No abstract

An anionic Gemini surfactant, oxalamide lauryl succinate sodium sulfonate, was synthesized successfully through amidation, esterification and sulfonation reactions under microwave irradiation conditions by using maleic anhydride, ethylenediamine, lauryl alcohol, sodium sulfite as the starting materials. The best reaction conditions for synthesize the target product were obtained by single factor and orthogonal optimization methods. FTIR, elemental analysis and 1H‐NMR analysis were used to confirm the chemical structure of the surfactant. The critical micelle concentration (CMC) in aqueous solution, surface tension, emulsification capacity and foaming power were determined. The critical micelle concentration and γCMC are respectively equal to 3.5 × 10−4 mol L−1 and 21.5 mN m−1. It was found that microwave‐assisted synthesis is an efficient means of preparation of this anionic Gemini surfactant with shorter times and higher yields.

Ethyl cyanoacetate is an important chemical intermediate and has been used widely. Ethyl cyanoacetate was prepared by esterification of cyanoacetic acid and absolute ethanol with mixed catalyst (the same proportion of silicotungstic and p-toluene sulfonic acid as catalyst). The influence factors of the amount of catalyst, n(cyanoacetic acid): n ( absolute ethanol), reaction time and reaction temperature on the esterification rate was investigated by orthogonal experiment of four factors and three levels. The product was analyzed by gas chromatography to determine the optimum reaction conditions.

No abstract

The Anionic-nonionic Gemini Surfactant oxalamide polyoxyethylene lauryl ether (7) succinate sodium sulfonate (OPLES-7) was synthesized. It was mixed with the dodecyl glucoside in different ratios to enhance application performance. The mixed critical micelle concentration (CMC) of the binary surfactant systems was determined by surface tension measurement. Critical micelle concentration of mixed system is 0.141mmol ⋅ L−1 when the molar fraction of OPLES-7 to dodecyl glucoside 1:1. The influence of NaCl on surface properties of the mixed system was also studied. The surface activity was enhanced with the increase of NaCl concentration.