新型磺酸盐型Gemini表面活性剂的合成及其与聚合物相互作用

Study on Synthesis of Sulfonate Gemini Surfactants and Interaction with Polyacrylamide

以溴代正烷烃、乙二胺、1,3-丙磺内酯合成了一系列新型磺酸盐型Gemini表面活性剂(SGS-8、SGS-10、SGS-12、SGS-14);采用IR、1H NMR及元素分析等手段对合成产物进行结构表征,并研究了其表面活性,采用等温滴定微量热技术、表面张力法和稳态荧光光谱法研究了SGS-12与聚丙烯酰胺(PAM)的相互作用规律及热力学参数。结果表明,合成的产物纯度较高,具有较低的cmc值和较好的表面活性;SGS-12/PAM混合体系的表面张力曲线和芘探针在体系中微极性的变化表明,二者发生相互作用且形成混合胶束;SGS-12与PAM结合是一个由焓驱动的自发过程,△H和△S均小于0,表明相互作用力以氢键和范德华力为主,合成产物在聚丙烯酰胺分子上的平均结合数为287。

The series of sulfonate Gemini surfactants （SGSs） were synthesized from bromo-alkane, ethylenediamine and 1,3-propanesulfonate. Their chemical structures were confirmed by IR, I H NMR and elemental analysis. The interaction and thermodynamic parameters of SGS-12 with polyacrylamide （PAM） were studied by isothermal titration microcalorimetry （ITC） , surface tension and steady-state fluorescence spectrometry. The results showed that the synthesiged-SGSs have higher surface activity with lower cmc values and surface tensions. The mixed micelle was formed through mixing of SGS-12 and PAM, and the combination of them was a spontaneous process droved by enthalpy, △ H 〈 0 and △ S 〈 0 indicated that the main interaction between them were hydrogen bonds and Van der Waals forces. The average binding number of SGSs on the PAM molecule was 287.