PET‐RAFT Polymerization of Star Polymers with Folded ortho ‐Phenylene Cores
PET‐RAFT Polymerization of Star Polymers with Folded ortho ‐Phenylene Cores
复制标题
具有折叠邻位-亚苯基核的星形聚合物的 PET-RAFT 聚合
DOI：
10.1002/marc.202300094
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发表时间：
2023
影响因子：
4.6
通讯作者：
Konkolewicz, Dominik
中科院分区：
文献类型：
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作者：
Bradford, Kate G. E.;Kirinda, Viraj C.;Gordon, Emma A.;Hartley, C. Scott;Konkolewicz, Dominik
邻苯二烯是最简单的芳香族化合物之一，由于芳香族堆积作用而采用螺旋构型。邻苯二烯的折叠和错误折叠在室温或低于室温的核磁共振时间刻度上是缓慢的，从而允许使用1H核磁共振光谱来检测折叠状态。在此，邻苯二烯六聚体与每个重复单元上的RAFT链转移剂(CTA)偶联。利用PET-RAFT将各种丙烯酸酯单体聚合到CTA功能化的邻苯二烯上，得到了具有邻苯撑核的官能化星形聚合物。丙烯酸酯单体单元的空间体积以及星形聚合物每一臂的链长是不同的。1H核磁共振谱表明邻苯二烯的折叠没有变化，为星形聚合物体系提供了一个坚固的螺旋核心。
ortho‐Phenylenes are one of the simplest classes of aromatic foldamers, adopting helical geometries because of aromatic stacking interactions. The folding and misfolding ofortho‐phenylenes are slow on the NMR timescale at or below room temperature, allowing detection of folding states using1H NMR spectroscopy. Herein, anortho‐phenylene hexamer is coupled with a RAFT chain transfer agent (CTA) on each repeat unit. A variety of acrylic monomers are polymerized onto the CTA‐functionalizedortho‐phenylene using PET‐RAFT to yield functionalized star polymers withortho‐phenylene cores. The steric bulk of the acrylate monomer units as well as the chain length of each arm of the star polymer is varied.1H NMR spectroscopy shows that the folding of theortho‐phenylenes do not vary, providing a robust helical core for star polymer systems.