Synthesis Of Amide Small Molecule Functional Compounds And Their Application In Interface Chemistry

Gemini surfactants have higher surface activities due to their specific molecular structures,lower critical micelle concentration,and better salt tolerance.The amide surfactants are mild and non-irritating to the skin,have good water solubility,and can be used in the cosmetic industry,which are easily biodegraded with little environmental pollution.Although amide surfactants have many excellent properties,their research is not deep enough.Carboxylate anionic surfactants enhance oil recovery.However,there are few studies on the synthesis of anionic gemini surfactants.Therefore,the subject is to synthesize an amide carboxylate anionic gemini surfactants and determine its surface activities.In this paper,the related concepts and characterization parameters of gemini surfactants are introduced firstly,then the work of the predecessors is summarized.On the basis of this,the synthetic route is optimized,and two new types of anionic genomic surfaces containing amide bonds are synthesized.The active agent was characterized by nuclear magnetic resonance spectroscopy,infrared spectroscopy and mass spectrometry to determine the structure of the target compound.Then the surface tension method and conductivity method are used to determine the critical micelle concentration of the molecule,and then other characterization parameters are calculated according to the formula,including the maximum adsorption amount at the gas-liquid interface,the limit occupied area of the single molecule at the interface,and the surface tension of the solvent.The efficiency,as well as the relative tendency of micelle formation in the bulk phase and adsorption at the interface,indicate that both molecules have lower critical micelle concentration,better surface activity,and lower oxygen-containing molecules in the linking group.The critical micelle concentration indicates that the flexible hydrophilic linking group helps to reduce the critical micelle concentration of the molecule,probably because the hydrophilic spacer readily forms hydrogen bonds with water,and the flexible carbon chain bends the spacer group.The aqueous phase forms an outwardly convex micelle surface.Then,the effects of different kinds of salts and their concentrations on the surface properties were investigated,including seven salts of NaCl,MgCl₂,CaCl₂,Na₂CO₃,K₂CO₃,CH₃COONa and NH₄Cl.The surface tension under different concentrations was measured.The results showed surface activity.The combination of the agent and the salt can promote the formation of micelles to a certain extent,the adsorption amount at the interface increases,the occupied area of the single molecule decreases,the efficiency of reducing the surface tension of the solvent is improved,and eventually the surface activity is improved.Surfactants are well tolerated by a wide variety of salts,which opens up their wider application.