Juwono Ariadne, Edward Graham
School of Physics and Materials Engineering, Monash University, Clayton, Victoria 3168, Australia.
J Nanosci Nanotechnol. 2006 Dec;6(12):3943-6. doi: 10.1166/jnn.2006.655.
This work investigates the fatigue behaviour and the mechanism of fatigue failure of an epoxy resin with a dispersion of modified layered silicates in the polymer matrix. The fatigue properties are very important for structural application of nanocomposite materials. Clay-epoxy nanocomposites were successfully synthesized with a commercially available 1-Methylimidazole curing agent. The XRD and TEM findings demonstrated a pattern of clay morphology typically found in nanocomposite systems. The fatigue performance and fatigue failure mechanism of the clay-epoxy materials were studied under repetitive bending loads. The results showed that the fatigue life of filled epoxy improved significantly at strain amplitudes below a threshold value. The E-SEM observations of the epoxy and the clay-epoxy fracture surfaces showed different patterns. In conclusion, the addition of silicate strongly determines the fracture mechanism and enhances the fatigue performance.
本研究调查了一种在聚合物基体中分散有改性层状硅酸盐的环氧树脂的疲劳行为及疲劳失效机制。疲劳性能对于纳米复合材料的结构应用非常重要。使用市售的1-甲基咪唑固化剂成功合成了粘土-环氧树脂纳米复合材料。X射线衍射（XRD）和透射电子显微镜（TEM）的研究结果显示出纳米复合材料体系中典型的粘土形态模式。在反复弯曲载荷下研究了粘土-环氧树脂材料的疲劳性能和疲劳失效机制。结果表明，在应变幅值低于阈值时，填充环氧树脂的疲劳寿命显著提高。环氧树脂和粘土-环氧树脂断裂表面的环境扫描电子显微镜（E-SEM）观察显示出不同的模式。总之，硅酸盐的添加强烈地决定了断裂机制并提高了疲劳性能。
