先采用机械搅拌和超声分散方式在环氧树脂中分散纳米SiO2微粒,通过扫描电镜表征断面的形貌来分析纳米SiO2分散效果,再采用力学性能测试,研究纳米SiO2对环氧树脂及其玻璃纤维增强复合材料性能的影响,结果表明,超声分散效果明显优于机械搅拌分散;纳米SiO2含量对分散效果、环氧树脂及其复合材料力学性能具有显著影响;采用超声分散的1%（质量分数）纳米SiO2改性环氧树脂浇铸体的弯曲强度比未改性的提高了21.2%,其玻璃纤维增强复合材料的弯曲和拉伸强度分别提高了9.7%和7.9%,但层间剪切强度则降低了10.6%。
By mechanical stirring or ultrasonic dispersion method, the nano-SiO2 particles were dispersed in ep- oxy resin, and the effect of the nano-SiOz dispersion had been characterized through cross-section morphology of scanning electron microscopy. The mechanical properties of nano SiO2 particles modified epoxy resin and its glass reinforced composites were investigated. The results showed that the ultrasonic dispersion effect was obviously superior to the mechanical stirring; the nano-SiO2 content had a significant impact on the dispersion and mechanical properties of epoxy resin; compared with the unmodified epoxy resin, through ultrasonic dispersion, the bending strength incresed 21. 2% for casting body modified by 1wt% SiO2 and the flexural and tensile strength were increased by 9.7% and 7.9%, but the interlaminar shear strength was reduced by 10.6% for its glass fiber reinforced composites.
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