聚苯乙烯磺酸钠刷在水中的纳米摩擦
Nanofriction on Sodium Polystyrene Sulfonate Brushes in Water
摘要：
利用摩擦力显微镜（FFM）研究了聚苯乙烯磺酸钠（NaPSS）刷在水中的摩擦性能。采用接枝法在硅片上制备了聚电解质刷。与光滑硅晶片上的流体动力润滑相比，电刷显著降低了摩擦力和动摩擦动摩擦因数。摩擦力与滑动速度无关，但对于较低程度的NaPSS聚合而言，摩擦力较低。纳米压痕测试表明，刷中的聚合物链被强烈地拉伸远离基板。这些结果表明，聚合物链在水中点支撑FFM探针尖端，并减少接触面积和摩擦。
英文摘要：
We investigated the frictional properties of sodium polystyrene sulfonate (NaPSS) brushes in water by frictional force microscopy (FFM). Polyelectrolyte brushes were prepared on silicon wafers by the grafting-to method. The brushes considerably reduce the frictional force and coefficient of kinetic friction compared to hydrodynamic lubrication on a smooth Si wafer. Frictional force is independent of sliding speed, but is lower for lower degrees of NaPSS polymerization. Nanoindentation tests indicate that the polymer chains in a brush are stretched strongly away from the substrate. These results suggest that polymer chains point support the FFM probe tip in water and reduced contact area and friction.
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