Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.
ACS Appl Mater Interfaces. 2013 Apr 10;5(7):2485-94. doi: 10.1021/am302869d. Epub 2013 Mar 20.
We have investigated two different concepts to synthesize redox active polymer brushes using surface initiated atomic transfer radical polymerization (SI-ATRP). This polymerization technique allows the synthesis of well-defined grafted polymer brushes. In the initial step the surface was functionalized with a self-assembling monolayer of the SI-ATRP starter. Then, polymer brushes carrying phenothiazine moieties were grafted from the surface via SI-ATRP. The first concept consists of polymerizing monomers with phenothiazine pendant moieties to directly incorporate the redox functionality as side group in the growing polymer brush. The second concept consists of using grafted activated ester brushes which are functionalized with phenothiazine redox moieties in a successive reaction step. The electrochemical properties of the grafted redox active brushes were examined by cyclic voltammetry. Furthermore, the surface morphology and the chemical composition of the polymer brushes were characterized using scanning force microscopy (SFM), X-ray techniques, and UV/vis spectroscopy. Apart from their redox behavior, the synthesized brushes revealed increased mechanical stability on the nanoscale.
我们研究了两种不同的概念，以使用表面引发原子转移自由基聚合（SI-ATRP）合成氧化还原活性聚合物刷。这种聚合技术允许合成具有良好定义的接枝聚合物刷。在初始步骤中，表面通过自组装单分子层的 SI-ATRP 引发剂进行功能化。然后，通过 SI-ATRP 从表面接枝带有吩噻嗪部分的聚合物刷。第一个概念包括聚合带有吩噻嗪侧基的单体，以直接将氧化还原功能作为侧基引入到生长的聚合物刷中。第二个概念包括使用接枝的活性酯刷，这些刷在后续反应步骤中用吩噻嗪氧化还原部分进行功能化。通过循环伏安法研究了接枝氧化还原活性刷的电化学性质。此外，使用扫描力显微镜（SFM）、X 射线技术和 UV/vis 光谱法对聚合物刷的表面形态和化学组成进行了表征。除了它们的氧化还原行为外，合成的刷在纳米尺度上显示出增加的机械稳定性。
