物理化学学报 >> 1998, Vol. 14 >> Issue (09): 794-798.doi: 10.3866/PKU.WHXB19980906

研究论文 上一篇    下一篇

钾皂化HEHPEHE的谱学性质及微乳液的形成

李彦, 李泉, 周维金, 吴瑾光   

  1. 北京大学化学与分子工程学院,稀土材料化学及应用国家重点实验室,北京 100871
  • 收稿日期:1997-12-26 修回日期:1998-03-03 发布日期:1998-09-15
  • 通讯作者: 吴瑾光

Spectroscopic Properties of Potassium Saponified HEHPEHE and the Formation of w/o Microemulsions

Li Yan, Li Quan, Zhou Wei-Jin, Wu Jin-Guang   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871
  • Received:1997-12-26 Revised:1998-03-03 Published:1998-09-15
  • Contact: Wu Jin-Guang

摘要:

运用傅立叶变换红外光谱研究了钾皂化2-乙基已基磷酸单2-乙基巴基酯(简称HEHPEHE或P507)的性质,同时配合激光光散射技术研究皂化应对形成微乳液性能的影响.红外光谱的研究表明,皂化度(αs)超过60%时,(K,H)EHPEHE呈现酸盐体系的特殊性质,体系对水的增溶能力迅速增大,该体系开始具有形成微乳液的能力;αs为75%左右时,体系对水的增溶能力最强;大于75%时,随着皂化度的继续增加,体系对水的加溶能力迅速下降.激光光散射的实验结果表明,αs为75%时,微乳体系中的平均液滴半径达到最大值(103.8nm). 红外光谱的结果证明形成微乳液对HEHPEHE分子中的P-O-C、P=O和P-O-H均与水分子有不同程度的相互作用.

关键词: 2-乙基已基磷酸单2-乙基已基酯(HEHPEHE), w/o微乳液, 酸盐体系, 红外光谱, 激光光散射

Abstract:

The properties of potassium saponified 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (HEHPEHE or P507) as well as the formation of microemulsions (water/(K,H )EHPEHE/n-heptane)have been investigated by means of Fourier Transform Infrared Spectroscopy(FT-IR).The stretching bands of P-O-H and the P-O-C shift with the saponification due to the interaction of HEHPEHE and the saponified resultant (KEHPEHE), named acid-salt system. The absorbance of P-O-H stretching vibration varies to lower frequencies while P-O-C stretching band shifts to higher wavenumbers with the increases of saponification. Furthermore, the P-O-C stretching band splitted into two distinct peaks after the saponification exceed 60%.Water/(K,H) EHPEHE/n-heptane microemulsions could be formed when the saponification was higher than 60% . The water solubility and the average diameter of droplets in microemulsion reach their maxima at the saponification of 75%.

Key words: 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester(HEHPEHE or P507), Microemulsions, Acid-salt system, FT-IR, Laser-scattering