含密胺基团新型酰胺类凝胶因子的合成、性能及Hansen溶度参数对凝胶行为的预估  

Synthesis and Gel Properties of a Novel Amide Gelator with Melamine Moieties and Rationalizing Gelation Behavior by Hansen Solubility Parameters

作　　者：王潇[1] 杨新国[1] 沈启立[1] WANG Xiao YANG Xinguo SHEN Qili(College of Materials Science ＆ Engineering, Hunan Province Key Laboratory for Spray Deposition Technology ＆ Application, Hunan University, Changsha 410082, China)

机构地区：[1]湖南大学材料科学与工程学院湖南省喷射沉积技术及应用重点实验室,长沙410082

出　　处：《高等学校化学学报》2016年第11期2068-2075,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50573019;51273061);湖南省自然科学基金(批准号:2016JJ2027)资助~~

摘　　要：设计合成了一种含有密胺基团的新型酰胺类凝胶因子AMOG,其在多种常用有机溶剂中均能形成凝胶,且在甲苯和二甲苯中形成凝胶的临界凝胶浓度(CGC)约为1 mmol/L.采用"试管倒转法"确定了凝胶的溶剂-凝胶转变温度(Tgel),利用SEM表征了凝胶的微观结构,发现AMOG具有明显的溶剂效应.运用溶剂的Hansen溶度参数探索溶剂对凝胶行为的作用机制,发现溶剂的氢键作用参数(δh)对凝胶的微观结构和凝胶性质有显著影响:AMOG在1.0 MPa^(1/2)<δh<4.1 MPa^(1/2)的溶剂中形成透明凝胶,在4.1 MPa^(1/2)<δh<8.0MPa^(1/2)的溶剂中为不透明凝胶,在δh>8.0 MPa^(1/2)的溶剂中为沉淀或溶液状态.进一步将溶剂的Hansen溶度参数以三维坐标(δ_d,δ_p和δ_h)表示,发现能使AMOG形成凝胶的溶剂主要集中在Hansen空间的特定区域内.实验结果表明,凝胶体系的溶液-凝胶转变温度主要受色散参数δ_d与极性参数δ_p的影响,氢键参数δh对其有微调的作用.A novel amide gelator with melamine moieties（ AMOG） was designed and synthesized. Gelator AMOG is capable of forming gel in various common organic solvents and the critical gelation concentration（ CGC） of the gels formed in toluene and xylene are as low as 1 mmol/L. Tube inversion method is adopted to define the sol-gel transition temperature（ Tgel） and the scanning electron microscope（ SEM） is used to investigate micro-morphology of gels. The results of these tests exhibit obvious solvent effect on gelation behavior of AMOG. Further investigation for gelation behavior based on Hansen solubility parameters（ HSPs） of solvents reveals that hydrogen bonding parameter（ δh） has significant influence on the micro-morphology and properties of gels. 1. 0 MPa1/2〈δh〈4. 1 MPa1/2 for organic solvents is the favorable domain for transparent gels formation,opaque gels occur in the range of 4. 1 MPa1/2〈δh〈8. 0 MPa1/2 and solution / precipitation remain if δhis larger than 8. 0 MPa1/2. HSPs values for tested solvents are plotted as a point in Hansen space,which is constructed with δd,δpand δhas its three-dimensional coordinates. Most of the solvents that could form gels cluster in a certain region in above Hansen space. Sol-gel transition temperature is related to parameter δdand δp.

关 键 词：有机凝胶 酰胺 密胺 Hansen溶度参数 溶剂效应 

分 类 号：O648.17[理学—物理化学]