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Monitoring Collapse of Uniform Cylindrical Brushes with a Thermoresponsive Corona in Water
ACS Macro Letters ( IF 5.8 ) Pub Date : 2018-01-10 00:00:00 , DOI: 10.1021/acsmacrolett.7b00991
Hang Zhou 1 , Yijie Lu 1 , Qing Yu 1 , Ian Manners 2 , Mitchell A Winnik 1
Affiliation  

We generated rod-like micelles of uniform length by living crystallization-driven self-assembly of a polyferrocenylsilane (PFS) block copolymer PFS26-b-POEGMA163 in a methanol–ethanol mixture and then transferred these micelles to water. The corona chains consisted of poly(oligoethylene glycol methacrylate) that had a lower critical solution temperature (LCST) of 40.5 °C in water. We used a combination of static (SLS) and dynamic (DLS) multiangle light scattering to determine the dimensions of these cylindrical brush micelles in solution. Measurements carried out in dilute solution in water over a series of temperatures from 23 to 50 °C showed that the collapse transition was broad and continuous, upon both heating and cooling. This response is different from the collapse transition of POEGMA163 homopolymer in water, which occurs over a very narrow temperature range. Thus, we show that the collapse transition of a cylindrical brush has important features in common with the collapse of a brush of thermoresponsive polymers on a planar surface.

中文翻译:

用热敏电晕监测均匀圆柱刷在水中的塌陷

我们通过聚二茂铁硅烷 (PFS) 嵌段共聚物 PFS 26 - b -POEGMA 163的活性结晶驱动自组装生成了长度均匀的棒状胶束在甲醇-乙醇混合物中,然后将这些胶束转移到水中。电晕链由在水中具有 40.5 °C 的较低临界溶解温度 (LCST) 的聚(低聚乙二醇甲基丙烯酸酯)组成。我们使用静态 (SLS) 和动态 (DLS) 多角度光散射的组合来确定这些圆柱形刷胶束在溶液中的尺寸。在 23 至 50 °C 的一系列温度下在水中的稀溶液中进行的测量表明,在加热和冷却时,塌陷转变是广泛且连续的。这个响应不同于 POEGMA 163的崩溃过渡均聚物在水中,发生在非常窄的温度范围内。因此,我们表明圆柱形刷的塌陷转变与平面表面上的热响应聚合物刷的塌陷具有共同的重要特征。
更新日期:2018-01-10
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