The first example of main-chain cyclic azobenzene polymers.
The first example of main-chain cyclic azobenzene polymers.
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DOI：
10.1002/marc.201000218
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发表时间：
2010-10
影响因子：
4.6
通讯作者：
Xu Xu-Xu;Nianchen Zhou;Jian Zhu;Y. Tu;Zhengbiao Zhang;Zhenping Cheng;Xiu-lin Zhu
中科院分区：
文献类型：
--
作者：
Xu Xu-Xu;Nianchen Zhou;Jian Zhu;Y. Tu;Zhengbiao Zhang;Zhenping Cheng;Xiu-lin Zhu
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.
