[OAT‐CO2H‐2 n and OAT‐COPrg‐(2 n+1)] with an increasing number of primary amide (CONH) and triazole hydrogen‐bonding functionalities was prepared by an iterative synthetic procedure. It was found that their self‐assembly and thermoreversible gelation strength had a strong correlation to the number of hydrogen‐bonding moieties in the oligomers. There also existed a threshold value of the number of CONH units
一系列同源的寡酰胺(OAT)[ OAT-CO 2 H-2 n和OAT-
COPrg-(2 n +1)]通过迭代合成程序制备了数量越来越多的伯酰胺(CONH)和三唑氢键官能团。发现它们的自组装和热可逆胶凝强度与低聚物中氢键部分的数量密切相关。还存在CONH单元数的阈值,在该阈值之上,所有低聚物均成为有机胶凝剂。因此,CONH单元≤4的低聚物没有分子间氢键,也没有非有机凝胶化,而CONH单元> 4的低聚物则显示出分子间缔合和有机胶凝特性。对于有机胶凝剂,T凝胶值随CONH单位数的增加而单调增加。根据FTIR测量,CONH和三唑CH基团都参与了氢键过程。根据差示扫描量热法,发现由重量比为1:1的两种不同长度的两种低聚物(OAT-CO 2 H-6和OAT-CO 2 H-12)组成的混合干凝胶显示出微相分离。带有不同数量氢键键合单元的低聚物表现出自选作用,以最大化干凝胶状态下分子间氢键键合的程度。