Reconfiguration and Reorganization of Bottlebrush Polymer Surfactants
Reconfiguration and Reorganization of Bottlebrush Polymer Surfactants
复制标题
洗瓶刷聚合物表面活性剂的重构和重组
DOI：
10.1002/ange.202200530
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发表时间：
2022
影响因子：
--
通讯作者：
Russell, T.P.
中科院分区：
文献类型：
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作者：
Seong, H.G.;Chen, Z.;Emrick, T.;Russell, T.P.
具有随机分布的亲水性和疏水性侧链的瓶刷状无规共聚物（BRCP）在液-液界面处被示出重新配置成富含亲水性和富含疏水性的构象以降低界面能。聚合度（NBB）和接枝在这些BRCPs的程度被发现影响表面覆盖率和组装动力学。界面张力的时间依赖性被描述为表征BRCP扩散、界面吸附和重组的两个指数弛豫函数之和。界面张力（γ）和光漂白后荧光恢复（FRAP）结果表明，分子量越大的BRCPs吸附到油水界面所需的时间越长，而界面重组所需的时间越短。总体而言，这项工作描述了BRCP组装在液-液界面的基本原理，与聚合物设计的影响，提高了对乳化，粘附和相关性能的理解，在流体和界面。
Bottlebrush random copolymers (BRCPs), having randomly distributed hydrophilic and hydrophobic side chains, are shown to reconfigure into hydrophilic‐rich and hydrophobic‐rich conformations at liquid–liquid interfaces to reduce interfacial energy. Both the degree of polymerization (NBB) and extent of grafting in these BRCPs were found to impact surface coverage and assembly kinetics. The time‐dependence of the interfacial tension is described as the sum of two exponential relaxation functions characterizing BRCP diffusion, interfacial adsorption, and reorganization. Interfacial tension (γ) and fluorescence recovery after photobleaching (FRAP) results showed that higher molecular weight BRCPs require longer time to adsorb to the water–oil interface, but less time for interfacial reorganization. Overall, this work describes fundamental principles of BRCP assembly at liquid–liquid interfaces, with implications pertaining to polymer design with enhanced understanding of emulsification, adhesion, and related properties in fluids and at interfaces.