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以可反应性纳米SiO_2为填料,通过原位聚合法制备了聚酰胺6(PA6)/SiO_2纳米复合材料。利用透射电子显微镜(TEM)、热重分析仪(TG)、红外光谱分析仪(FT-IR)、差热扫描量热仪(DSC)和X-射线衍射仪研究了纳米SiO_2的分散行为、界面强度、热稳定性能和结晶熔融行为等。设定纳米SiO_2的加入时间,探讨纳米SiO_2与PA6基体间的界面结构对复合材料性能的影响。结果显示,纳米SiO_2表面的反应性氨基能够与PA6分子链作用,形成强的界面效应;纳米SiO_2的异相成核作用,提高了PA6的结晶度;显著提高了PA6的力学性能;对基体材料的结晶熔融行为的影响较小。
Polyamide 6 (PA6) / SiO 2 nanocomposites were prepared by in situ polymerization using reactive SiO 2 as filler. The dispersion behavior of nano-SiO 2 was investigated by transmission electron microscopy (TEM), thermogravimetric analysis (TG), infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and X-ray diffractometer Strength, thermal stability and crystal melting behavior. The adding time of nano-SiO2 was set up to investigate the influence of the interface structure between nano-SiO2 and PA6 matrix on the properties of the composites. The results show that the reactive amino groups on the surface of nano-SiO 2 can interact with the PA6 molecular chain to form a strong interfacial effect. The heterogeneous nucleation of nano-SiO 2 increases the crystallinity of PA 6 and enhances the mechanical properties of PA 6. The effect of the crystal melting behavior is small.