CAJ | 학술논문

利用稳态和频率扫描研究了十六烷基硫酸钠(SHS)与Bola盐(N,N'-双乙基二甲基-α,ω-乙烷溴化铵(Bola2Et)或N,N'-三甲基-α,ω-丁烷溴化铵(Bola4)混合体系的流变行为.实验结果表明两个体系均在45℃时形成了长蠕虫胶束,溶液呈现出高粘弹性,尤其是SHS/Bola2Et溶液表现出很高的弹性,零剪接粘度高达2520 Pa·s,表观上呈现胶状.这些结果归因于在Bola反离子诱导下,表面活性剂SHS与Bola反离子形成了静电吸引的2:1结构复合物.由于这两个Bola反离子的联接链长度均短于季铵离子的静电平衡距离,因此形成的复合物在形状上有利于蠕虫胶束生成.作为对比,添加简单的四甲基铵反离子无法诱导SHS形成蠕虫胶束,溶液仅呈现低粘度.
이용은태화빈솔소묘연구료십륙완기류산납(SHS)여Bola염(N,N'-쌍을기이갑기-α,ω-을완추화안(Bola2Et)혹N,N'-삼갑기-α,ω-정완추화안(Bola4)혼합체계적류변행위.실험결과표명량개체계균재45℃시형성료장연충효속,용액정현출고점탄성,우기시SHS/Bola2Et용액표현출흔고적탄성,령전접점도고체2520 Pa·s,표관상정현효상.저사결과귀인우재Bola반리자유도하,표면활성제SHS여Bola반리자형성료정전흡인적2:1결구복합물.유우저량개Bola반리자적련접련장도균단우계안리자적정전평형거리,인차형성적복합물재형상상유리우연충효속생성.작위대비,첨가간단적사갑기안반리자무법유도SHS형성연충효속,용액부정현저점도.
The rheological behaviors of mixed aqueous solutions of sodium hexadecyl sulfate (SHS) and a bolaform salt,either N,N'-ethanediyl-α,ω-bis(ethyldimethylammonium bromide) (Bola2Et) or N,N'-propanediyl-α,ω-bis(trimethylammonium bromide) (Bola4),were investigated by steady-state and frequencysweep measurements.The results showed that long worm-like micelles were formed in both systems at 45 ℃,and the solutions exhibited high viscoelasticities,especially the SHS/Bola2Et system in which the solution had very high elasticity.The zero-shear viscosity of SHS/Bola2Et was as high as 2520 Pa· s,and the system was gel-like.These results were attributed to the formation of 2:1 complexes by electrostatic attraction.Since the spacers of both Bola counterions were shorter than the distance between quaternary ammonium ions under electrostatic equilibrium,the generated complex in shape favored formation of worm-like micelles.In comparison,it was difficult to induce SHS to form worm-like micelles by the addition of tetramethylammonium counterions,and the solution exhibited low viscosity.