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Nitroxide-mediated radical polymerization of N-ethyl-2-vinylcarbazole

机译：一氧化氮介导的N-乙基-2-乙烯基咔唑的自由基聚合

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摘要

The hole-transporting ability of carbazole-containing polymers makes them attractive for applications in organic electronics. Nitroxide-mediated radical polymerization (NMRP) offers the potential to create complex macromolecular architectures, including block copolymers, but N-vinylcarbazole, the simplest and most widely studied carbazole monomer, is known to polymerize poorly by NMRP. Here, we investigate the NMRP of N-ethyl-2-vinylcarbazole (2 VK), a monomer structurally more similar to the styrenes which are known to polymerize well by NMRP, and whose polymer offers a hole mobility an order of magnitude higher than poly(N-vinylcarbazole). Polymerization of 2 VK from a unimolecular alkoxyamine shows a molecular weight which increases steadily with time, though termination or decomposition of the "living" radical ends is clearly evident from the progressive formation of a low-molecular-weight tail as conversion increases. However, a sufficient fraction of the chains remain living that P2VK-PS diblock copolymer can be formed by chain extension of the P2VK macroinitiator with styrene.
机译：含咔唑的聚合物的空穴传输能力使其在有机电子产品中具有吸引力。一氧化氮介导的自由基聚合（NMRP）提供了创建复杂的大分子结构（包括嵌段共聚物）的潜力，但已知最简单，研究最广泛的咔唑单体N-乙烯基咔唑的NMRP聚合效果较差。在这里，我们研究了N-乙基-2-乙烯基咔唑（2 VK）的NMRP，该单体在结构上与已知通过NMRP很好聚合的苯乙烯相似，并且其空穴迁移率比聚苯乙烯高一个数量级。 （N-乙烯基咔唑）。来自单分子烷氧基胺的2 VK的聚合显示分子量随时间稳定增加，尽管随着转化率的增加，低分子量尾部的逐步形成显然使“活性”自由基末端终止或分解。但是，有足够比例的链保留下来，可以通过P2VK大分子引发剂与苯乙烯的扩链来形成P2V​​K-PS二嵌段共聚物。

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