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    • 6. 发明授权
    • Lubrication with oil-compatible polymer brushes
    • 润滑与油相容的聚合物刷
    • US09441177B2
    • 2016-09-13
    • US14113448
    • 2012-04-03
    • Robert M. BieleckiEdmondo M. BenettiNicholas D. Spencer
    • Robert M. BieleckiEdmondo M. BenettiNicholas D. Spencer
    • C10M107/28C09D133/08C10M177/00
    • C10M107/28C09D133/08C10M177/00C10M2203/0206C10M2203/065C10M2207/0406C10M2207/2805C10M2207/401C10M2209/0845C10N2250/121C10N2270/00
    • A polymer-brush-based, surface-modification strategy for friction and wear reduction in hard contact under boundary-lubrication conditions is proposed, specifically for a non-aqueous environment. Surface-initiated Atom Transfer Radical Polymerization (SI-ATRP) was employed for the synthesis of three different oil-compatible, hydrophobic polymer brushes based on alkyl methacrylates. This study presents polymerization kinetics, chemical characterization by means of Fourier transform infrared spectroscopy (FTIR) and surface morphologies observed in atomic force microscopy (AFM). The lubrication properties of the anchored polymers were evaluated macroscopically by means of ball-on-disk methods and on the nanonewton scale by lateral force microscopy (AFM/LFM) and showed significant reduction in friction up to contact pressures as high as 460 MPa. The frictional response of surface-grafted polymers is shown to depend strongly on the compatibility of the polymer with the chosen lubricating fluid. Their good tribological performances have also been proven with watchmaking lubricants. These results do make the prevent invention a suitable candidate for a watchmaking application (such as at the balance pivot or the escapement) in order to increase the efficiency and reliability of the movements.
    • 提出了一种基于聚合物刷的表面改性策略,用于在边界润滑条件下硬接触的摩擦和磨损降低,特别适用于非水环境。 表面引发的原子转移自由基聚合(SI-ATRP)用于合成基于甲基丙烯酸烷基酯的三种不同的油相容性疏水性聚合物刷。 本研究通过傅立叶变换红外光谱(FTIR)和原子力显微镜(AFM)观察到的表面形态,提出了聚合动力学,化学特征。 锚定聚合物的润滑性能通过球盘法和纳米级尺度横向力显微镜(AFM / LFM)进行宏观评估,并显示高达460MPa的接触压力下的摩擦力显着降低。 显示表面接枝聚合物的摩擦响应强烈依赖于聚合物与所选择的润滑流体的相容性。 他们的良好的摩擦学性能也被制表润滑剂证明。 这些结果确实使得防止发明成为制表应用(例如平衡枢轴或擒纵机构)的合适候选者,以便提高运动的效率和可靠性。