Abstract
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.
Funding source: Natural Science Foundation of Jiangsu Province
Award Identifier / Grant number: BK20190605
Funding source: Fundamental Research Funds for the Central Universities
Award Identifier / Grant number: JUSRP221018
Funding source: Key Laboratory of Cosmetic Safety Assessment
Funding source: National Medical Products Administration
About the authors
Ying Li, Postgraduate, she is currently involved in researching various aspects of surfactant application and synthesis.
Jian Huang, Postgraduate, he is currently involved in researching various aspects of surfactant application and synthesis.
Liangliang Lin, Associate professor, he received his Ph.D. degree in 2018 from the Eindhoven University of Technology.
Hujun Xu, Professor, he received his Ph.D. degree in 2005 from Nanjing University of Science and Technology, P.R. China. He has been involved in surfactants and detergents for over 30 years. He has published over 100 papers in the field of surfactants and detergents.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: We would like to acknowledge the financial support from the Natural Science Foundation of Jiangsu Province (BK20190605), the Fundamental Research Funds for the Central Universities (JUSRP221018), and the Key Laboratory of Cosmetic Safety Assessment, National Medical Products Administration, Guangdong Institute for Drug Control (KF2021014).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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