Research On The Synthesis, Propertise And Applications Of Anionic Gemini Surfactants

Comparing to ordinarysurfactants which have single hydrophobic and single hydrophilic group per molecule,Gemini surfactants are made up of two amphiphilic moieties connected at the level of the head groups by a spacer group. Most research work have manifested that Gemini surfactants have higher performance than ordinary surfactants. So they are wildly used surfactants with prospect. Owing to this, studies on the novel surfactants have attracted considerable attention in surface chemistry domain.In this paper, we studied the synthesized method of a kind of anionic Gemini surfactants which is coupled by ethylenediamin. Three kinds of anionic gemini surfactant, alkanediy l-α,ω-bis(sodium N-acy l-β-alaninate) ( DAMC-10, DAMC-12 and DAMC-16) ,were synthesized by addition, acylation and soap reaction, in which ethylenediamine,methylacrylate and fatty chloride were used as main materials. They were characterized by IR and 1HNMR.The surfactant propertise of DAMC-10, DAMC-12 and DAMC-16 were investigated, which is include Surface tention and The critical micelle concentration (cmc). And their cmc are 9.33×10-5,5.49×10-5,3.39×10-4 mol/L, it shows that their efficiency of reducing surface tention of solution is better than the ordinary surfactant. DAMC-10 and DAMC-12 also show nice wettability and foaming ability.By means of surface tention measurements , the mutual effect was sudied between the anionic Gemini surfactants DAMC-12 and four kinds of water-solubility macromolecule compound (PVP, PVA, PEG and ethyl cellulose). The result shows that they have different mutual effect with eath other. DAMC-12 and PVP have the best representative mutual effect. Their mixed system shows an typical curve of surface tention and concentration which have two inflexion.Application propertise of a series of syntheised carboxylate Gemini surfactants was studied as the degumming agent of silk fabric. It shows that they are best than traditional industrial soap,because the Geminis can take a better result than traditional industrial soap with lower dosage. As a degumming agent , DAMC-12 can takes silk fabric better handle and capillarity in 2g/L concetration and 30min time. The degumming degree is 24.1%, capillarity is 8.5cm.