叔胺基CO2开关表面活性剂的合成及性能研究

以不同碳链长度的脂肪酸(n=12,14和16)和N,N-二甲基-1,3-丙二胺为原料合成了系列长链脂肪酰胺叔胺C_nAMPM。通过核磁共振氢谱和电导率实验证实了其CO_2开关响应性能。研究发现:通入CO_2后,CnAMPM表现出表面活性剂特征,随着碳链长度增加,cmc线性降低,发泡性能、乳化正庚烷的能力和在标准帆布上的润湿性能也相应下降。通入N_2后,发泡力大幅度降低;C_(12)AMPM的乳化性能较好,润湿性能好于另外2种;而C_(14)AMPM和C_(16)AMPM的乳化能力和润湿能力均较差。

Synthesis and performance of tertiary amine-based CO2 switchable surfactant

A series of long-chain fatty amido tertiary amine-based CO2 switchable surfactant N-(3-(dimethyl amino) propyl) alkyl amide (CnAMPM, n=12, 14 and 16) was synthesized with fatty acids separately and N,N-dimethyl-1,3-propanediamine as starting materials. Its performance was verified to be CO2-responsive via 1H NMR spectra and conductivity measurement. Results showed that, CnAMPM display as cationic surfactants after bubbling CO2. With increasing the length of hydrophobic group, their critical micellar concentration (cmc) decreases linearly and foaming power, emulsifying power as well as wetting power all decrease. As CO2 is replaced with N2, the foaming power of CnAMPM decreases to a great extent. For C12AMPM the emulsifying power keeps unchanged, while the wetting power is better than that of C14AMPM and C16AMPM. C14AMPM and C16AMPM display poor emulsifying power and wetting power.