Hybrid aerogels with an ultralight nonparticulate reticulated structure and a method of producing the same
A network structure, aerogel technology, applied in aerogel preparation, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as increasing total thermal conductivity and increasing aerogel density
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Embodiment 1
[0091] Example 1: PE-based silica airgel
[0092] This example describes: (i) the synthesis method of a PE-based non-particulate silica airgel precursor with high molecular weight, (ii) the airgel fabrication process, and (iii) the resulting hybrid aircondensation properties of glue. All chemicals were purchased from Sigma-Aldrich.
[0093] An amount of 5.97 g of di-tert-butyl peroxide was added to 60 g of liquid vinyltrimethoxysilane, followed by vigorous stirring at 163° C. for 2 hours under nitrogen. The degree of polymerization under these processing conditions was 130. However, by varying the thermal initiator or processing conditions, different molecular weights can be obtained. for CO 2 To obtain the desired final airgel density after supercritical extraction, a specific amount of polymer precursor and catalyst must be added to a specific amount of solvent (e.g. ethanol). For example, 4 g of the polymer precursor is added to 20 ml of ethanol, and then 5.4 g of ammo...
Embodiment 2
[0094] Example 2: The cost of thermal initiator species using PE-based silica aerogels is significant
[0095] reduce
[0096] This example describes how the synthesis cost of the PE-based silica airgel shown in Example 1 can be significantly reduced by using different thermal initiators with negligible sacrifices for mechanical and thermal properties .
[0097] We added 5.97 g of dicumyl peroxide (instead of di-tert-butyl peroxide) as a thermal initiator to 60 g of vinyltrimethoxysilane, followed by vigorous stirring at 123° C. for 1 hour under nitrogen. The degree of polymerization under this processing condition was 67. for CO 2 To obtain the desired final airgel density after supercritical extraction, a certain amount of polymer precursor and catalyst must be added to a specific solvent such as ethanol. For example, 1.6 g of this polymer precursor was dissolved in 20 ml of ethanol, and then 1.9 g of ammonia were added to the solution at 40°C. After the drying stage, the...
Embodiment 3
[0098] Example 3: Polyether-based silica airgel
[0099] This example describes the synthesis of polyether-based silica airgel precursors and the corresponding hybrid airgel fabrication process.
[0100] To prepare polyether-based silica airgel precursors, (3-glycidyloxypropyl)trimethoxysilane (GPTMS), diethyl etherate boron trifluoride and diethyl ether were used as monomers, respectively, catalysts and solvents. The polymer structure of GPTMS was synthesized by cationic ring-opening polymerization. An amount of 60 g of GPTMS was dissolved in 40 ml of ether and cooled to 0° C. with an ice bath under nitrogen. Then, 0.4 ml of the catalyst was added dropwise to the solution, followed by vigorous stirring for 2 hours. The final mixture was placed under vacuum to remove ether. According to GPC data, the degree of polymerization under this condition was 29. 2 g of the polymer precursor were added to 20 ml of ethanol, then 1.6 g of ammonia were added to the above mixture at 40...
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