一种具有二维状组装体结构的氢键结合超分子水凝胶的制备  

PREPARATION OF A HYDROGEN BONDED SUPRAMOLECULAR HYDROGELS WITH TWO DIMENSIONAL AGGREGATE STRUCTURE

作　　者：吴吉炜[1] 唐黎明[1] 陈凯[1] 李斐[1] 燕良[1] 王毓江[1] 

机构地区：[1]清华大学化工系教育部先进材料重点实验室,北京100084

出　　处：《高分子学报》2007年第4期397-400,共4页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号20574041)资助项目

摘　　要：A new hydrogelator,2,6-di[N-(carboxypropylcarbonyl)amino] pyridine (defined as DPAP) was synthesized from 2,6-diaminopyridine and glutaric anhydride by a one-step procedure.Self-supporting supramolecular hyrogels were formed through cooling DPAP aqueous solution and DPAP mixed solution of 1,4-dioxane and water with 1,4-dioxane content no more than 15 wt%.However,only fiber-like crystals were obtained in pure 1,4-dioxane system.SEM observation of the xerogels indicated that the gelator molecules assembled into large sized sheet-like aggregates.The powder XRD diagrams indicated that the xerogel samples possess onset diffraction at 5.6°(2θ),corresponding to a d spacing of 1.580 nm.Such a length corresponded well with DPAP molecular length of 1.895 nm if considering the aggregating chain tilting with respect to the normal to the layer plane.So the hydrogen bonded molecular chain direction represents the main aggregating direction.Meanwhile,the xerogel samples have another preferred diffraction at 16.64°(2θ) due to the preferred arrangement of molecules under the help of hydrophobic association,therefore resulting in two-dimensional aggregating structure.A new hydrogelator, 2, 6-di [N-（ synthesized from 2,6-diaminopyridine and carboxypropylcarbonyl） amino] pyridine （defined as DPAP） was glutaric anhydride by a one-step procedure. Self-supporting supramolecular hyrogels were formed through cooling DPAP aqueous solution and DPAP mixed solution of 1,4- dioxane and water with 1,4-dioxane content no more than 15 wt%. However, only fiber-like crystals were obtained in pure 1,4-dioxane system. SEM observation of the xerogels indicated that the gelator molecules assembled into large sized sheet-like aggregates. The powder XRD diagrams indicated that the xerogel samples possess onset diffraction at 5.6°（2θ） ,corresponding to a d spacing of 1.580 nm. Such a length corresponded well with DPAP molecular length of 1. 895 nm if considering the aggregating chain tilting with respect to the normal to the layer plane. So the hydrogen bonded molecular chain direction represents the main aggregating direction. Meanwhile, the xerogel samples have another preferred diffraction at 16.64°（2θ） due to the preferred arrangement of molecules under the help of hydrophobic association, therefore resulting in two-dimensional aggregating structure.

关 键 词：超分子水凝胶 氢键 片状结构 聚集体 

分 类 号：O648.17[理学—物理化学]