物理化学学报 >> 1995, Vol. 11 >> Issue (09): 818-823.doi: 10.3866/PKU.WHXB19950911

研究论文 上一篇    下一篇

正、负离子表面活性剂混合水溶液的相行为

肖进新,赵国玺   

  1. 北京大学化学系,北京 100871
  • 收稿日期:1994-10-12 修回日期:1995-02-06 发布日期:1995-09-15
  • 通讯作者: 赵国玺

Phase Behavior of Aqueous Mixtures of Cationic-anionic Surfactants

Xiao Jin-Xin,Zhao Guo-Xi   

  1. Department of Chemistry,Peking University,Beijing 100871
  • Received:1994-10-12 Revised:1995-02-06 Published:1995-09-15
  • Contact: Zhao Guo-Xi

摘要:


通过对C12H25N(CmH2m+1)3Br-CnH2n+1OSO3Na(m=1、2、3、4,n=10、12)混合体系相行为的研究,总结出正、负离子表面活性剂混合体系普遍存在三个浓度区的规律,即在低浓度与高浓度时为透明均相溶液,中间浓度区为复相体系.而且表明,随极性基体积增大,混合体系形成均相溶液的能力增加;在高浓度区,疏水链长短对混合体系形成均相溶液能力的影响与低浓度区的情况不完全一致,有时会出现疏水链较短的体系形成均相溶液的能力反而较差的“反常”现象.

关键词: 正、负离子表面活性剂, 相行为

Abstract:

The phase behavior of the aqueous mixtures of C12H25N(CmH2m+1)3Br and CnH2n+1 OSO3Na (m=1,2,3,4. n=10,12) has been studied. It has been summarized that there exists commonly three concentration regions for the aqueous mixtures of cationicanionic surfactants. That is, the mixtures form homogeneous transparent solutions at low and high concentrations and heterogeneous region at mediate concentractions. It has shown that the ability forming homogeneous solutions for such systems increases with the increase of the sizes of polar groups and that of the effect of the length of hydrophobic moiety on the ability forming homogeneous solutions in high concentrations is not consistent completely with that in low concentrations, and sometimes the mixed system with short hydrophobic moiety has poorer ability forming homogeneous solutions than that with long hydrophobic moiety.

Key words: Cationic-anionic surfactants;Phase behavior