Synthesis of high-temperature resistance hybrid silicon resin and evaluation of its composite material's high-temperature mechanical property

Hybrid SiO₂/Silicon resin was synthesized via a sol-gel route by using CH₃Si(OCH₃)₃ and Si(OC₂H₅)₄ as primary materials and CH₃OH as the solvent. The prepared hybrid SiO₂/Silicon resin was characterized by Fourier transform infrared spectra (FT-IR). The thermal properties and thermal degradation mechanism were investigated by thermo-gravimetric analysis(TG). Quartz fiber reinforced methyl silicon resin and TEOS-modified methyl silicon resin composites were prepared. The results show that flexural strength of TEOS-modified methyl silicon resin/quartz fiber can be improved with the addition of TEOS, especially the flexural strength of composites under high temperature. The morphologies of flexural fracture of composite with different ratio of TEOS were observed by scanning electron microscopy (SEM), and SEM microscopic studies show that the presence of TEOS in methylsilicone resin, to a large extent, improves interfacial strength between methyl silicon resin and quartz fiber under high temperature.