Coacervation of dynamic covalent surfactants with polyacrylamides: properties and applications
作者:Weiwei Zhao、Hua Wang、Yilin Wang
DOI:10.1039/c8sm00773j
日期:——
Dynamic covalent surfactants have been prepared from a mixture of 4-formyl-N,N,N-trimethylbenzenaminium iodide (FBA) with heptylamine (C7A) or octylamine (C8A) in alkaline aqueous solutions. The reversible pH-dependent nature of the imine bond is characterized by 1H NMR and fluorescence analysis. The dynamic covalent surfactants self-assemble into micelles under alkaline conditions and exhibit coacervation
由4-甲酰基-N,N,N-三甲基苯甲铵碘化物(FBA)与庚胺(C 7 A)或辛胺(C 8 A)在碱性水溶液中的混合物制备了动态共价表面活性剂。亚胺键具有可逆的pH依赖性,其特征是11 H NMR和荧光分析。动态共价表面活性剂在碱性条件下会自组装成胶束,并在很宽的浓度范围内与10%的水解聚丙烯酰胺(PAM)发生凝聚。发现具有网络结构的凝聚相可以有效地提取阴离子染料Conge Red(CR)。当将溶液调节至酸度时,亚胺键会水解,从而导致凝聚层过渡为均匀,澄清的溶液,并且由于磺酸基的质子化,CR沉淀为紫黑色固体。因此,利用该动态共价表面活性剂/ PAM系统实现了CR分子的提取和释放。此外,初始成分FBA,胺和PAM可以很容易地用盐酸再生。