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Synthesis and Micellization of Organosilicon Gemini Quaternary Ammonium Surfactants
Author(s) -
Li Junying,
Yang Pengfei,
Sha Zuoliang,
Li Tianduo,
Liu Yaming
Publication year - 2015
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-014-1629-7
Subject(s) - chemistry , organosilicon , aqueous solution , enthalpy , solvent , alkyl , bromide , ammonium , ammonium bromide , standard enthalpy of formation , inorganic chemistry , solvent effects , organic chemistry , pulmonary surfactant , thermodynamics , biochemistry , physics
A novel class of organosilicon gemini quaternary ammonium surfactant alkyl‐ α , ω ‐bis(diethyl‐methyl‐dimethoxy‐silopropyl ammonium bromide) ( α , ω = 1,4; 1,6; 1,8) was synthesized and characterized by 1 H‐nuclear magnetic resonance (NMR) and elemental analysis. It is found that the quaternization reaction has two steps: first single quaternization and then double quaternization. The effect of solvent on convert ratio has the following sequence: polar aprotic solvents > polar protic solvents > aromatic solvents. The electrical conductivity of aqueous solution was measured at 20, 25, 30 and 35 °C, and the thermodynamic properties of Δ H m 0 , Δ G m 0and T Δ S m 0were calculated according to the mass action model and Gibbs equation. It is shown that the enthalpy driven and entropy driven are almost equal in the micellization of [SiC 3 ‐4‐SiC 3 ]Br 2 and [SiC 3 ‐6‐SiC 3 ]Br 2 , but in the micellization of [SiC 3 ‐8‐SiC 3 ]Br 2 , the enthalpic contribution becomes significant and the effect of thermal is greater than the degree of order in the micellization.