Synthesis And Properties Of Cationic Gemini Surfactant Containing Ester Bond And Interaction Between It And Hydrolyzed Polyacrylamide

Gemini surfactant molecule is regarded by the same or almost the same two amphiphilic components, at or near the base of its head connected by a spacerformed by a chemical bond. Compared with conventional surfactants, Gemini surfactant molecule having at least two hydrophilic groups (ionic or polar groups) and two hydrophobic chains, so it has very excellent performance than the conventional surfactant, it was widely used in household chemicals, oil and gas development, biotechnology, nanomaterials and environmental remediation.With the properties of the surfactant-depth, scholars have found that mixed with the polymer, mixture capable of generating excellent performance superior to a single substance. In view of the excellent performance of the surfactant and polymer mixed system, it has become a very important area of research, and is widely used in many fields. This requires researchers who need to use advanced testing methods, strengthening the study of mixture in composition, structure and interaction mechanism from microscopic, systematic understanding the law of interactions.In this article, we synthesized a series of cationic gemini surfactants containing different length spacer ester bond (N-n-Me) using n-heptanoic acid, N, N-dimethylethanolamine and different lengths dibromoalkane. The structure and stability of these surfactants were characterized by 1HNMR,FT-IR spectra and TGA. The aggregation behavior of gemini surfactant in aqueous solution was studied by surface active, conductivity, fluorescence measurements. The results showed that four kinds of Gemini surfactants both have high surface activity, lower critical micelle concentration (CMC) and excellent thermal stability. In addition, we also obtained some properties related to the variation of the spacer length:With the increase of spacer length, the critical micelle concentration (CMC), the lowest surface tension (γcmc) and surfactant molecular cross-sectional area (Amin) are all gradually decreases.We also studied interaction between four kinds of cationic Gemini surfactants containing ester bond (N-n-Me) and partially hydrolyzed polyacrylamide(HPAM) by surface tension, conductivity, fluorescence probe and rheological method. There are some interactions between surfactants moleculars and polymers moleculars, thus mixing system exhibits more excellent performance than a single Gemini surfactant, for example, mixed system allows the surface tension of the solution reduced even further. Moreover, The critical aggregation concentration (CAC) of mixture system was less than CMC of single Gemini surfactant, that to say, interaction occurred before the critical micelle concentration of a single Gemini surfactant, which reducing the amount of surfactant is more environmentally friendly. Meanwhile, the viscosity of the mixed system exhibits a first increase and then decreasing trend, indicating that by controlling the amount of Gemini surfactant we can control the viscosity of the system.At the same time, due to different spacer length of a series of synthetic Gemini surfactants, we also got the performance of the hybrid system with the changes of spacer length. With the increase of the spacer length, the mixture system can achieve a minimum surface tension by lower amount of Gemini surfactant; We can control the viscosity of systems in a greater range; Viscoelastic of hybrid system are gradually increase.Therefore, this complex system will be a huge potential and value in daily chemicals,oil and gas development, biotechnology, nanomaterials and environmental remediation fields.