Preparation and friction force microscopy measurements of immiscible, opposing polymer brushes.
Preparation and friction force microscopy measurements of immiscible, opposing polymer brushes.
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DOI：
10.3791/52285
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发表时间：
2014-12-24
期刊：
影响因子：
--
通讯作者：
Vancso GJ
中科院分区：
文献类型：
--
作者：
de Beer S;Kutnyanszky E;Müser MH;Vancso GJ
众所周知，溶剂化聚合物刷可以润滑高压触点，因为它们可以在保持界面低摩擦的同时维持正的正常负载。然而，由于相对刷的交错，这些系统可能对磨损很敏感。在最近发表的一篇文章中，我们通过分子动力学模拟和原子力显微镜实验表明，使用不混相聚合物刷系统分别终止基板和滑块表面，可以消除这种交叉现象。因此，减少了触点的磨损。此外，与传统的混相聚合物刷系统相比，摩擦力降低了两个数量级。因此，这种新提出的系统在工业上具有很大的应用潜力。本文介绍了一种由两种不同的刷体组成的不混相聚合物刷体体系的构建方法。描述了从平面上接枝聚n -异丙基丙烯酰胺（PNIPAM）和从原子力显微镜（AFM）胶体探针上接枝聚甲基丙烯酸甲酯（PMMA）的过程。PNIPAM溶于水，PMMA溶于苯乙酮。通过摩擦力AFM测试表明，该体系的摩擦力确实比PMMA与苯乙酮溶剂化PMMA的混相体系降低了两个数量级。
Solvated polymer brushes are well known to lubricate high-pressure contacts, because they can sustain a positive normal load while maintaining low friction at the interface. Nevertheless, these systems can be sensitive to wear due to interdigitation of the opposing brushes. In a recent publication, we have shown via molecular dynamics simulations and atomic force microscopy experiments, that using an immiscible polymer brush system terminating the substrate and the slider surfaces, respectively, can eliminate such interdigitation. As a consequence, wear in the contacts is reduced. Moreover, the friction force is two orders of magnitude lower compared to traditional miscible polymer brush systems. This newly proposed system therefore holds great potential for application in industry. Here, the methodology to construct an immiscible polymer brush system of two different brushes each solvated by their own preferred solvent is presented. The procedure how to graft poly(N-isopropylacrylamide) (PNIPAM) from a flat surface and poly(methyl methacrylate) (PMMA) from an atomic force microscopy (AFM) colloidal probe is described. PNIPAM is solvated in water and PMMA in acetophenone. Via friction force AFM measurements, it is shown that the friction for this system is indeed reduced by two orders of magnitude compared to the miscible system of PMMA on PMMA solvated in acetophenone.
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