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Synthesis and Surface-active Properties of Novel Quaternary Ammonium Salt Gemini Surfactants

Author: YuChaoChao
Tutor: LiHongQi
School: Donghua University
Course: Applied Chemistry
Keywords: Gemini surfactants Synthesis Surfactant Conductivity Foamability Cationic surfactant Ionic liquids
CLC: TQ423
Type: Master's thesis
Year: 2012
Downloads: 79
Quote: 0
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Abstract


In recent years , new gemini surfactants become a focus for researchers . The gemini surfactants are a novel class of surfactants, it has two hydrophilic groups and two hydrophobic groups, connected through an intermediate group . Because of its unique structure , gemini surfactants exhibit superior surfactant . Designed two routes , as raw material, is diethylamine , 1 -3- dibromopropane replaced amination raw materials, ethylene glycol , epichlorohydrin and diethylamine , respectively, and quaternized 1 - bromo long chain alkane ( 1 - bromo- octane , 1 - bromo- decane , 1 - bromo- dodecane , 1 - bromo- tetradecane , 1 - bromohexadecane ) occurs synthesized by the reaction of a series and b series two series of quaternary ammonium Gemini surfactants with the nature of the ionic liquid , and the use of IR , 1HNMR , 13C NMR and MS characterization of the structure of all new compounds . France measured the synthesis of quaternary ammonium Gemini surfactant the CMC and γCMC, and confirmed the accuracy of the measurement by conductivity method . Calculated surface adsorption amount Γcmc , molecular minimum cross-sectional area Acmc, reduce the surface tension of efficiency pC20 , reduce the effectiveness γcmc of surface tension , critical micelle concentration CMC adsorption free energy △ ads0 and micellar free energy △ mic0 ? ( ? ) the relationship between their structure and properties of a preliminary study . The results show that : the compared with traditional quaternary ammonium table active agent , and two series of novel Gemini quaternary ammonium surfactants have lower critical micelle concentration and higher table activity. In addition, we studied the ability of class surfactant foam , and results showed that the hydrophobic group carbon atoms 12 and 14 of the gemini surfactant foaming foam stabilizing ability .

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