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

• Published in: Applied surface science Vol. 437; pp. 321 - 328
• Main Authors: Zhou, Ting, Cheng, Xudong, Pan, Yuelei, Li, Congcong, Gong, Lunlun, Zhang, Heping
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2018
• Subjects: Co-precursor; Freeze drying; GF/aerogel composites; Mechanical properties; Thermal stability; Mechanical properties; Freeze drying; Co-precursor; GF/aerogel composites; Thermal stability
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.12.146

[Display omitted] •Glass-fiber reinforced aerogels showed remarkable mechanical strength and flexibility compared with pure aerogel powders.•The hybrid aerogel showed superhydrophobicity, great thermal stability and low thermal conductivity.•The MTMS/water glass hybrid aerogels were prepared via freeze drying without further surface modification.•The molar ratio of MTMS/water glass could significantly influence the properties of composite. 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.