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Citation: Li Yan, Li Quan, Zhou Wei-Jin, Wu Jin-Guang. Spectroscopic Properties of Potassium Saponified HEHPEHE and the Formation of w/o Microemulsions[J]. Acta Physico-Chimica Sinica, ;1998, 14(09): 794-798. doi: 10.3866/PKU.WHXB19980906 shu

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

1.
State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871

Received Date: 26 December 1997
Available Online: 15 September 1998

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