PREPARATION AND PROPERTIES OF NEW ANION-ACTIVE AND NON-IONOGENIC GEMINI SAM BASED ON OXYPROPYLATED ETHYLENEDIAMINE AND CARBONIC ACIDS (STEARIC AND OLEIN)

Abstract

Synthesis of new ionic and non-ionic gemini surfactants based on N,N,N,'N'-tetrakis(2- hydroxypropyl)ethylenediamine and higher carboxylic acids (stearin and olein) obtained from oxypropylation of ethylenediamine with propylene oxide in a 1:4 mol ratio has been done. Structures of synthesized surfactants were identified by IR-spectroscopy method. Based on the values of surface
tension and electrical conductivity, the values of the critical micellar thickness and minimum surface tension of these surfactants were determined. It was found that the presence of an unsaturated bond in the alkyl group reduces the critical micelle concentration for ionic surfactants. In addition, nonionic surfactants have a lower critical micelle concentration than anionic surfactants. By comparing the surface tension values obtained by the tensiometric method at the water-air interface, it was
found that anionic surfactants have a more pronounced ability to reduce surface tension. Localization properties of synthesized surface-active substances of thin oil layer spread on the surface of waters with different degree of mineralization were studied.