Chen Renxu, Zhu Shiping, Maclaughlin Shane
Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7.
Langmuir. 2008 Jun 1;24(13):6889-96. doi: 10.1021/la800171h. Epub 2008 May 29.
Acrylic polymers, including poly(methyl methacrylate), poly(2,2,2-trifluoroethyl methacrylate), poly( N,N'-dimethyaminoethyl methacrylate), and poly(2-hydroxyethyl methacrylate) were grafted from flat nickel and copper surfaces through surface-initiated atom transfer radical polymerization (ATRP). For the nickel system, there was a linear relationship between polymer layer thickness and monomer conversion or molecular weight of "free" polymers. The thickness of the polymer brush films was greater than 80 nm after 6 h of reaction time. The grafting density was estimated to be 0.40 chains/nm2. The "living" chain ends of grafted polymers were still active and initiated the growth of a second block of polymer. Block copolymer brushes with different block sequences were successfully prepared. The experimental surface chemical compositions as measured by X-ray photoelectron spectroscopy agreed very well with their theoretical values. Water contact angle measurements further confirmed the successful grafting of polymers from nickel and copper surfaces. The surface morphologies of all samples were studied by atomic force microscopy. This study provided a novel approach to prepare stable functional polymer coatings on reactive metal surfaces.
通过表面引发原子转移自由基聚合（ATRP），从平整的镍和铜表面接枝了包括聚（甲基丙烯酸甲酯）、聚（甲基丙烯酸2,2,2 - 三氟乙酯）、聚（甲基丙烯酸N,N'-二甲基氨基乙酯）和聚（甲基丙烯酸2 - 羟乙酯）在内的丙烯酸类聚合物。对于镍体系，聚合物层厚度与单体转化率或“游离”聚合物的分子量之间存在线性关系。反应6小时后，聚合物刷膜的厚度大于80纳米。接枝密度估计为0.40链/纳米²。接枝聚合物的“活性”链端仍然具有活性，并引发了第二嵌段聚合物的生长。成功制备了具有不同嵌段序列的嵌段共聚物刷。通过X射线光电子能谱测量的实验表面化学组成与其理论值非常吻合。水接触角测量进一步证实了聚合物在镍和铜表面的成功接枝。通过原子力显微镜研究了所有样品的表面形貌。该研究提供了一种在活性金属表面制备稳定功能聚合物涂层的新方法。
