Synthesis and characterization of novel alkoxy nonionic biosurfactants |
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| Authors: | Xiaopeng Sun Hanping Li Shuangquan Lai Jiezhou Pan Weining Du |
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| Institution: | 1. National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, China;2. Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu, China |
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| Abstract: | A series of novel alkoxy nonionic biosurfactants were synthesized by ring-opening reaction of methoxy poly(ethylene glycols) and alkylene oxide. The chemical structures of these biosurfactants were confirmed by Fourier-transform infrared spectroscopy (FTIR) and 1HNMR spectra. The surface tensions of these nonionic biosurfactants in the aqueous solutions were determined using a surface tensionmeter. The results showed that the critical micelle concentrations decreased with the increase of hydrophobic chain. However, due to the effect of intermolecular hydrogen bonding, the critical surface tensions of these nonionic biosurfactants increased with increasing the hydrophobic chain and were lower than those of conventional nonionic biosurfactants. Meanwhile, the effects of electrolytes on surface tension of these nonionic biosurfactants were slight. Due to the excellent surface activity, these alkoxy nonionic biosurfactants could have great potential in cleansing, oil recovery, and drug delivery. |
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| Keywords: | Alkoxy nonionic biosurfactants characterization intermolecular hydrogen bonding surface activity synthesis |
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