【摘要】 以可反应性纳米SiO₂为填料,通过原位聚合法制备了聚酰胺6（PA6）/SiO₂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SiO₂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SiO₂的加入时间,探讨纳米SiO₂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SiO₂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SiO₂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。更多还原

【Abstract】 Polyamide 6/SiO₂ nanocomposite was prepared readily via in situ polymerization technology,where the reactive nano-SiO₂ was used as filler.Furthermore,as-obtained nanocomposite was characterized by means of transmission electron microscopy（TEM）,thermogravimetric analysis（TGA）,fourier-transform infrared spectroscopy（FT-IR）,differential scanning calorimetry（DSC）and X-ray diffraction（XRD）for analyzing the dispersion behavior of nano-SiO₂,the interfacial strength,thermal stability,crystallization and melting properties.The effect of interfacial structure between nanoSiO₂ and polyamide 6matrix on the properties of nanocomposite was studied by setting the addition time of nano-SiO₂ into the reaction system.The results showed that the reactive amino groups on the nano-SiO₂ could form chemical bonding with the molecular chains of polyamide 6,moreover,to for strengthening the interfacial effect.The heterogenenous nucleation effect of nano-SiO₂ was helpful to improve the crystallinity of polyamide 6,remarkably improved the mechanical properties of matrix,but led to a little effect to crystallization and melting behavior.更多还原