利用溶胶-凝胶法制备了SiO2/环氧树脂基复合材料,研究了材料的室温与低温(77 K)下的力学性能.结果表明,适量SiO2的引入提高了室温与低温下材料的拉伸强度、断裂伸长率和冲击强度,即SiO2含量在2%时可同时起到增强、增韧作用.采用扫描电镜(SEM)和透射电镜(TEM)分别对复合材料的断口形貌和高温焚烧后残留物纳米颗粒进行了观察.还利用动态力学分析(DMA)研究了二氧化硅的引入对复合材料的影响.
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