The Synthesis Of Derivate Of Thiadiazole And Application In Magnetorheological Fluid

Magnetorheological (MR) suspensions usually consisted of micron-sized magnetizable particles, carrier liquid and additives. They have a unique ability to undergo rapid, nearly completely reversible, and significant (～10~5-10~6 times) changes in their apparent viscosity on application of an external magnetic field. They can be used to make many kinds of intelligent apparatus, Such as MR damper, MR brake and so on. One of the key techniques for MR fluids application is to improve the properties of magnetic particles to offer high shear stress, high stability and high ant-oxidation to the MR fluid based them. To obtain the aim, two kinds of surfactants were systhesized and characterized. Furthermore, two kinds of composite particles, and MR fluids were prepared and characterized. The results show that the designed surfactants can modify the properties of carbonyl iron particles and make the MR fluids high shear stress and better stability.Two derivers of 2,5-dimercapto-l,3,4-thiadiazole(DMCT) and di-DMCT were systhesized and characterized by FT-IR and Raman spectroscopic analysis. The results confirm the object products. Meanwhile novel core-shell particles were prepared and characterized by SEM,TEM,VSM,TG/DSC.To compare the effect of different surfactants on modifying the surface of carbonyl iron particles, two new chelating surfactants were synthesized with 2-amino-5-mercapto-1, 3, 4-thiadiazole (AMTD), 1-Bromohexadecane and chloroactic acid. The chelating surfactants were characterized by FT-IR and Raman spectroscopic analysis. Using the obtained Chelating surfactants and carbonyl iron particles as raw materials, novel core-shell particles were prepared and characterized by SEM,TEM,VSM,TG/DSC.The influences of synthesized surfactants on anti-sedimentation, off-state viscosity, field-induced shear stress and responsive time of magnetorheological fluid have been studied. The results show that chelation surfactant is better than conventional surfactant for modifying magnetorheological fluid. The magnetorheological fluid modified by chelating surfactants exhibits excellent properties and has better anti-sedimentation ability, anti-agglomeration ability and field-induced shear stress.