不饱和聚酯/蒙脱土纳米复合材料的制备及其摩擦磨损性能研究

Friction and Wear Behavior of Unsaturated Polyester/Montmorillonite Intercalated Nanocomposites

采用插层法制备了不饱和聚酯/蒙脱土纳米复合材料,用X射线衍射仪表征了复合材料的插层型结构,考察了蒙脱土含量对复合材料耐磨性能的影响,并用扫描电子显微镜及能谱分析仪观察分析了复合材料磨损表面.结果表明:所制备的插层型纳米复合材料的耐磨性能显著优于不饱和聚酯;随着蒙脱土含量增加复合材料的耐磨性能明显提高,随后趋于稳定;不饱和聚酯同45#钢对摩时主要发生粘着磨损和疲劳剥落,而含蒙脱土的复合材料的粘着磨损和疲劳剥落显著减轻.

Nanocomposites of unsaturated polyester (UP) filled with montmorillonite (MMT) were prepared by intercalation polymerization. The phase structures of the resulting nanocomposites were characterized by means of X-ray diffraction. The friction and wear behavior of the nanocomposites in sliding against AISI-1045 steel under the water-lubricated condition was examined on an MM-200 test rig in a ring-on-block configuration. The worn surfaces of the nanocomposites were examined by means of scanning electron microscopy and energy dispersive spectrometry. As a result, the nanocomposites showed much better wear resistance than the UP matrix, while the friction-reducing ability rose slightly. This was related to the change in the wear mechanism induced by the introduction of the MMT as the filler. In other words, UP was dominated by the adhesion wear and fatigue peeling off in water-lubricated sliding against the steel, while the adhesion wear and fatigue peeling off were considerably abated for the nanocomposite under the same test condition.