竞争的超分子结构:在糖醇/醇混合物上的介电和学光谱学
1Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, Roskilde, Denmark and Institute of Material Physics in Space, German Aerospace Center, 51170 Cologne, Germany.
甘油/醇混合物由于结结构而表现出复杂的动态. 介电和风学分析显示了两个不同的玻璃过渡,表明这些酒精混合物的显著动态异质性.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
背景情况:
- 用结合的系统,特别是酒精,形成过渡的超分子结构,如链条,环和网络.
- 了解这些结构的动态对于材料科学和物理化学至关重要.
- 之前的研究分析了灵敏度的光谱形状,以了解纯结系统.
研究的目的:
- 为了研究糖/醇混合物的联合介电和剪切学光谱形状.
- 将纯酒精动力学研究的概念应用于混合物.
- 为了了解糖中较高的基群数量如何影响混合动力学,与醇相比.
主要方法:
- 结合介电光谱学和剪切复合学.
- 分析各种易受性的光谱形状.
- 热量测量测量以确定融和玻璃过渡温度.
主要成果:
- 甘油/醇混合物显示了两种不同的热量计玻璃过渡,在糖度为 χgly = 0.3.3 的摩尔甘油度.
- 剪切模量 (G∞) 的变化发生在 χgly = 0.5 和 0.7.7 之间.
- 介电光谱检测超分子结构的演变,而机械特性则取决于键网络.
结论:
- 甘油/醇混合物表现出强烈的动态异质性,由两个可区分的玻璃过渡证明.
- 机械性能受到形成的联网的严重影响.
- 这些混合物在动态上比水/甘油混合物更异质.
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