Access to Multiblock Copolymers via Supramolecular Host鈥揋uest Chemistry and Photochemical Ligation

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• 作者：Astrid F. Hirschbiel ; Waldemar Konrad ; David Schulze-S眉nninghausen ; Steffen Wiedmann ; Burkhard Luy ; Bernhard V. K. J. Schmidt ; Christopher Barner-Kowollik
• 刊名：ACS Macro Letters
• 出版年：2015
• 出版时间：October 20, 2015
• 年：2015
• 卷：4
• 期：10
• 页码：1062-1066
• 全文大小：330K
• ISSN：2161-1653

文摘

We combine supramolecular host鈥揼uest interactions of 尾-cyclodextrin (CD) with light-induced Diels鈥揂lder reactions of 2-methoxy-6-methylbenzaldehyde (photoenol, PE) for the formation of multiblock copolymers. Via the synthesis of a new bifunctional chain transfer agent (CTA) and subsequent reversible addition鈥揻ragmentation chain transfer (RAFT) polymerization, we introduce a supramolecular recognition unit (tert-butyl phenyl) and a photoactive unit (photoenol) to a polymer chain in order to obtain an 伪,蠅-functionalized polymeric center block, having orthogonal recognition units at each chain end. Multiblock copolymers are formed via the light-induced reaction of the photoenol with a maleimide-functionalized polymer chain and the supramolecular self-assembly of the tert-butyl phenyl group with the 尾-CD end group of a third polymer chain. By employing the fast and efficient photoinduced Diels鈥揂lder reaction in combination with supramolecular host鈥揼uest interactions, a novel method for macromolecular modular ligation is introduced.