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A green resin acid ester surfactant from colophony and xylitol: Synthesis, self‐assembly in nonaqueous solvents, and thermodynamics
Author(s) -
Qiu Hong,
Chen Xiaopeng,
Wei Xiaojie,
Liang Jiezhen,
Zhou Dan,
Tang Weixiang,
Wang Linlin
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49808
Subject(s) - surface tension , pulmonary surfactant , critical micelle concentration , chemistry , xylitol , chemical engineering , micelle , solvent , organic chemistry , thermodynamics , aqueous solution , biochemistry , physics , fermentation , engineering
An environmental friendly oil‐soluble surfactant colophony xylitol ester (CXE) is first synthesized from natural colophony and xylitol with the use of hot‐compressed water and subcritical CO 2 in a steel autoclave. In this solvent‐free system, the conversion of the reaction was up to 90.30% in 4 h. Thermal gravimetric analysis determine that its thermal stability was as high as 310°C. CXE is effective in reducing the surface tension of six different organic solvents. The greatest effect of surface tension reduction by CXE is in the case of dimethyl sulfoxide, the surface tension of the surfactant solution was as low as 36.26 mN/m at its critical micelle concentration value of 7.49 mM; The greatest effect of interfacial tension reduction by CXE is in the case of turpentine and water, the interfacial tension low to 1.51 mN/m. Furthermore, transmission electron microscope and particle size measurement showed that CXE is successfully self‐assembled into micelles, vesicles, and heteromorphic vesicles in six kinds of organic solvents. Finally, the critical micelle concentration curves at different temperatures provided the thermodynamic parameters of the aggregate formation, found that△ G agg 0 ,△ H agg 0 , and△ S agg 0 are negative and increased as the temperature increased.