Synthesis and Surface Properties of Polyether-Based Silicone Surfactants with Different Siloxane Groups |
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| Authors: | Jinglin Tan Ziyan He Yongxiang Miao Miaomiao Lin |
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| Affiliation: | 1. School of Chemical and Environmental Engineering, Jiujiang University, Jiujiang Jiangxi, 332005, China;2. School of Chemical and Environmental Engineering, Jiujiang University, Jiujiang Jiangxi, 332005, China Jiangxi Province Engineering Research Center of Ecological Chemical Industry, Jiujiang University, Jiujiang Jiangxi, 332005, China |
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| Abstract: | A series of polyether-based silicone surfactants with different hydrophobic chains (trimethylsiloxy, triethylsiloxy, and triisopropylsiloxy) were synthesized. The molecular structures were confirmed using 1H nuclear magnetic resonance (NMR), 13C NMR, 29Si NMR, and fourier transform infrared spectroscopy (FT-IR). The effect of the siloxane groups on the physicochemical properties, surface tension (γ), critical micelle concentration (CMC), surface tension at the CMC (γCMC ), adsorption efficiency (pC20), surface pressure at the CMC (πCMC ), maximum surface excess (Γmax ), single silicone surfactant molecule at the air/water interface (Amin ), and the standard free energy of adsorption ( ), of the polyether-based silicone surfactants was investigated. Results indicate that the polyether-based silicone surfactants can reduce the surface tension of water to approximately 25–31 mN m−1 and the surface activity of silicone surfactants is enhanced with increasing branched trimethylsiloxyl and sterically hindered siloxane groups. |
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| Keywords: | Polyether Nonionic silicone surfactant Surface activity Adsorption |
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