Study on Synthesis,Characterization and Physical Properties of an Anionic Surfactant

Sodium octadecyl sulfate such surfactants are synthesized from non-toxic-octadecyl alcohol,with chlorosulfonic acid as the sulfating agent.The synthesized surfactant is characterized by melting point,infrared,H-NMR spectrum studies.The physical characteristics of the surfactant,such as the Krafft point,surface tension,conductivity,and scanning electron microscope are also researched.At 30℃,the surface tension and the critical micelle concentration of the surfactant is 48mN/m and 0.2mmol/L respectively.Both the critical micelle concentration and surface tension will be reduced as the temperature increases.When the temperature increases from 30℃ to 50℃,the critical micelle concentration dropps from 0.2mmol/L to 0.1mmol/L.The krafft point is 56℃,the melting point is 209℃.