块体二氧化硅气凝胶的常压制备及性能研究

doi:10.11896/cldb.25010023

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Abstract The network skeletons of silica aerogels are primarily characterized by weak connections arranged in a pearl chain-like manner, exhibiting a low degree of cross-linking. This structural configuration contributes to their brittleness, poor mechanical properties and formability. In this study, we adopt a double cross-linking method using propylene oxide and gelatin to enhance the silica aerogel skeletons and regulate pore structures. A bulk silica aerogel with improved formability and thermal insulation properties was prepared under ambient pressure drying conditions. The work emphasizes the strengthening mechanism of the skeletons by propylene oxide and gelatin as well as the influence of gelatin content on the pore structures, sizes, etc. of the aerogels. Experimental results indicate that the synergistic effect of propylene oxide and gelatin fosters the formation of a more three-dimensional network skeleton, promoting the transformation of the weak neck connections between secondary particles into a uniform structure of closely stacked fine particles. Consequently, the connection strength of the skeleton is significantly enhanced. Furthermore, the addition of an appropriate amount of gelatin can inhibit the self-polymerization of propylene oxide after ring opening, resulting in more uniform and finer pores within the aerogel. The resulting aerogel demonstrates excellent mechanical and thermal insulation properties, with compressive stress increasing from 2 080.31 kPa to 2, 760.61 kPa, while thermal conductivity decreases from 0.084 50 W·m^-1·K^-1 to 0.038 63 W·m^-1·K^-1.

Key words： monolithic aerogel epoxypropane gelatin ambient pressure drying heat-insulating property

Published: 25 January 2026 Online: 2026-01-27

CLC number:

TQ427.2

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	Articles by authors
	PENG Huihui
	QIN Ling
	BAI Chaoyun
	KUANG Liang
	XIE Dan
	NIE Chaoyin

Cite this article:

PENG Huihui,QIN Ling,BAI Chaoyun, et al. Study on the Preparation and Performance of Bulk Silica Aerogel at Atmospheric Pressure[J]. Materials Reports, 2026, 40(2): 25010023-6.

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https://www.mater-rep.com/EN/10.11896/cldb.25010023 OR https://www.mater-rep.com/EN/Y2026/V40/I2/25010023

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