EP/纳米SiO2/空心微珠复合材的性能研究

选用微米级空心微珠和纳米SiO2作为填料，制备环氧树脂(EP)／纳米SiO2／空心微珠复合材料，研究空心微珠用量对复合材料的拉伸性能和冲击性能的影响，采用扫描电镜(SEM)研究复合材料的断裂模式，初步讨论了复合材料的隔热性能。结果表明，纳米SiO2和空心微珠的加入可以提高复合材料的拉伸强度和冲击强度，并且当空心微珠用量为10％、纳米SiO2用量为3％时，复合材料的各项力学性能最佳。随着空心微珠含量的继续增加，复合材料的拉伸强度和冲击强度均有不同程度的降低，拉伸弹性模量却有提高趋势。此外，空心微珠的加入使复合材料的脆性提高、韧性降低，隔热性能却有所改善。

STUDY ON PROPERTIES OF EPOXY/NANO-SiO2/HOLLOW MICRO-SPHERES COMPOSITES

Epoxy(EP)/nano-SiO_2/hollow-microsphere composites were prepared with micron hollow micro-sphere and nano-SiO_2 as fillers. The influence of hollow micro-sphere content on the tensile properties and impact properties of composites were studied, and the fracture model of composites was observed by SEM. Meanwhile, the heat-shielding performance of composites was discussed. The results showed that the addition of nano-SiO_2 and hollow micro-sphere could increase the tensile strength and impact strength. When the content of nano-SiO_2 was 3% and hollow micro-sphere was 10%, the mechanical properties of composites was optimal. When the content of hollow micro-sphere rose continuously, the tensile strength and impact strength of composites would decrease in some degree while modulus of elasticity in tension would increase slightly. Furthermore, the addition of hollow micro-sphere made brittleness increase and toughness decrease, but the heat shielding performance improved.