Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (10): 2012.

• Articles • Previous Articles     Next Articles

Interaction of Polyethylene Oxide with Non-equimolarly Mixed Cationic-Anionic Surfactants

WANG Chen1, YAN Peng1, XIAO Jin-Xin1,2*   

  1. 1. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
    2. Beijing FLUOBON Surfactant Institute, Beijing 100080, China
  • Received:2008-04-21 Online:2009-10-10 Published:2009-10-10
  • Contact: XIAO Jin-Xin. E-mail: xiaojinxin@pku.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20573007)资助.

Abstract:

The interactions of polyethylene oxide(PEO) with the mixtures of sodium decylsulfonate(C10SO3) and decyltriethylammonium bromide(C10NE) were investigated by viscosity, dynamic light scattering and transmission electron microscopy techniques. It showed that PEO had no significant effects on the aggregate size of the non-equimolarly mixed cationic-anionic surfactants. Striking growth of the aggregates was observed only when the molar ratio of C10NE to C10SO3 closed to equimolar, and those strikingly grown aggregates were still vesicles. Therefore, it can be concluded that PEO has striking effects only on vesicle-involved systems, whereas no significant effect on micellar systems. Around equimolar mixing ratio, PEO exhibited stronger influence on C10NE-excessed systems than on C10SO3-excessed ones when the excess extents of C10SO3 and C10NE are the same. The growth of vesicles induced by PEO could be explained in terms of depletion interaction between PEO and vesicles. The fact that PEO has no significant effect on non-equimolarly mixed micellar systems could be ascribed to the strong electrostatic repulsion between charged micelles. The stronger influence of PEO on C10NE-excessed systems was ascribed to that the aggregates in C10NE-excessed systems were closer to equimolar composition than those in C10SO3-excessed ones.

Key words: Sodium decylsulfonate; Decyltriethylammonium bromide; Polyethylene oxide; Micelle; Vesicle

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