其冲击断口微观形貌由室温时的韧窝断口逐渐变为低温下的塑性沿晶断口。
The fracture appearance is dimple at room temperature, it changes into intercrystalline fracture at low-temperature.
运用扫描电镜（SEM）和偏光显微镜对共混物的冲击断口形貌以及结晶情况进行了观察与分析；
The morphology and the crystallinity of the blends were studied with SEM and polarizing microscope respectively.
冲击断口的SEM照片显示，纳米二氧化硅和纳米碳酸钙诱发银纹的能力显著，是增强增韧环氧树脂的主要原因。
SEM impact fracture showed that powerful microcrack induction ability of nano SiO2 and nano CaCO3 was the main reason of enhancement and toughness for epoxy resin.
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