Structure and photoresponsive behaviors of multiwalled carbon nanotubes grafted by polyurethanes containing azobenzene side chains
Structure and photoresponsive behaviors of multiwalled carbon nanotubes grafted by polyurethanes containing azobenzene side chains
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DOI：
10.1021/jp0728510
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发表时间：
2007-07
影响因子：
3.7
通讯作者：
Yingkui Yang;Xiaotao Wang;Lang Liu;Xiaolin Xie;Zhifang Yang;R. Li;Y. Mai
中科院分区：
文献类型：
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作者：
Yingkui Yang;Xiaotao Wang;Lang Liu;Xiaolin Xie;Zhifang Yang;R. Li;Y. Mai
两种光响应性偶氮苯聚芳醚功能化多壁碳纳米管在端羟基碳纳米管（MWNT−OH）存在下，通过含双羟基偶氮苯单体（AzoM）与两种类型的二异氰酸酯（作为软单体的脂肪族二异氰酸酯（HDI）和作为刚性单体的芳香族二异氰酸酯（TDI））的原位缩聚成功地合成了AzoPU-MWNTs，并研究了它们的光化学行为。傅里叶变换红外（FTIR）、拉曼（Raman）、核磁共振（1H NMR）和透射电子显微镜（TEM）研究表明，偶氮苯聚氨酯共价接枝到了碳纳米管表面，形成了以碳纳米管为硬核、聚合物层为软壳的核-壳结构，接枝聚合物的平均厚度约为7 - 10 nm。因此，不溶性MWNTs的溶解性和偶氮聚氨酯的热稳定性的显着改善，同时获得。AzoPU-MWNTs具有可逆的光异构体。
Two kinds of photoresponsive azobenzene polyurethane-functionalized multiwalled carbon nanotubes (AzoPU-MWNTs) were successfully synthesized by in situ polycondensation of azobenzene monomer containing bis-hydroxyl (AzoM) with two types of diisocyanates, an aliphatic diisocyanate (HDI) as soft monomer and an aromatic diisocyanate (TDI) as rigid monomer, in the presence of MWNTs with terminated multihydroxyl groups (MWNT−OH), and their photochemical behaviors were investigated. Fourier transform infrared (FTIR), Raman, and 1H NMR spectra and transmission electron microscopy (TEM) revealed that azobenzene polyurethanes were covalently grafted onto the surfaces of MWNTs, forming core−shell structures with MWNT as hard core and polymer layer as soft shell, and the average thickness of the grafted polymers was about 7−10 nm. Thereby, evident improvements in the solubility of insoluble MWNTs and thermal stability of the azo polyurethanes were simultaneously obtained. The AzoPU-MWNTs showed reversible photoisome...