulation are required.https://www.mdpi.com/2073-4360/14/14/2818thermal insulationhydrophobicthermal stabilityaerogelpolyimide |
| spellingShingle | Liyao Xiong Weijie Zheng Shenglong Cao Yuying Zheng Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide Aerogel Polymers thermal insulation hydrophobic thermal stability aerogel polyimide |
| title | Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide Aerogel |
| title_full | Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide Aerogel |
| title_fullStr | Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide Aerogel |
| title_full_unstemmed | Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide Aerogel |
| title_short | Organic–Inorganic Double-Gel System Thermally Insulating and Hydrophobic Polyimide Aerogel |
| title_sort | organic inorganic double gel system thermally insulating and hydrophobic polyimide aerogel |
| topic | thermal insulation hydrophobic thermal stability aerogel polyimide |
| url | https://www.mdpi.com/2073-4360/14/14/2818 |
| work_keys_str_mv | AT liyaoxiong organicinorganicdoublegelsystemthermallyinsulatingandhydrophobicpolyimideaerogel AT weijiezheng organicinorganicdoublegelsystemthermallyinsulatingandhydrophobicpolyimideaerogel AT shenglongcao organicinorganicdoublegelsystemthermallyinsulatingandhydrophobicpolyimideaerogel AT yuyingzheng organicinorganicdoublegelsystemthermallyinsulatingandhydrophobicpolyimideaerogel |