Sythesis Of New Ester Group-containing Surfactants And Their Application

The surfactant which has unique physical and chemical properties is widely used in the civil and industrial washing, textile, oil, food industry, medicine, architecture, aviation and so on. With the rapid development of scientific technology and modern civilization, people have more and higher requirement for the surfactants. Although the study of preparation and performance of surfactants has been mature, new surfactants which have special application are still widely studied. The surfactants having moderate performance, easily biodegradable, environmentally friendly and other special application will be primary development of surfactant industry.In this paper, through some simple synthesis methods, a series of environmentally friendly ester group-containing surfactants were prepared from glycerol, which are cationic, anionic, nonionic and low polyanion and zwitterionic surfactants. Their structures were characterization by FT-IR,1H NMR and XPS methods. Via the maximum bubble method (gamma), the surface tensions of the surfactants were obtained. The Critical Micelle Concentrations (cmc) of surfactants were gotten by ??lgc curve, which have a guiding significance for emulsified asphalt preparation. Using these surfactants as asphalt emulsifier, a series of emulsified asphalt were prepared and their mixing stabilities and other indexes were tested. The results show that the M1 and M5 can be used as slow crack emulsifier. The surfactants of M2 and M4 belonged to the split type emulsifier. The nonionic emulsifiers (M3) belonged to the fast cracking type emulsifier. From the results of other indexes, emulsified asphalt prepared from M1, M4 and M5 could reach to the standards for the demand of the emulsified asphalt road.In order to get uniform dispersion of micelle morphology, the cationic surfactant M1 and anionic surfactant M2-3, which exhibit similar structures but opposite charge, were choose to induce the morphological changes of micelles obtained by PS-b-PAA in DMF/H2O. The morphological changes of micelles obtained by block copolymer PS-b-PAA in DMF/H2O upon addition of the different concentrations S1 or cationic surfactant S2 were studied. Both cationic and anionic surfactants can interact with the copolymer, thus inducing the morphological transition. Zeta potentials of mixtures were test by DLS. The relation between viscosities and morphology of copolymer was studied. The reasons of the morphological changes might have two. One is two surfactants with different charge, leading to different electrostatic interaction with-COOH PAA block, and then the alkyl chain is different from the interaction of block copolymer. Second, the concentration of two surfactants of ionization ion concentration is different, so the electrostatic effect different. Adding a small amount of M1 can have great influence on micelle morphology.Because the cationic surfactant has bacteriostatic, M1 was chosen for researching the interaction with three model proteins. Three model surfaces, including Au-CH3, Au-OH, and Au-COOH, were fabricated. Surfactant adsorption on the three model surfaces and subsequent plasma protein adsorption were investigated by quartz crystal microbalance with dissipation. The mass of surfactant on the surface of Au-COOH was the largest, followed by that of the Au-CH3 surface, and that of the Au-OH surface. These results suggest that the main driving force of cationic three-chain surfactant immobilization is electrostatic interaction followed by hydrophobic interaction. Based on the results obtained, we conclude that the protein mass adsorbed on Au-CH3-M1, Au-OH-M1, and Au-COOH-M1 surfaces depends on the protein size. The immobilized M1 surfaces inhibited lysozyme adsorption, maintained the adsorption balance of bovine serum albumin, and induced fibrinogen-binding protein adsorption.Polyelectrolyte multilayers of negative charged heparin (Hep) and positive charged lysozyme (LYZ) were used to immobilize on the poly(propylene carbonate) (PPC) surface by layer-by-layer (LbL) assembly to improve hemocompatibility. X-ray photoelectron spectroscopy confirmed that the surface was successfully modified. The process of LbL and the subsequent fibrinogen adsorption were monitored using a quartz crystal microbalance with dissipation in real time. The adsorbed fibrinogen on the PPC surface formed dense side-on structures, which led to lots of platelet adhesion. However, on the surface of PPC-g-(LYZ-co-Hep)3, fibrinogen molecules formed a relatively loose adsorbed layer, which had an excellent fibrinogen resistance due to release of dissipated energy. Combined with the results of platelet adhesion, erythrocyte adhesion, and hemolysis, we concluded that the PPC-g-(LYZ-co-Hep)3 surface had high performance with hemocompatibility due to highly hydrophilicity of LYZ and anticoagulation of Hep, which can be as a candidate scaffold material for blood vessel tissue engineering.