Self-healing behavior of a polyelectrolyte-based lubricant additive for aqueous lubrication of oxide materials
Self-healing behavior of a polyelectrolyte-based lubricant additive for aqueous lubrication of oxide materials
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DOI：
10.1007/s11249-006-9121-9
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发表时间：
2006-12-01
影响因子：
3.2
通讯作者：
Spencer, N. D.
中科院分区：
文献类型：
--
作者：
Lee, S.;Mueller, M.;Spencer, N. D.
我们报道了一种基于聚电解质的水性润滑剂添加剂聚（l -赖氨酸）-接枝-聚乙二醇（PLL-g-PEG）在基于氧化物的摩擦系统的水润滑过程中的自修复行为。结合针盘摩擦测量和荧光显微镜实验表明，通过溶解在相邻体润滑剂中的聚合物快速修复磨损的摩擦对表面，实现了稳定的润滑性能。PLL-g- peg的这种快速“自我修复”归因于聚合物的聚阳离子聚赖氨酸（PLL）主链和带负电荷的氧化物表面之间的静电相互作用。相比之下，甲氧基聚（乙二醇）-三甲基硅油醚（Sil-PEG）这种润滑剂添加剂在摩擦学应力发生之前就与表面共价结合，却无法达到类似的愈合效果。
We report on the self-healing behavior of a polyelectrolyte-based aqueous lubricant additive, poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG), during aqueous lubrication of an oxide-based tribosystem. Combined pin-on-disk tribometry and fluorescence microscopy experiments have shown that stable lubricating performance was enabled by means of rapid healing of the worn tribopair surface by polymers dissolved in the adjoining bulk lubricant. This rapid 'self-healing' of PLL-g-PEG is attributed to electrostatic interactions between the polycationic poly(L-lysine) (PLL) backbone of the polymer and negatively charged oxide surface. In contrast, a similar healing effect was not readily achievable in the case of methoxy-poly(ethylene glycol)-trimethylsilylether (Sil-PEG), a lubricant additive that is covalently bonded to the surface prior to tribological stress.