Soluble Main-Chain Azobenzene Polymers via Thermal 1,3-Dipolar Cycloaddition: Preparation and Photoresponsive Behavior

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• 作者：Xiaoqiang Xue ; Jian Zhu ; Zhengbiao Zhang ; Nianchen Zhou ; Yingfeng Tu ; Xiulin Zhu
• 刊名：Macromolecules
• 出版年：2010
• 出版时间：March 23, 2010
• 年：2010
• 卷：43
• 期：6
• 页码：2704-2712
• 全文大小：904K
• 年卷期：v.43,no.6(March 23, 2010)
• ISSN：1520-5835

文摘

Two soluble polymers containing azobenzene chromophore in main chain were successfully synthesized from α-azide, ω-alkyne A−B type azobenzene monomers, 3′-ethynylphenyl[4-hexoxyl(2-azido-2-methylpropionate)phenyl]azobenzene (EHPA) and 3′-ethynylphenyl[4-(4-azidobutoxy)phenyl]azobenzene (EAPA), via thermal 1,3-dipolar cycloaddition in bulk. Compared to the polymers obtained from Cu(I)-catalyzed 1,3-dipolar cycloaddition (“click” chemistry), the polymers obtained from thermal 1,3-dipolar cycloaddition showed good solubility in common solvents like CHCl₃ and THF and good film-forming ability. The polymers were thermally stable up to 330 °C. The structures of the main-chain azobenzene polymers were characterized by gel permeation chromatography (GPC), ¹H NMR, UV−vis, and FT-IR spectra. The photoinduced trans−cis isomerization of the polymers in chloroform (CHCl₃) solution was examined. With illumination of linearly polarized Kr⁺ laser beam at 413.1 nm, surface relief gratings formed on PEHPA2 spin-coating films were investigated.