混合水和酒精的特殊溶解效应通过分子聚合揭示出来
Linghao Meng1, Rong Wei1, Zhaoxin Xie1
1Beijing National Laboratory for Molecular Sciences, Centre for the Soft Matter Science and Engineering, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry, Peking University Beijing 100871 China dizhang@pku.edu.cn gaoyq@pku.edu.cn dhzhao@pku.edu.cn.
水-酒精混合物意外地改变了分子聚合,形成较小的H-聚合物而不是J-聚合物. 这种增强的溶解效应取决于酒精结构,影响超分子组合.
科学领域:
- 超分子化学 超分子化学
- 物理化学 物理化学
- 材料科学是一种材料科学.
背景情况:
- 酒精是水中的多功能共同溶剂,用于超分子组装,因为它们的绿色性质,混合性和可调节的极性.
- 水/酒精混合物表现出复杂的溶解特性,这些特性取决于成分.
- 了解这些溶解效应对于控制分子自我组装至关重要.
研究的目的:
- 为了阐明水/酒精混合物的异常溶解效应.
- 研究混合溶剂对两性分子聚合行为的影响.
- 为了将溶剂结构与分子聚合变化相关联.
主要方法:
- 在纯水,纯酒精和水-酒精混合物中研究了带极侧链的两多环的聚合动图.
- 观察到聚合物形态的变化 (J-聚合物与H-聚合物).
- 利用分子动力学模拟来支持实验发现.
主要成果:
- 在纯水和酒精中形成纤维状J-聚合物,但在水-酒精混合物中形成较小的H-聚合物.
- 聚合物解离和H/J切换发生在不同的体积比,取决于酒精的结构.
- 低碳酒精水系统表现出类似的解离趋势,受酒精基链长度和水化结构的影响.
结论:
- 与纯溶剂相比,水-酒精混合物对两性分子具有增强的溶解能力.
- 水-酒精二元系统的微观结构,特别是结构化网络和水化,决定了它们的溶解能力.
- 酒精含有较长的基团更有效地破坏分子聚合,因为它们具有较大的结构化水化.
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