State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics , Chinese Academy of Sciences , 73000 Lanzhou , China.
University of Chinese Academy of Sciences , Beijing 100049 , China.
ACS Appl Mater Interfaces. 2018 Dec 5;10(48):41699-41706. doi: 10.1021/acsami.8b15198. Epub 2018 Nov 20.
Despite recent advances in the stimuli-responsive composites for oil storage and smart lubrication, achieving the high oil storage and recyclable smart-lubrication remains a challenge. Herein, a novel cobweb-like structural system consisting of oil warehouse and transportation system was designed and prepared and it shows high capacity of oil storage and recyclable smart-lubrication. Hollow SiO microspheres grated of KH550 and porous polyimide (PPI) were used as oil warehouse and pipeline, respectively, to build the smart system. Because of the novel structure, the composites can keep both high oil-content and oil-retention. Applying stimuli on materials resulted in lubricants releasing on the contact surface which can reduce the friction and wear during sliding. However, removing stimuli, the capillary force induced the sucking back of lubricant into the interior of composites through interconnected small pores of PPI. On the basis of high oil storage and stimuli-responsive performance, the composites can be used for recyclable smart-lubrication. The composites showed remarkable lubricating properties (coefficient of friction 0.056 and Ws 3.55 × 10 mm N m) when the content of KHSM (hollow silica microspheres grated of KH550 (3-Aminopropyltriethoxysilane)) was 1.5 wt % by subjecting it to macroscopic pin-on-disc friction tests. Therefore, cobweb-like structural composites with oil warehouse and transportation system hold the promise for formulating of high oil storage and recyclable smart-lubrication.
尽管在用于储油和智能润滑的刺激响应复合材料方面取得了最新进展，但实现高储油量和可回收的智能润滑仍然是一个挑战。在此，设计并制备了一种由储油仓库和运输系统组成的新型蛛网结构体系，它表现出高储油量和可回收的智能润滑性能。空心 SiO2 微球经 KH550 接枝和多孔聚酰亚胺（PPI）分别用作油仓库和管道，以构建智能系统。由于这种新颖的结构，复合材料可以保持高含油率和油保留率。对材料施加刺激会导致润滑剂在接触表面释放，从而减少滑动过程中的摩擦和磨损。然而，去除刺激后，毛细力会通过 PPI 的互连小孔将润滑剂吸入复合材料的内部。基于高储油和刺激响应性能，该复合材料可用于可回收的智能润滑。当 KHSM（经 3-氨丙基三乙氧基硅烷接枝的空心二氧化硅微球）的含量为 1.5wt%时，复合材料在宏观销盘摩擦试验中表现出显著的润滑性能（摩擦系数为 0.056，Ws 为 3.55×10-3mm·N·m）。因此，具有储油仓库和运输系统的蛛网结构复合材料有望用于高储油量和可回收的智能润滑。
