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China Surfactant Detergent & Cosmetics ›› 2018, Vol. 48 ›› Issue (10): 558-563.doi: 10.13218/j.cnki.csdc.2018.10.003

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Effects of the spacer on the surface activity and foaming properties of betaine Gemini surfactants

LAI Xiao-juan1,2,LIU Pei1,TIAN Wei3,WANG Jie1,HUI Yan-ni3,JIA You-liang3   

  1. 1.Shaanxi Key Laboratory of Chemical Additives for Industry,Shaanxi University of Science and Technology,Xi'an,Shaanxi 710021,China;
    2.Shaanxi Research Institute of Agricultural Products Processing Technology,Xi'an,Shaanxi 710021,China;
    3.Research Institute of Oil/Gas Technology,Changqing Oilfield Branch Company,PetroChina,Xi'an,Shaanxi 710021,China
  • Online:2018-10-20 Published:2019-03-18

Abstract: A series of betaine-type Gemini surfactants (Cs-BGS where C is the methylene of the spacer,s=2,4,6) were synthesized from sodium 3-chloro-2-hydroxypropanesulfonate,oleamidopropyl dimethylamine and bromoalkane.The chemical structures of the prepared compounds were characterized by FT-IR and 1H NMR.Their critical micelle concentration (cmc)in the aqueous solution at 25 ℃ was determined by Wilhelmy and electrical conductivity methods.The results show that with the increasing length of the spacer,the values of cmc and equilibrium surface tension (γcmc)are increased.C2-BGS has exhibited the lowest cmc,nice efficiency in reducing surface tension (pc20),strong adsorption at the air-water interface,and relatively good foaming performance.In addition,the adsorption and micellization behaviors of Cs-BGS were estimated by pc20,minimum surface area per molecule (Amin),standard adsorption free energy (ΔG0ads)and standard micellization free energy (ΔG0mic).The results show that these properties of Cs-BGS are significantly influenced by the length of the spacer,and the ability to promote adsorption is stronger than to promote micellization.

Key words: Gemini surfactant, betaine, spacer group, surface activity, foaming properties

CLC Number: 

  • TQ423