液晶润滑添加剂5CB的减摩性能研究

液晶是一类介于固体和液体之间的物态,液晶态分子排列一维或二维长程有序,在垂直于表面的方向,液晶表现固体特性,阻止表面间的直接接触,而在没动剪切方向,液晶表现为低粘度液体,可有效地降低摩擦系数。本文对向列型液晶４－正戊基－４’－氰基联苯在正十六烷和季戊四醇酯中的减摩作用及机理进行了考察。

The Friction - reducing Capability of Pentyl Cyanobiphenyl (5CB) of Nematic Liquid Crystal Used as Lubricant Additive

Compounds in liquid crystalline state display an organized structure between their solid stale and the isotropic liquid state, having long-range orientations in one or two dimensions. In the direction perpendicular to the bounding surface, they would be essentially solid and therefore opposing contact; in the shear direction, they would be essentially liquid of low viscosity and therefore make for low friction. The researches indicate that pentyl cyanobiphenyl (5CB) of nematic type provides excellent friction-reducing properties when added in hexadecane, but adding nematic 5CB into pentaerythritol ester, the friction coefficient is not reduced at all, but it can be reduced greatly after a period of friction induction with further addition of parallel aligning agent sebacic acid.