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The First Example of Main-Chain Cyclic Azobenzene Polymers

✍ Scribed by Xu Xu; Nianchen Zhou; Jian Zhu; Yingfeng Tu; Zhengbiao Zhang; Zhenping Cheng; Xiulin Zhu

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
237 KB
Volume
31
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

A novel main‐chain azobenzene cyclic polymer, __cyclic‐__PEHPA, has been successfully synthesized by ‘click’ cyclization of the α‐alkyne‐ω‐azido hetero‐difunctional linear precursors (__linear‐__PEHPA), which is synthesized by a step‐growth polymerization of the 3′‐ethynylphenyl[4‐hexyl‐(2‐azido‐2‐methyl‐ propionate) phenyl] azobenzene (EHPA). Gel permeation chromatography, and ^1^H NMR and FT‐IR spectra confirmed the complete transformation of linear‐PEHPA into __cyclic‐__PEHPA. With the same molecular weights, the __cyclic‐__PEHPAs are found to have higher glass transition temperatures than the __linear‐__PEHPAs, but almost the same decomposition temperatures. In addition, the obtained cyclic azobenzene polymer with lower molar mass shows a slightly better trans–cis–trans photoisomerization ability than the corresponding __linear‐__PEHPA.

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