基于脲基氢键组装的功能超分子凝胶  

Functional Supramolecular Gels Self-Assembled by Hydrogen Bonding Among Urea-Based Gelators

作　　者：王赛[1,2] 吴斌[1] 段军飞[1] 方江邻[2] 谌东中[1] 

机构地区：[1]南京大学化学化工学院高分子科学与工程系介观化学教育部重点实验室,南京210093 [2]南京大学现代分析中心,南京210093

出　　处：《化学进展》2014年第1期125-139,共15页Progress in Chemistry

基　　金：国家自然科学基金项目(No.20874044);江苏省基础研究计划项目(No.BK2010244)资助~~

摘　　要：有机小分子化合物在分子间氢键、π-π堆积、亲疏水作用、范德华力等非共价键弱相互作用力驱动下,自组装形成三维网络结构的物理凝胶称为超分子凝胶。含有脲基的凝胶因子由于其强氢键缔合能力以及与阴离子、金属离子、卤素化合物等作用的可调变多样性,成为组装超分子凝胶中特别有效的氢键组装单元。本文分别从单脲基、双脲基和多脲基的凝胶因子分类综述了基于脲基氢键组装的功能超分子凝胶的研究工作,特别是近几年来的重要进展。对一些成功例子,从分子设计及成胶操作条件控制等方面的精细调谐如何解决聚集-溶解这对主要矛盾,从而实现溶胶-凝胶的转化及其可能的应用前景进行了评述。本文展望了该领域的发展方向与趋势,指出超分子凝胶研究经过多年的快速发展,深化对其蕴含机制以及动力学过程的认识与调控以实现具有多种刺激响应、多重信号输出的多组分复合功能凝胶体系的加工制备是发展趋势与必然要求,展现出广泛的应用前景也极富挑战性。Supramolecular gels with various ordered structures are constructed by the self-assembly of lowmolecular-w eight gelators（ LMWGs） in some solvents driven by non-covalent interactions such as hydrogen bonding,π-π interactions,hydrophobic effects,and van der Waals interactions. Urea derivatives are among the most effective gelators for self-assembling supramolecular gels due to their strong hydrogen-bonding capability and various interactions and responsiveness to anion,metal cation and halide. In this paper,some representative research w orks especially the recent progress on functional supramolecular gels constructed from urea-based gelators are review ed according to mono-,bisand multi-urea systems. Furthermore,brief comments are made on their reversible sol-gel transformation and possible applications for some typical cases from the view point of finely tuning the dissolution-aggregation balance mainly based on molecular design of gelators and the optimization of their gelation conditions. Finally,the research trends and application perspectives of supramolecular gels are concisely expected and point out that after many years rapid development in this field, the clear understanding of gelation kinetics and the mechanism involved are the imperative and challenging w ork, and multi-component supramolecular gels w ith complex internal structures and controllable physical properties show ing fast response to variant external stimuli may constitute the new generation of functional gels.

关 键 词：超分子凝胶 功能凝胶 刺激响应性 脲基凝胶因子 氢键 自组装 

分 类 号：O631[理学—高分子化学] O641.3[理学—化学]