Synthesis and Characterization of Interfacial Properties of a Cationic Surfactant Having Three Hydroxyl Groups

세 개의 히드록실기를 가진 양이온 계면활성제 합성 및 계면 특성에 관한 연구

  • Lee, Byung Min (Environment & Resources Research Center, Green Chemistry Division, KRICT) ;
  • Kim, Ji-Hyun (Environment & Resources Research Center, Green Chemistry Division, KRICT) ;
  • Kim, Sung Soo (NanoBio Fusion Research Center, Advanced Materials Division, KRICT) ;
  • Lim, Jong Choo (Department of Chemical and Biochemical Engineering, Dongguk University-Seoul)
  • 이병민 (한국화학연구원 계면재료공정연구그룹) ;
  • 김지현 (한국화학연구원 계면재료공정연구그룹) ;
  • 김승수 (한국화학연구원 나노기술융합연구단) ;
  • 임종주 (동국대학교-서울 공과대학 화공생물공학과)
  • Published : 2012.10.10

Abstract

In this study, a cationic surfactant BHMAS (N,N-bis-(3'-n-dodecyloxy-2'-hydroxypropyl)-N-methyl-2-hydroxyethylammonium methyl sulfate) having two lauryl and three hydroxyl groups was synthesized by the reaction of n-dodecyl glycidyl ether and 2-aminoethanol followed by the quarternization with dimethyl sulfate. The structure of the product was elucidated by $^{1}H-NMR$ and FT-IR. The CMC (critical micelle concentration) and surface tension of BHMAS at CMC condition were found to be $9.12\;{\times}\;10^{-4}$ mol/L and 28.71 mN/m respectively. Dynamic surface tension measurements using a maximum bubble pressure tensiometer indicated that a relatively long time was required to saturate the interface between air and aqueous surfactant solution. The interfacial tension measured between 1 wt% surfactant solution and n-decane reached an equilibrium value of 0.045 mN/m in 5 min. The adsorption capacity of the synthesized surfactant was observed to be excellent, which suggests that the surfactant can be used as a softening agent during a laundry process.

Keywords

cationic surfactant;hydroxyl group;solubility;surface tension;interfacial tension

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