β-/γ-环糊精与Gemini草酸酯季铵盐的相互作用

本文对新合成的双子草酸酯季铵盐表面活性剂以表面张力法测定了25～45℃范围内的临界胶束浓度(0.6698～0.6099mmol·L-1),并计算了胶束形成的相关热力学参数ΔGm0、ΔHm0、ΔSm0.对其与β-,γ-环糊精(β-,γ-CD)的包结作用进行了研究.β-环糊精与双子草酸酯季铵盐表面活性剂的主客体包结物包结比主要为2:1.实验结果表明,环糊精对双子草酸酯季铵盐的胶束化有显著影响.由于双子草酸酯季铵盐的水链被环糊精的空腔包裹,削弱了其胶束生成的能力,使溶液的表面张力随环糊精浓度的增加而大大增加.

Interaction between β-/γ- cyclodextrins and gemini oxalate quaternary ammonium

The critical micelle concentrations( cmc = 0. 6698 ～ 0. 6099 mmol. L~(-1) ) of the gemini oxalate quaternary ammonium surfactant (Gemini) were determined by the surface tension method at 25 ～45℃,and the thermodynamic parameters( △G~0、△H_m~0、 △S_m~0) of the micellization were evaluated. The inclusion action of β-,γ-CDs with Gemini surfactant in aqueous solution were investigated. The inclusion ratio of β-CD with Gemini mainly is 2:1. The experimental results indicate that β-, γ-CDs affect markedly the micellization of the gemini oxalate quaternary ammonium. The hydrophobic chain of the gemini oxalate quaternary ammonium were wrapped up by the cavum of β-, γ-CDs, thus the micellization of the gemini oxalate quaternary ammonium was weakened. The solution surface tension greatly increased with increasing concentration of β-,γ-CDs.