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用稳态和动态流变学方法研究了3-十六烷氧基-2-羟丙基三甲基溴化铵(R16HTAB)单纯以及水杨酸钠(NaSal)存在下溶液的流变特性.无盐体系中,在测定的浓度范围内,表面活性剂与零剪切黏度呈指数关系(0∝c2.53).水杨酸钠的加入促进了体系由球状向蠕虫状胶束转化.Cox-Merz规则和Cole-Cole图证明,混合体系生成了蠕虫状胶束.与传统的CTAB比较,无论水杨酸钠存在与否,R16HTAB水溶液的流变性能均较好,这主要归因于羟丙基基团的插入,使得R16HTAB和NaSal分子之间形成氢键连接,生成了更加稳定的三维网络结构.应用冷冻蚀刻电子显微镜技术进一步证实了体系中蠕虫状胶束的存在.
The rheological properties of 3-hexadecyloxy-2-hydroxypropyltrimonium bromide (R16HTAB) and sodium salicylate (NaSal) solutions were studied by steady-state and dynamic rheological methods. In the salt-free system, the surfactant has an exponential relationship with the zero-shear viscosity (0αc2.53) within the measured concentration range. The addition of sodium salicylate promotes the transformation from globular wormlike micelles to Cox -Merz rule and Cole-Cole diagram showed that the mixed system produced worm-like micelles.Compared with the traditional CTAB, the rheological properties of R16HTAB aqueous solution were better whether sodium salicylate was present or not, which was mainly attributed to hydroxyl The insertion of the propyl group led to the formation of hydrogen bond between R16HTAB and NaSal molecules, resulting in a more stable three-dimensional network structure. The existence of wormlike micelles was further confirmed by cryo-etching electron microscopy.