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采用偶联剂SEA-171对纳米SiO2表面进行了处理(M-1),再由偶氮异丁腈对M-1进行锚固表面处理(M-2),对产物进行了红外,元素分析和热失重分析。研究了上述2种纳米SiO2的含量对其氰酸酯树脂复合材料静态力学性能的影响,并采用扫描电镜和透射电镜分析研究了材料界面结构特征,探讨了其作用机理。结果表明,当M-1的添加质量分数为3%时,复合材料的冲击强度增长61.9%;弯曲强度增长44.2%,添加4%M-2时,增幅分别为89.0%和53.8%。经锚固处理后,纳米SiO2颗粒团聚程度减小,在高分子有机相中的分散更加均匀。
The surface of nanosilica was treated with silane coupling agent SEA-171 (M-1), M-1 was anchored by azoisobutyronitrile (M-2), and the products were analyzed by IR and elemental analysis Thermogravimetric analysis. The effects of the above two kinds of nano-SiO2 content on the static mechanical properties of the cyanate ester resin composites were studied. The interfacial features of the materials were analyzed by scanning electron microscopy and transmission electron microscopy, and the mechanism of action was also discussed. The results showed that the impact strength of composites increased by 61.9% and the flexural strength increased by 44.2% and 3%, respectively. The additions of 4% M-2 increased by 89.0% and 53.8%, respectively. After the anchoring treatment, the degree of aggregation of the nano-SiO2 particles is reduced, and the dispersion in the polymer organic phase is more uniform.