摘要
采用衣康酸酐、月桂醇、1,4-丁二醇、亚硫酸氢钠为主要原料,依次经单酯化、磺化、双酯化反应,合成了一种新颖的双子表面活性剂——1,4-丁二醇双衣康酸月桂醇双酯磺酸钠(Gemini-12),并通过正交试验对双酯化合成条件进行了优化。较佳工艺条件如下:双酯化反应温度150℃,反应时间6.0h,衣康酸单月桂醇酯磺酸钠与1,4-丁二醇的摩尔比为2.30∶1.00,催化剂用量为物料总量的1.0%(质量分数)。通过FTIR和~1H NMR对中间产物和Gemini-12的结构进行了确认,并对终产物的物化性能进行了初步表征,测得其临界胶束浓度(CMC)为1.38×10^(–3)mol/L,表面张力γCMC为28.60m N/m,效率因子pC_(20)为3.14,表面活性剂的效能CMC/C_(20)为1.91,表面过剩量ΓCMC为1.15mmol/m^2,极限分子面积ACMC为1.44×10^(–3)nm^2/mol,标准胶束自由能ΔGmic?为–9.018kJ/mol,标准吸附自由能ΔGads?为–31.22 kJ/mol。随NaCl浓度的增加,Gemini-12的CMC值不断降低。
A new type of Gemini surfactant(Gemini-12)was synthesized with cheap materials such as itaconic anhydride(IAn),lauryl alcohol,1,4-butanediol and sodium bisulfite by themonoesterification,sulfonation and diesterification reaction processes.The optimal reaction conditions of the diesterification obtained via orthogonal experiments were:ratio of sodium lauryl sulfoitaconic monoester to1,4-butanediol=2.30∶1.00,and1.0%p-methyl benzenesulfonic acid at150℃for6.0h.The structures of intermediate products and Gemini-12were confirmed by FTIR and1H NMR.Finally,the primary physico-chemical properties of Gemini-12were characterized.The critical micelle concentration(CMC)was1.38×10-3mol/L,and the surface tension at CMC was28.60mN/m;the efficient factor pC20was3.14;CMC/C20was1.91;the saturation adsorptionΓCMC was1.15mmol/m2;the area per molecule at interface was1.44×10-3nm2/mole;the standard free energy of micellization was-9.018kJ/mol and the standard free energy of adsorption was-31.22kJ/mol.The CMC of Gemini-12decreased with the increase of the concentration of NaCl solution.
作者
李盼
徐红
解鸿宇
张欢欢
杜蕾
许军
LI Pan;XU Hong;XIE Hongyu;ZHANG Huanhuan;DU Lei;XU Jun(Chemical Engineering College,Qingdao University of Science & Technology,Qingdao 266042,Shandong,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第8期3047-3052,共6页
Chemical Industry and Engineering Progress
基金
山东省自然科学基金项目(ZR2011BM006)
关键词
衣康酸酐
月桂醇
磺化
酯化
表面活性剂
合成
itaconic anhydride
lauryl alcohol
sulfonation
esterification
surfactants
synthesis
