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Synthesis, Surface Active Properties of Novel Gemini Surfactants with Amide Groups and Rigid Spacers
Authors:Donghui Hu  Xiangfeng Guo  Lihua Jia
Affiliation:1. Key Laboratory of Fine Chemicals (Qiqihar University), College of Heilongjiang Province, Qiqihar, 161006, China
2. College of Chemistry and Chemical Engineering of Qiqihar University, Qiqihar, 161006, China
Abstract:A series of novel cationic gemini surfactants, bis-(N-(3-alkylamido-propyl)-N,N-dimethyl)-p-phenylenediammonium dichloride, were synthesized. The structures of the gemini surfactants were characterized by IR, 1H NMR and 13C NMR. The Krafft temperatures of surfactants were determined through conductivity, the surface active properties in aqueous solution were studied at various temperatures by surface tension and conductivity. The thermodynamic functions of micellization process of the surfactants were also calculated by conductivity. The Krafft temperatures of the surfactants were 12, 13 and 28 °C. The values of CMC and Γ max decreased with increasing the length of hydrophobic chains, but the values of CMC and α increased with increasing temperature. The process of micellization is a spontaneous, exothermic and entropy-driven process.
Keywords:Cationic gemini surfactants  Amide group  Krafft temperature  Surface activity  Thermodynamic functions
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