Um Jun Geun, Jun Yun-Seok, Alhumade Hesham, Krithivasan Hariharan, Lui Gregory, Yu Aiping
Department of Chemical Engineering, University of Waterloo 200 University Avenue West Waterloo Ontario Canada N2L 3G1
RSC Adv. 2018 May 9;8(31):17091-17100. doi: 10.1039/c8ra02087f.
In this article, polyurethane/graphene nano-platelet (PU/GnP) composites were fabricated planetary centrifugal mixer (PCM) and cast on polyethylene terephthalate (PET) and copper substrates. Four different grades of GnP are used to investigate the effect of GnP size on the anti-corrosion performance of the composites. Tafel, Nyquist, and Bode plots are used to quantify and compare the anti-corrosion performance of the composites, and these plots are obtained by electrochemical analysis. In addition to the anti-corrosion performance, mechanical properties and morphologies of the composites are analyzed. Various parameters indicating the anti-corrosion performance illustrate that smaller size of GnP in the composites shows higher anti-corrosion performance on copper substrate. The results show that the smaller size of GnP is not only uniformly dispersed within PU, but also offers a high surface area which helps construct an efficient filler pathway that suppresses the diffusion of a corrosive agent into the polymer matrix. Nevertheless, mechanical properties of the composites are partially improved. Essentially, this study demonstrates that the size of GnP plays a central role in determining the anti-corrosion performance of PU/GnP composites.
在本文中，采用行星式离心混合器（PCM）制备了聚氨酯/石墨烯纳米片（PU/GnP）复合材料，并将其浇铸在聚对苯二甲酸乙二酯（PET）和铜基底上。使用四种不同等级的GnP来研究GnP尺寸对复合材料耐腐蚀性能的影响。通过电化学分析获得塔菲尔曲线、奈奎斯特曲线和伯德图，用于量化和比较复合材料的耐腐蚀性能。除了耐腐蚀性能外，还对复合材料的力学性能和形态进行了分析。各种表明耐腐蚀性能的参数表明，复合材料中较小尺寸的GnP在铜基底上表现出更高的耐腐蚀性能。结果表明，较小尺寸的GnP不仅均匀地分散在PU中，而且提供了高表面积，有助于构建有效的填料通道，抑制腐蚀剂扩散到聚合物基体中。然而，复合材料的力学性能得到了部分改善。本质上，本研究表明GnP的尺寸在决定PU/GnP复合材料的耐腐蚀性能方面起着核心作用。
