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固体表面间的润滑剂处于不同于体相液体的特殊约束状态．现以球型分子液体为模型对薄膜约束状态下润滑剂的性质进行分子动力学模拟结果表明，随着膜厚减薄，薄膜中液体等效粘度增加，固一液相变的临界压力减小，说明在纳米级薄膜中润滑剂可能在很低的压力下发生相变，从而表现出固体或类固体的性态在剪切响应方面，薄膜中润滑剂分子的松弛时间增加，在较低的剪切率下即出现剪切变稀现象，呈现明显的非牛顿性和粘弹性
The lubricant between the solid surfaces is in a special restraint state different from that of the bulk liquid. Molecular dynamics simulation of the properties of the lubricant in the film-constrained state is carried out using the spherical molecular liquid model. The results show that with the decrease of the film thickness, the equivalent viscosity of the liquid increases and the critical pressure of the solid-liquid phase decreases , Indicating that in nanoscale films, the lubricant may undergo phase transformation at very low pressure to exhibit solid or solid-like behavior. In terms of shear response, the relaxation time of lubricant molecules in the film increases, and at lower Shear rate that shear thinning phenomenon, showing a clear non-Newtonian and viscoelastic