文献类型：期刊文献

英文题名：A robust silicone aerogel via copolymerization of a difunctional organoalkoxysilane and polymethylmethoxysiloxane for high-temperature thermal insulation

作者：Luo, Yi[1];Yan, Aoqing[1];Tian, Hao[1];Niu, Bo[1,2];Zhang, Yayun[1,2];Wang, Hualin[1];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China

年份：2024

卷号：12

期号：8

起止页码：4684

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20240515476164);WOS:【SCI-EXPANDED(收录号:WOS:001154845700001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (no. 22078100, no. 52102098) and the Fundamental Research Funds for the Central Universities (no. 222201718002).

语种：英文

外文关键词：Atmospheric temperature - Compressive strength - Costs - Porous materials - Silicones - Sol-gel process - Thermal conductivity - Thermal insulation - Thermodynamic stability

摘要：Aerogels are porous materials that show immense potential in thermal insulation, but achieving low-cost preparation of aerogels with both high strength and high thermal stability remains a challenge. Herein we report robust silicone aerogels for high-temperature thermal insulation, which are prepared by a facile sol-gel process followed by low-cost ambient pressure drying. The key to the preparation lies in the utilization of long-chain polymethylmethoxysiloxane as the framework and a difunctional organoalkoxysilane as the crosslinker, leading to the formation of a 3D crosslinked Si-O-Si network. Long-chain polymethylmethoxysiloxane can promote the formation of a robust gel skeleton by enhancing the binding between gel particles, while the difunctional organoalkoxysilane can adjust the microstructure and mechanical properties of the gel by modulating the crosslinking degree. The resultant aerogels exhibit low densities of ca. 0.3 g cm(-3), low room-temperature thermal conductivities of ca. 0.03 W m(-1) K-1, and superior compressive strength up to 3.7 MPa. Furthermore, they demonstrate exceptional thermal stability with over 70% residual mass in both air and nitrogen atmospheres at 800 degrees C. Remarkably, these silicone aerogels show great potential as high-temperature thermal insulation materials, in which a 20 mm-thick aerogel plate can withstand a 1000 degrees C flame for 500 s with a backside temperature of only 60 degrees C.