甘油
增塑剂
流变学
粘度
氢键
软化
化学
化学工程
电介质
分子
材料科学
热力学
分析化学(期刊)
高分子化学
有机化学
复合材料
物理
工程类
光电子学
作者
Mikkel H. Jensen,Catalin Gainaru,Christiane Alba‐Simionesco,Tina Hecksher,Kristine Niss
摘要
Glycerol-water mixtures were studied at molar concentrations ranging from $x_\text{gly} = 1$ (pure glycerol) to $x_\text{gly}=0.3$ using shear mechanical spectroscopy. We observed a low frequency mode in neat glycerol, similar to what is usually reported for monohydroxy alcohols. This mode has no dielectric counterpart and disappears with increased water concentration. We propose that the hydrogen-bonded network formed between glycerol molecules is responsible for the observed slow mode and that water acts as a plasticizer for the overall dynamics and as a lubricant softening the hydrogen-bonding contribution to the macroscopic viscosity of this binary system.
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