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Mechanical performance and thermal stability of glass fiber reinforced silica aerogel composites based on co-precursor method by freeze drying

In order to maintain the integrity, glass fiber (GF) reinforced silica aerogel composites were synthesized using methltrimethoxysilane (MTMS) and water glass co-precursor by freeze drying method. The composites were characterized by scanning electron microscopy, Brunauer-Emmett-Teller analysis, uniaxial compressive test, three-point bending test, thermal conductivity analysis, contact angle test, TG-DSC analysis. It was found that the molar ratio of MTMS/water glass could significantly affect the properties of composites. The bulk density and thermal conductivity first decreased and then increased with the increasing molar ratio. The composites showed remarkable mechanical strength and flexibility compared with pure silica aerogel. Moreover, when the molar ratio is 1.8, the composites showed high specific surface area (870.9?m2/g), high contact angle (150°), great thermal stability (560?°C) and low thermal conductivity (0.0248?W/m·K). These outstanding properties indicate that GF/aerogels have broad prospects in the field of thermal insulation.

» Author: Ting Zhou, Xudong Cheng, Yuelei Pan, Congcong Li, Lunlun Gong, Heping Zhang

» Reference: Applied Surface Science, Volume 437

» Publication Date: 15/04/2018

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609203].

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