Hydrophobic Cellulose Acetate Aerogels for Thermal Insulation
As naturally derived material, cellulose aerogels have excellent thermal insulation properties due to their unique high porosity and three-dimensional mesoporous structure. However, its hydrophilic properties limit its application in the field of building insulation. Here, we propose a method to pre...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Gels |
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| Online Access: | https://www.mdpi.com/2310-2861/8/10/671 |
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| author | Sizhao Zhang Zhouyuan Yang Xing Huang Jing Wang Yunyun Xiao Junpeng He Jian Feng Shixian Xiong Zhengquan Li |
| author_facet | Sizhao Zhang Zhouyuan Yang Xing Huang Jing Wang Yunyun Xiao Junpeng He Jian Feng Shixian Xiong Zhengquan Li |
| author_sort | Sizhao Zhang |
| collection | DOAJ |
| description | As naturally derived material, cellulose aerogels have excellent thermal insulation properties due to their unique high porosity and three-dimensional mesoporous structure. However, its hydrophilic properties limit its application in the field of building insulation. Here, we propose a method to prepare high hydrophobicity by adopting the sol-gel method and chemical vapor reaction strategy using cellulose acetate type II as raw material and 2,4-toluene diisocyanate as the cross-linking agent. Thermal properties of cellulose acetate aerogels (CAAs) were measured, where pyridine was the catalyst, acetone was the solvent, and perfluorodecyltriethoxysilane (PFDS), hexamethyldisilazane (HMDS), and methyltriethoxysilane (MTES) were used as hydrophobic agents (by process hydrophobic test). Compared with MTES-modified cellulose acetate aerogels (M-CAAs) and HMDS (H-CAAs)-modified cellulose acetate aerogels, PFDS-modified (P-CAAs) cellulose acetate aerogels are the most hydrophobic. By implementing hydrophobic modification of PFDS both inside and outside the structure of cellulose acetate aerogels, the water contact angle can reach up to 136°, strongly demonstrating the potential of PFDS as a hydrophobic agent. The results show that the thermal conductivity and compressive strength of cellulose acetate aerogel with the best hydrophobic properties are 0.035 W m<sup>−1</sup> K<sup>−1</sup> at normal pressure and 0.39 MPa at 3% strain, respectively. This work shows that the highly hydrophobic cellulose acetate aerogel has potential as a waterproof material in the field of building thermal-insulation materials. |
| first_indexed | 2024-03-09T20:11:42Z |
| format | Article |
| id | doaj.art-79a77f235ec04d58bc528f9d4b3617ec |
| institution | Directory Open Access Journal |
| issn | 2310-2861 |
| language | English |
| last_indexed | 2024-03-09T20:11:42Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Gels |
| spelling | doaj.art-79a77f235ec04d58bc528f9d4b3617ec2023-11-24T00:14:02ZengMDPI AGGels2310-28612022-10-0181067110.3390/gels8100671Hydrophobic Cellulose Acetate Aerogels for Thermal InsulationSizhao Zhang0Zhouyuan Yang1Xing Huang2Jing Wang3Yunyun Xiao4Junpeng He5Jian Feng6Shixian Xiong7Zhengquan Li8Polymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, ChinaPolymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, ChinaScience and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, ChinaPolymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, ChinaPolymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, ChinaPolymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, ChinaScience and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, ChinaPolymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, ChinaPolymer Aerogels Research Center, Jiangxi University of Science and Technology, Nanchang 330013, ChinaAs naturally derived material, cellulose aerogels have excellent thermal insulation properties due to their unique high porosity and three-dimensional mesoporous structure. However, its hydrophilic properties limit its application in the field of building insulation. Here, we propose a method to prepare high hydrophobicity by adopting the sol-gel method and chemical vapor reaction strategy using cellulose acetate type II as raw material and 2,4-toluene diisocyanate as the cross-linking agent. Thermal properties of cellulose acetate aerogels (CAAs) were measured, where pyridine was the catalyst, acetone was the solvent, and perfluorodecyltriethoxysilane (PFDS), hexamethyldisilazane (HMDS), and methyltriethoxysilane (MTES) were used as hydrophobic agents (by process hydrophobic test). Compared with MTES-modified cellulose acetate aerogels (M-CAAs) and HMDS (H-CAAs)-modified cellulose acetate aerogels, PFDS-modified (P-CAAs) cellulose acetate aerogels are the most hydrophobic. By implementing hydrophobic modification of PFDS both inside and outside the structure of cellulose acetate aerogels, the water contact angle can reach up to 136°, strongly demonstrating the potential of PFDS as a hydrophobic agent. The results show that the thermal conductivity and compressive strength of cellulose acetate aerogel with the best hydrophobic properties are 0.035 W m<sup>−1</sup> K<sup>−1</sup> at normal pressure and 0.39 MPa at 3% strain, respectively. This work shows that the highly hydrophobic cellulose acetate aerogel has potential as a waterproof material in the field of building thermal-insulation materials.https://www.mdpi.com/2310-2861/8/10/671cellulose acetate aerogelhydrophobic treatmentwater contact angleperfluorodecyltriethoxysilane |
| spellingShingle | Sizhao Zhang Zhouyuan Yang Xing Huang Jing Wang Yunyun Xiao Junpeng He Jian Feng Shixian Xiong Zhengquan Li Hydrophobic Cellulose Acetate Aerogels for Thermal Insulation Gels cellulose acetate aerogel hydrophobic treatment water contact angle perfluorodecyltriethoxysilane |
| title | Hydrophobic Cellulose Acetate Aerogels for Thermal Insulation |
| title_full | Hydrophobic Cellulose Acetate Aerogels for Thermal Insulation |
| title_fullStr | Hydrophobic Cellulose Acetate Aerogels for Thermal Insulation |
| title_full_unstemmed | Hydrophobic Cellulose Acetate Aerogels for Thermal Insulation |
| title_short | Hydrophobic Cellulose Acetate Aerogels for Thermal Insulation |
| title_sort | hydrophobic cellulose acetate aerogels for thermal insulation |
| topic | cellulose acetate aerogel hydrophobic treatment water contact angle perfluorodecyltriethoxysilane |
| url | https://www.mdpi.com/2310-2861/8/10/671 |
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