Substrate-Independent Approach to Dense Cleavable Polymer Brushes by Nitroxide-Mediated Polymerization,ACS Macro Letters

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Substrate-Independent Approach to Dense Cleavable Polymer Brushes by Nitroxide-Mediated Polymerization
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-12-29 00:00:00 , DOI: 10.1021/acsmacrolett.7b00979
Wei Wei ₁ , A Balamurugan ₁ , Jonathan H Dwyer ₁ , Padma Gopalan _{1,

2}

Affiliation

High grafting density polymer brushes are grown on an inimer coating bearing nitroxide-mediated polymerization (NMP) inimers and glycidyl methacrylate (GMA). The inimer coating is cross-linked on the substrate to provide an initiator layer with needed stability during long exposure to organic solvents at moderate to high temperatures. Surface-initiated nitroxide-mediated polymerization (SI-NMP) is conducted to grow polystyrene (PS) brushes on the coating with a sacrificial layer designed to cleave the brushes. The cleaved brushes have larger molecular weights than the corresponding free polymers. The grafting density of the brushes is as high as 1.12 chains/nm² throughout the brush growth, which is among the densest PS brushes reported so far. Atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) depth profiling are used to reveal the surface morphology and kinetics of the growth.

中文翻译：

氮氧化物介导聚合致密可裂解聚合物刷的不依赖底物的方法

高接枝密度聚合物刷在带有氮氧化物介导聚合 (NMP) 异构体和甲基丙烯酸缩水甘油酯 (GMA) 的异构体涂层上生长。异构体涂层在基材上交联以提供引发剂层，该引发剂层在中至高温下长时间暴露于有机溶剂期间具有所需的稳定性。进行表面引发的氮氧化物介导的聚合 (SI-NMP) 以在涂层上生长聚苯乙烯 (PS) 刷子，其中牺牲层设计用于切割刷子。裂开的刷子具有比相应的游离聚合物更大的分子量。刷子接枝密度高达1.12链/nm ²在整个画笔生长过程中，这是迄今为止报道的最密集的 PS 画笔之一。原子力显微镜 (AFM) 和 X 射线光电子能谱 (XPS) 深度剖析用于揭示表面形态和生长动力学。

更新日期：2017-12-29

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