Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (02): 162-166.doi: 10.3866/PKU.WHXB19950213

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The Formation of Microemulsion Systems of Alkali Metal Salts of a 2-Ethylhexyl Phosphonic Acid Mono 2-Ethylhecyl Ester and the FT-IR Spectroscopic Studies

Zhou Wei-Jin, Shi Nai, Wu Jin-Guang   

  1. Department of Technical Physics,Department of Chemistry,Peking University,Beijing 100871
  • Received:1993-10-25 Revised:1994-04-01 Published:1995-02-15
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Abstract:

The demonized water was added to the alkali metal salts of 2-ethythexyl phosphonic acid mono 2-ethylhexyl ester (HA) to form microemulsion of W/O type. The maximum contents of H2O in these systems reached up to the mole ratio (H2O/MA+HA) of 6.5(Li), 12 (Na) and 66 (K), respectively. They are stable when the temperature is lower than 65℃ and no water separation was observed in the ultracentrifuge under 30000r?min-1. Their electrical conductance and infrared spectra in the range of 800-4000cm-1 were studied. The variation of stretching absorption peaks of P=O, P-O-C and P-O-H and their oscillator strengths with the amount of H2O added have been recorded.

Key words: Microemulsion, 2-Ethylhexylphosphonic acid mono2-ethylhexyl ester, Saponification, Subtraction spectrum, Hydration, FT-IR