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首页> 外文期刊>Journal of Applied Polymer Science >Copper (I) ion stabilized on Fe3O4-core ethylated branched polyethyleneimine-shell as magnetically recyclable catalyst for ATRP reaction
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Copper (I) ion stabilized on Fe3O4-core ethylated branched polyethyleneimine-shell as magnetically recyclable catalyst for ATRP reaction

机译：稳定在Fe3O4芯乙基化支化聚乙烯亚胺-壳上的铜（I）离子可作ATRP反应的可磁循环催化剂

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Branched polyethyleneimine (bPEI) was used to modify the surface of Fe3O4 nanoparticles coated with silica layer, and then, it was treated with ethyl iodide to prepare Fe3O4@SiO2@Ethylated-bPEI. In the next step, the yolk-shell structure was gained by selectively etching the SiO2 middle layer. Finally, copper(I) was introduced to the yolk-shell Fe3O4@Ethylated-bPEI and the activity of the catalyst was evaluated for atom transfer radical polymerization (ATRP) of styrene, led to obtain the well-defined polymer with relatively low polydispersity. The toxicity of the residual copper in the polymer product was a limiting issue for applicability of ATRP reactions especially for biological purposes. In this report, the copper content in the polymer was reduced to the excellent value of 1.1 ppm. Moreover, the magnetic isolation, recyclability, and remove the need for an external ligand were other advantages of the synthesized catalyst which makes it suitable for employing in ATRP reactions. (C) 2015 Wiley Periodicals, Inc.
机译：用支链聚乙烯亚胺（bPEI）修饰二氧化硅层包覆的Fe3O4纳米颗粒的表面，然后用碘乙烷处理，制备Fe3O4 @ SiO2 @乙氧基化bPEI。在下一步中，通过选择性刻蚀SiO2中间层获得卵黄壳结构。最后，将铜（I）引入到蛋黄壳型Fe3O4 @ Ethylated-bPEI中，并评估了催化剂的活性以进行苯乙烯的原子转移自由基聚合（ATRP），从而获得了具有较低多分散性的良好聚合物。聚合物产物中残留铜的毒性是ATRP反应适用性的一个限制问题，特别是出于生物学目的。在该报告中，聚合物中的铜含量降低到1.1 ppm的优异值。此外，磁性隔离，可回收利用性以及无需外部配体是合成催化剂的其他优点，这使其适用于ATRP反应。 （C）2015年Wiley Periodicals，Inc.

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