Polysiloxane Bonded Silica Aerogel with Enhanced Thermal Insulation and Strength
| Autor: | Zongwei Tong, Dong Su, Ran Li, Huiming Ji, Weilin Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Vinyltriethoxysilane Materials science Silicon Composite number chemistry.chemical_element 02 engineering and technology engineering.material mechanical properties 010402 general chemistry 01 natural sciences Article Coating Thermal insulation Specific surface area organic–inorganic composite General Materials Science Composite material Microscopy QC120-168.85 business.industry QH201-278.5 coating Aerogel Engineering (General). Civil engineering (General) 021001 nanoscience & nanotechnology TK1-9971 0104 chemical sciences Compressive strength Descriptive and experimental mechanics chemistry polysiloxane engineering thermal insulation properties Electrical engineering. Electronics. Nuclear engineering TA1-2040 0210 nano-technology business silicon-based aerogel |
| Zdroj: | Materials Volume 14 Issue 8 Materials, Vol 14, Iss 2046, p 2046 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14082046 |
| Popis: | In order to improve the mechanical properties of SiO2 aerogels, PHMS/VTES-SiO2 composite aerogels (P/V-SiO2) were prepared. Using vinyltriethoxysilane (VTES) as a coupling agent, the PHMS/VTES complex was prepared by conducting an addition reaction with polyhydromethylsiloxane (PHMS) and VTES and then reacting it with inorganic silica sol to prepare the organic–inorganic composite aerogels. The PHMS/VTES complex forms a coating structure on the aerogel particles, enhancing the network structure of the composite aerogels. The composite aerogels can maintain the high specific surface area and excellent thermal insulation properties, and they have better mechanical properties. We studied the reaction mechanism during preparation and discussed the effects of the organic components on the structure and properties of the composite aerogels. The composite aerogels we prepared have a thermal conductivity of 0.03773 W·m−1·K−1 at room temperature and a compressive strength of 1.87 MPa. The compressive strength is several times greater than that of inorganic SiO2 aerogels. The organic–inorganic composite aerogels have excellent comprehensive properties, which helps to expand the application fields of silicon-based aerogels. |
| Databáze: | OpenAIRE |
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