The influence of replacing water with isopropanol (IP) on the rheological properties of aqueous solutions containing wormlike micelles (WLMs) prepared by mixing cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal) at 25 °C was investigated. Viscosity of CTAB aqueous solutions exhibits two maxima and one minimum with increasing amounts of NaSal, consisting of entangled WLMs. When water is replaced by increasing amount of IP, the viscosity maxima and the minimum changes drastically. The elastic plateau modulus G° of these solutions remains almost the same with increasing IP contents (up to ∼5 wt%), whereas their relaxation time changes drastically. Critical micelle concentration (CMC) of CTAB has increased with further IP addition, indicating an increase in the micellar hydrophilicity. For WLMs at minimum viscosity, increasing addition of IP (>5.0 %) to WLMs at maximum and minimum viscosities, leads to a drastic decrease in the elastic modulus G°, indicating the formation of smaller micellar aggregates. The influence of IP as a co-solvent on the WLMs rheological properties is also compared to that of glycerol and 1,3 butanediol (1,3 BD) for the same NaSal/CTAB viscoelastic system.

中文翻译：

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异丙醇对蠕虫状胶束流变行为的影响

研究了用异丙醇 (IP) 代替水对十六烷基三甲基溴化铵 (CTAB) 和水杨酸钠 (NaSal) 在 25 °C 下混合制备的含有蠕虫状胶束 (WLM) 的水溶液流变性质的影响。随着 NaSal 量的增加，CTAB 水溶液的粘度表现出两个最大值和一个最小值，由缠结的 WLM 组成。当水被越来越多的 IP 取代时，粘度最大值和最小值会发生剧烈变化。弹性平台模量G随着 IP 含量的增加（高达 ∼5 wt%），这些溶液的 ° 几乎保持不变，而它们的弛豫时间却发生了巨大的变化。CTAB 的临界胶束浓度 (CMC) 随着 IP 的进一步添加而增加，表明胶束亲水性增加。对于最低粘度的 WLM，在最大和最小粘度的 WLM 中增加 IP (>5.0 %) 的添加量会导致弹性模量急剧下降G°，表明形成了更小的胶束聚集体。对于相同的 NaSal/CTAB 粘弹性系统，IP 作为共溶剂对 WLM 流变特性的影响也与甘油和 1,3 丁二醇 (1,3 BD) 的影响进行了比较。