| Due to the wear caused by friction,a large amount of energy waste and economic loss are caused,so finding new lubricants to reduce the wear caused by friction is an urgent problem.Lyotropic liquid crystal is a substance between solid and liquid,which has both the fluidity of liquid and the ordered structure of solid.Among them,lamellar liquid crystal can be used as a lubricant because of its special layered structure,which can slide under the action of external force.However,most of the lamellar liquid crystal systems currently focus on the research of water systems.Lamellar liquid crystals in water systems will cause corrosion of metal friction pairs and aggravate the waste of resources.Therefore,the construction of lamellar liquid crystals in non-aqueous systems is of great significance to solve such problems.The main purpose of this paper is to construct lamellar liquid crystal system with different non-aqueous solvents and to explore the relationship between its structure and lubrication performance and anti-corrosion performance.It provides a theoretical basis for the construction of lamellar liquid crystals in non-aqueous system.The main content is divided into the following three parts:(1)The lamellar liquid crystal systems of dodecyl benzene sulfonic acid(DBSA)/H2O,DBSA/monoethanolamine(MEA)and DBSA/diethanolamine(DEA)were constructed,and the temperature phase diagrams of each system were drawn.The relationship between lamellar liquid crystal structure and lubricity performance was explored by rheological test and lubricity test.The relationship between lamellar liquid crystal structure and anticorrosion performance was explored by weight loss method,electrochemical test and computational chemistry method.The mechanism of lubrication and anti-corrosion was revealed.It was found that the lubrication properties of non-aqueous lamellar liquid crystals DBSA/MEA and DBSA/DEA were better than those of aqueous DBSA/H2O lamellar liquid crystals,and DBSA/MEA lamellar liquid crystals had better anti-corrosion performance.(2)Because ionic liquids have lubricating properties,ionic liquids ethanolammonium nitrate(EOAN),3-amino-1-propanol nitrate(POAN)and 4-amino-1-butanol nitrate(BOAN)are synthesized.DBSA/EOAN,DBSA/POAN and DBSA/BOAN non-aqueous lamellar liquid crystal systems using ionic liquids as solvents are constructed,and the temperature phase diagrams of each system are drawn.The effect of different alkyl chain structure of ionic liquids on the structure of lamellar liquid crystals was investigated by small angle X-ray scattering(SAXS).The relationship between the composition,structure,lubrication and anti-corrosion properties of lamellar liquid crystals was studied.It was found that the ionic liquid lamellar liquid crystal system had less wear on the friction pair and could play a better role in reducing friction and anti-wear.The longer the ionic liquid alkyl chain was,the better the anti-corrosion effect was.(3)The ionic liquids ethanolammonium formate(EOAF),3-amino-1-propanol formate(POAF)and 4-amino-1-butanol formate(BOAF)with different anionic structures were synthesized,and the non-aqueous lamellar liquid crystal systems of DBSA/EOAF,DBSA/POAF and DBSA/BOAF were constructed.The temperature phase diagrams of each system were drawn.The effects of ionic liquids with different structures on the structure of lamellar liquid crystals were investigated by small angle X-ray scattering(SAXS),and the relationship between different molecular structures and lubrication properties and anticorrosion properties was explored by lubrication performance test and anti-corrosion performance test.The results showed that under the same test conditions,the anti-corrosion performance of ionic liquids was improved with the increase of alkyl chains of ionic liquids,and the anti-corrosion performance of formate ionic liquids was better than that of nitrate ionic liquids at the same alkyl chain length. |
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