Synthesis and Properties of pH‐Dependent Gemini Surfactants Containing Multiple Carboxyl Groups
作者:Longyin Qiao、Wanjing Zhang、Libo Xu、Fu Han、Yawen Zhou、Baocai Xu
DOI:10.1002/jsde.12390
日期:2020.3
corresponding monomeric surfactants (single head group, single‐chain), especially DTPDT‐14, whose cmc can reach 2.29 × 10−5 mol/L. With an increase in the length of the alkyl chain, the solubility of the surfactants decreases and the surface tension of the three surfactants at cmc increases. In consideration of pH, all of three surfactants appear better emulsifying capacity and foaming property under weak
合成了一系列双子座表面活性剂N,N''-二烷基-N,N',N''-三丙酸二亚乙基三胺(称为DTPDT-n,其中n是烃链的长度,n = 10、12、14 ),具有三个羧基头基和两个疏水性烷烃链。产物通过核磁共振和质谱法表征。研究了具有不同烃链长度的DTPDT-n表面活性剂的物理化学性质,如等电点,表面活性,乳化性质和泡沫性质。结果表明,这些化合物表现出pH依赖性的质子脱质子行为。DTPDT-n表面活性剂的等电点在3.40和10.90之间。临界胶束浓度(cmc)所有三种表面活性剂均低于相应的单体表面活性剂(单头基团,单链),尤其是DTPDT-14,其cmc可以达到2.29×10 -5 mol / L。随着烷基链长度的增加,表面活性剂的溶解度降低,并且三种表面活性剂在cmc下的表面张力增加。考虑到pH,三种表面活性剂在弱碱性条件下均表现出更好的乳化能力和发泡性能。DTPDT-14在三种表面活性剂