通过熔融共混将不同表面修饰的纳米SiO2与尼龙66在双螺杆挤出机上混合，制备出纳米SiO2／尼龙66复合材料。采用FTIR和XPS等测试手段分析了复合材料体系中不同表面修饰纳米SiO2与尼龙66的相互作用，并在此基础上对复合材料的热性能进行了研究。研究结果表明：不同的表面修饰处理得到不同的纳米SiO2／尼龙66界面相互作用，而界面相互作用的改变会对尼龙66的熔融和结晶行为产生影响：一方面使复合材料的结晶温度降低，晶粒尺寸减小，另一方面导致复合材料结晶度发生变化；TGA和DMA分析显示纳米SiO2表面修饰结构的不同还会对复合材料的热稳定性和玻璃化转变温度产生影响。
The PA66- based composites containing surface modified nano-SiO2 with different treatments were prepared in a twin-screw extruder by melt compounding. The interaction of different surface modified nano-SiO2 and PA66 in composites systems was studied by FTIR and XPS, and the thermal properties of composites were investigated. The results show that different surface modification treatments bring different interface interactions between nano-SiO2 and PA66, which can influence the melting and crystallization behavior of the PA66 matrix. The presence of modified nano-SiO2 can result in a lower crystallization temperature and smaller grain size of composites compared with pure PA66 and cause changes in crystallinity of nano-SiO2/PA66 composites. The TGA and DMA results indicate that surface modification structures of nano-SiO2 can produce effect on the thermal stability and glass transition temperature of nano-SiO2/PA66 composites.
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