Abstract
The OH proton chemical shifts and the viscosity have been examined for ethylene glycol solutions of urea and thiourea.
The OH proton chemical shifts of ethylene glycol showed an upfield shift in the presence of thiourea and a downfield shift in the presence of urea as described in the previous paper1), which indicated that urea worked as a structure maker in ethylene glycol and thiourea as a structure breaker. The viscosity data has been interpreted in terms of temperature dependence of the B coefficient, ΔB/ΔT, to find the structural change of ureas-ethylene glycol solutions. This result was similar to that obtained by the proton chemical shifts.
These results suggested that the carbonyl group in urea molecule plays an important part in the increase of the structural regularity of ethylene glycol.
