摘要：首次利用剪切流下溶液黏度随时间的变化，对离子诱导胶束转变进行在线研究。在形态转变过程中，胶束结构的变化可通过黏度变化实时追踪。向PS144-b-PAA22在DMF/水混合溶剂中自组装形成的预制备球形胶束溶液加入HCl或CaCl2，胶束结构依次转变为短圆柱、长而缠结的圆柱以及片层或囊泡，对应黏度先升高后下降；向PS144-b-PAA50在二氧六环/水体系中形成的球形胶束溶液加入HCl或CaCl2时，胶束在流变测量前已快速转变为圆柱或片层，随后在剪切作用下转变为囊泡或球形，对应黏度逐渐下降。研究表明，流变是一种非常简单有效的在线研究胶束化过程的方法，有助于理解稀溶液中嵌段共聚物的胶束化机理和转变路径。

Abstract：The ion-induced micellar transition is online-investigated by the time dependence of the viscosity of the solution under shear flow for the first time. During the morphological transition, the change in the micellar structure can be tracked by the change in viscosity. Adding HCl or CaCl2 into a pre-prepared spherical micelle solution from the self-assembly of PS144-b-PAA22 in a DMF/water mixture, the micellar structures change into short cylinders, long entangled cylinders, and then lamellae or vesicles, corresponding to the viscosity increasing first and then declining. When HCl or CaCl2 is added to the pre-prepared spherical micelle solution formed by PS144-b-PAA50 in a dioxane/water mixture, the micellar structures are quickly transformed into cylinders or lamellae and then turned to vesicles or spheres under shearing, corresponding to a gradual decline in viscosity. This study shows that rheology can be a very simple and effective online method for investigating micellization and micellar transition pathways of block copolymers in dilute solution.

论文链接：https://doi.org/10.1021/la503835u