Zhang Jiaying, Bo Shangshang, Wang Rui, Fang Junhui, Wang Xin-Gang, Bai Yanyan, Ma Zhengfeng, Liang Yijing, Zhang Ming, Yu Qiangliang, Cai Meirong, Zhou Feng, Liu Weimin
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China.
Hangzhou Hikvision Digital Technology Co., Ltd, Hangzhou 310051, China.
ACS Appl Mater Interfaces. 2022 Oct 12;14(40):45934-45944. doi: 10.1021/acsami.2c14306. Epub 2022 Sep 27.
Lubricants performing better in machinery systems would lead to the remarkable reduction of environmental pollution problems and the significant improvement of fuel economy. A new family of supramolecular polymer gel lubricants with urea groups has been successfully prepared via self-assembling noncovalent bonds. These newly designed supramolecular polymer gels were well characterized with field-emission scanning electron microscopy, proton nuclear magnetic resonance, attenuated total reflection-Fourier transform infrared spectroscopy, a rheometer, oscillating reciprocating friction, and a wear tester. Compared to low molecular weight supramolecular gels, the covalent and noncovalent bonds cooperated in the supramolecular polymer gel based on macromolecules. Hence, the mechanical properties and viscoelasticity of gel lubricants are greater than those of the low molecular weight supramolecular gels. Furthermore, owing to the longer chain length of polymer gelators, the thickness of the adsorbed film formed on the surface lubricated by macromolecules is thicker than that on the surface lubricated by low molecular weight supramolecular gels, which positively correlates with the lubricating property, making supramolecular polymer gels based on macromolecules better than low molecular weight supramolecular gels. Excitingly, the supramolecular polymer gels based on macromolecules exhibit more excellent thermal reversibility, creep recovery, and thixotropic properties, which not only achieve the lubricating property but also lead to the remarkable reduction of environmental pollution problems due to oil creeping.
在机械系统中表现更优的润滑剂将显著减少环境污染问题，并大幅提高燃油经济性。通过自组装非共价键成功制备了一种含脲基的超分子聚合物凝胶润滑剂新家族。这些新设计的超分子聚合物凝胶通过场发射扫描电子显微镜、质子核磁共振、衰减全反射傅里叶变换红外光谱、流变仪、往复振荡摩擦和磨损测试仪进行了充分表征。与低分子量超分子凝胶相比，基于大分子的超分子聚合物凝胶中，共价键和非共价键协同作用。因此，凝胶润滑剂的机械性能和粘弹性比低分子量超分子凝胶更强。此外，由于聚合物凝胶剂的链长更长，在由大分子润滑的表面形成的吸附膜厚度比由低分子量超分子凝胶润滑的表面更厚，这与润滑性能呈正相关，使得基于大分子的超分子聚合物凝胶优于低分子量超分子凝胶。令人兴奋的是，基于大分子的超分子聚合物凝胶表现出更优异的热可逆性、蠕变恢复和触变性能，这不仅实现了润滑性能，还因油的蠕变显著减少了环境污染问题。
