Journal of Inorganic Materials ›› 2022, Vol. 37 ›› Issue (12): 1281-1288.DOI: 10.15541/jim20220129

Special Issue: 【结构材料】隔热材料

• RESEARCH ARTICLE • Previous Articles     Next Articles

Preparation and High Temperature Inorganic Transformation of Flexible Silicone Aerogels

LUO Yi1(), XIA Shuhai2, NIU Bo2, ZHANG Yayun2, LONG Donghui2()   

  1. 1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
    2. School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2022-03-08 Revised:2022-05-06 Published:2022-12-20 Online:2022-05-27
  • Contact: LONG Donghui, professor. E-mail:
  • About author:LUO Yi (1993-), male, PhD candidate. E-mail:


Silica aerogels have wide application prospect in high temperature heat insulation due to their low density and high porosity. However, the brittleness and high cost of supercritical drying restrict their application. In this study, spongy silicone aerogels with high flexibility were prepared via Sol-Gel polymerization and atmospheric pressure drying using vinyltrimethoxysilane (VTMS) and vinylmethyldimethoxysilane (VMDMS) as precursors. The effects of precursor molar ratio on the microstructure and compressive resilience of aerogels, as well as the inorganic transformation process of aerogels in high temperature aerobic and anaerobic environments were studied. The results show that with the increase of VTMS/VMDMS ratio in the precursor, the aerogel particles become smaller and more tightly packed, and the compression resilience of aerogels also decreased. In air at 800 ℃, aerogels were transformed into inorganic SiO2 by oxidation of organic side groups, fracture and rearrangement of main chain Si-O-Si. In N2 at 800 ℃, aerogels were transformed into the mixture of inorganic SiO2 and free carbon by pyrolysis reaction, and after further treatment at 1000-1400 ℃, SiO2 and free carbon were subjected to carbothermal reduction reaction to form amorphous Si-O-C structures such as SiO4, SiCO3, SiC2O2, and SiC3O, and a small amount of β-SiC nanowires. The Si-O-C structure formed by carbothermal reduction reaction at 1200 ℃ has optimal high temperature oxidation resistance, which can provide reference for the preparation of pyro-oxidation resistant Si-O-C aerogels.

Key words: silicone aerogel, flexibility, heat insulation, high-temperature oxidation, pyrolysis

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