In the present work, sodium 2-laurylamido isobutyrate was synthesized from 2-aminoisobutyric acid, NaOH and lauroyl chloride by the Schotten-Baumann condensation. Fourier transform infrared spectroscopy, mass spectroscopy and nuclear magnetic resonance spectroscopy were used to characterize the products, and confirming the successful synthesis of sodium 2-laurylamido isobutyrate. The influence of temperature on the surface tension of sodium 2-laurylamido isobutyrate was studied, comparing the chemical properties of the surface with those of sodium N-lauroyl sarcosinate. The results indicate that both surfactants have a similar pC 20, while the critical micelle concentration (CMC) and the surface tension at the critical micelle concentration (γ CMC) of sodium 2-laurylamido isobutyrate are higher than those of sodium N-lauroyl sarcosinate. Further studies on the thermodynamic parameters of sodium 2-laurylamido isobutyrate and sodium N-lauroyl sarcosinate indicate that the formation of micelles is a spontaneous exothermic process mainly driven by entropy. According to the dynamic surface tension of sodium 2-laurylamido isobutyrate and sodium N-lauroyl sarcosinate, the molecular adsorption of the two components mixture change from the initial diffusion controlled adsorption to the later mixed dynamic controlled adsorption.

中文翻译：

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2-十二烷基氨基异丁酸钠的合成及性能研究

本工作以 2-氨基异丁酸、NaOH 和月桂酰氯为原料，通过 Schotten-Baumann 缩合反应合成 2-月桂酰氨基异丁酸钠。用傅里叶变换红外光谱、质谱和核磁共振光谱对产物进行了表征，证实了2-十二烷基氨基异丁酸钠的合成成功。研究了温度对 2-月桂酰氨基异丁酸钠表面张力的影响，将表面的化学性质与 N-月桂酰肌氨酸钠的化学性质进行了比较。结果表明，两种表面活性剂具有相似的 pC 20, 而临界胶束浓度 (CMC) 和临界胶束浓度下的表面张力 (γ 中央军委) 2-月桂酰氨基异丁酸钠的含量高于 N-月桂酰肌氨酸钠。对2-月桂酰氨基异丁酸钠和N-月桂酰肌氨酸钠的热力学参数的进一步研究表明，胶束的形成是一个主要由熵驱动的自发放热过程。根据2-月桂酰氨基异丁酸钠和N-月桂酰肌氨酸钠的动态表面张力，两种组分混合物的分子吸附由最初的扩散控制吸附转变为后期混合的动态控制吸附。