Self-Assembled Superhelical Structure of Poly(N-vinylcarbazole)-Based Donor–Acceptor Polymer at the Air–Water Interface

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• 作者：Shanshan Liu ; Qibin Chen ; Yu Chen ; Bin Zhang ; Honglai Liu ; Changjun Peng ; Ying Hu
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：January 14, 2014
• 年：2014
• 卷：47
• 期：1
• 页码：373-378
• 全文大小：442K
• ISSN：1520-5835

文摘

Preparation of helical polymers designed for mimicking biological helices and developing supramolecular helical assemblies with a controlled helix sense still remains a major challenge. A previously unknown superhelical structure constructed by achiral random copolymer poly(N-vinylcarbazole) (PVK) with pendant azobenzene chromophores and terminal nitro moieties (PVK鈥揂ZO鈥揘O₂) at the air/water interface was systematically investigated by CD spectroscopy, AFM, and TEM. The compression of the interfacial films may induce the helices to coil up and form large superhelices with the opposite handedness in a manner analogous to forming the supercoiled tertiary structure of DNA. The structure model for the self-assembly of PVK鈥揂ZO鈥揘O₂ into suprahelical structures at the air/water interface was also proposed.