THE BEHAVIOR OF UREAS IN ETHYLENEGLYCOL

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  • Nango Mamoru
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture
  • Katayama Akira
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture
  • Kuroki Nobuhiko
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture

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Other Title
  • エチレングリコール中における尿素類の挙動
  • エチレン グリコールチュウ ニ オケル ニョウソルイ ノ キョドウ

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Description

There are some controversies about the nature of urea aqueous solutions, which is important because of their well-known effects like hydrotropic agent and protein denaturation. The present work reports the OH proton chemical shift of ethyleneglycol and the solubility of biphenyl in ureas- ethyleneglycol solutions to examine the behavior of ureas in ethyleneglycol concerning that in water. The ureas are urea, monomethylurea (MU), N, N′-dimethylurea (DMU) and tetramethylurea (TMU).<br>The OH proton chemical shift of ethyleneglycol showed a downfield shift in the presence of urea and an upfield shift in the presence of TMU. This indicates that urea works as a structure maker in ethyleneglycol and TMU as a structure breaker.<br>The solubility of biphenyl in ethyleneglycol from 10 to 40°C at 10°C intervals decreased in the presence of urea and increased in the presence of MU, DMU and TMU (TMU_??_DMU>MU). Thermodynamic data showed that urea works as a structure maker in ethyleneglycol and MU, DMU, and TMU as a structure breaker.<br>These results show that urea has the property of a structure maker in the solution which has a less regular structure like ethyleneglycol.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 33 (7), T314-T317, 1977

    The Society of Fiber Science and Technology, Japan

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