Three TMCS Hydrophobic Modification Methods of New Building Insulation Material SiO₂ Aerogels

Abstract:

Trimethylchlorosilane as a modifier and tetraethoxysilane, an acid catalyst, as raw material were modified hydrophobically through the copolymerization, surface derivative, and hierarchical hydrophobic modification methods. The modified material was prepared as hydrophobic SiO₂ aerogels by constant pressure drying. Finally, thermal stability, pore structure, and chemical composition of SiO₂ aerogels were analyzed using TG-DSC, FTIR, and BET. The results show that the hydrophobic property of SiO₂ aerogels prepared using hierarchical hydrophobic modification and surface derivative methods have excelled characteristics, such as super-hydrophobicity. The aerogels prepared through the two different methods have a mesopore structure with mesopores of 2–70 nm; however, they have no micropore structure.

• Periodical: Advanced Materials Research (Volumes 163-167)
• Pages: 770-777
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.163-167.770
• Online since: December 2010
• Authors: Wen Zhi Zheng, Wei Guo Ding, Bo Ju Ouyang, Hai Jian Chen, Zhen Yue Chi
• Keywords: Constant Pressure Drying, Hydrophobic Modification, Pore Structure, SiO₂ Aerogel, Thermal Stability

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