Microspheres of polyurethanes functionalized with push-pull type azo chromophores and their photoinduced deformation behavior
Microspheres of polyurethanes functionalized with push-pull type azo chromophores and their photoinduced deformation behavior
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推拉型偶氮发色团功能化聚氨酯微球及其光致变形行为
DOI：
10.1016/j.polymer.2017.01.050
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发表时间：
2017-02
期刊：
影响因子：
4.6
通讯作者：
Xiaogong Wang
中科院分区：
文献类型：
--
作者：
Yuqi Zhou;Bingyang Liu;Xiaogong Wang
通过聚氨酯前体与不同苯胺衍生物的重氮盐的后聚合偶氮偶联反应，合成了一系列含推拉型偶氮生色团的偶氮聚氨酯。在DMF-H_2 O混合溶剂中，通过缓慢增加水含量诱导偶氮聚氨酯聚集，得到了粒径分布较窄的胶体球。通过激光散射和透射电子显微镜研究了自组装过程和形成的结构。在Ar+激光（488 nm）和二极管固体激光（532 nm）的线偏振光照射下，偶氮聚氨酯微球在光偏振方向上表现出明显的伸长变形。偶氮发色团上的吸电子基团对光致形变程度有显著影响。这些微球组成的偶氮聚氨酯轴承羧酸和三氟甲基基团作为吸电子取代基时，显示出最大的变形程度时，分别用488和532 nm的光照射。
A series of azo polyurethanes bearingpush-pulltype azo chromophores was synthesized by post-polymerization azo-coupling reactions between a polyurethane precursor and diazonium salts of different aniline derivatives, respectively. Colloidal spheres with narrow size distributions were obtained by aggregation of these azo polyurethanes in DMF-H2O mixed solvents, which were induced by slowly increasing the water content. The self-assembling processes and formed structures were investigated by laser light scattering and transmission electron microscopy. When irradiated with linearly polarized light from Ar+laser (488 nm) and diode solid state laser (532 nm), the azo polyurethane microspheres showed significant deformations elongated in the light polarization direction. The electron-withdrawing groups on the azo chromophores show a significant effect on the photoinduced deformation degree. These microspheres composed of the azo polyurethanes bearing carboxylic acid and trifluoromethyl groups as the electron-withdrawing substituents shows the largest deformation degrees when irradiated with 488 and 532 nm light, respectively.
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DOI：
10.1002/chin.200029276
发表时间：
2000-07
期刊：
ChemInform
影响因子：
--
作者：
J. Delaire;K. Nakatani
通讯作者：
J. Delaire;K. Nakatani
影响因子：
15
作者：
D. Whitten;P. Wildes;J. G. Pacifici;G. Irick
通讯作者：
D. Whitten;P. Wildes;J. G. Pacifici;G. Irick
影响因子：
4.6
作者：
Yu-Qian Zhou;Bingyang Liu;Xiaogong Wang
通讯作者：
Yu-Qian Zhou;Bingyang Liu;Xiaogong Wang
影响因子：
5.5
作者：
Oleh M. Tanchak;C. Barrett
通讯作者：
Oleh M. Tanchak;C. Barrett
影响因子：
4.6
作者：
Junpeng Liu;Yaning He;Xiaogong Wang
通讯作者：
Junpeng Liu;Yaning He;Xiaogong Wang