期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 321, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2020.114486
关键词
Nonionic fluorinated surfactant; Static surface tension; Dynamic surface tension; Diffusivity coefficient; Structure-activity relationships
资金
- National Natural Science Foundation of China [21977056, 21732002]
- Tianjin Technical Expert Project [19JCTPJC57800]
Ten new nonionic fluorinated surfactants with various hydrophilic and hydrophobic chain lengths were synthesized in this study. The main determinants of surface tension were found to be mPEG molecular weight and the number of fluorocarbon atoms, with diffusivity decreasing with increasing number of fluorocarbon atoms but increasing with increasing mPEG molecular weight. Surfactant Si showed the best performance, lowering the surface tension of water to 17.89 mN/m.
The biodegradability of fluorinated surfactants can be improved by reducing the length of the fluorocarbon chain. In this study, ten new nonionic fluorinated surfactants with various hydrophilic and hydrophobic chain lengths were synthesized by means of substitution and ring-opening reactions using methoxypolyethylene glycols (mPEGs) or 2-methoxyethanol, epibromohydrin, and perfluoroalkyl alcohols as raw materials. We measured the static and dynamic surface tension of the synthesized surfactants and used the resulting data to develop structure-activity relationships. We found that mPEG molecular weight was the main determinant of minimum surface tension, and the number of fluorocarbon atoms was the main determinant of critical micelle concentration. Diffusivity decreased with increasing number of fluorocarbon atoms but increased with increasing mPEG molecular weight. Surfactant Si showed the best performance, lowering the surface tension of water to 17.89 mN/m. (C) 2020 Published by Elsevier B.V.
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