Stretching-enhanced emission behavior of polyurethane composites containing pyrene derivatives
Stretching-enhanced emission behavior of polyurethane composites containing pyrene derivatives
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DOI：
10.1016/j.polymer.2021.124364
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发表时间：
2021-11
期刊：
影响因子：
4.6
通讯作者：
Xinzhu Sun;D. Guo;Yifeng Cao;Faxu Lin;Huahua Huang;Zhiyong Yang;Yongming Chen;Zhenguo Chi
中科院分区：
文献类型：
--
作者：
Xinzhu Sun;D. Guo;Yifeng Cao;Faxu Lin;Huahua Huang;Zhiyong Yang;Yongming Chen;Zhenguo Chi
将芘（Py）及其衍生物1-羟基芘（HPY）、1-芘甲醇（PYM）和1-芘基硼酸（PBA）分别掺杂到热塑性聚氨酯（PU）中，通过物理共混制备了一系列力学响应荧光复合膜。芘衍生物的极性基团和聚氨酯硬段含量对复合膜的荧光性能有影响。掺杂PYM显示出更强的趋势，聚集在PU基质中，相对于其他染料。与PU/Py和大多数先前报道的机械响应材料相反，PU 25/PYM和PU 50/PYM膜中聚集的PYM分子的发射强度表现出拉伸增强发射特征。当PU 25/PYM被拉伸到500%时，其在490和400 nm处的双发射峰的强度比从2.3增加到5.3。红外光谱分析表明，PYM与PU基体硬段之间形成了强氢键，这与PYM的力学响应行为有关。通过拉伸增强而不是降低染料的发射强度在机械响应材料领域将是显著的。
A series of mechanoresponsive fluorescence composite films were prepared by doping pyrene (Py) and its derivatives including 1-hydroxypyrene (HPY), 1-pyrenemethanol (PYM) and 1-pyrenylboronic acid (PBA) into thermoplastic polyurethane (PU)viaphysical blending, respectively. The fluorescence property of the composite films was found to be influenced by the polar group of pyrene derivatives and the content of hard segment of PU. The doped PYM showed a stronger trend to aggregate in PU matrixes, relative to other dyes. Contrary to PU/Py and most of previously reported mechanoresponsive materials, the emission intensity of aggregated PYM molecules in both PU25/PYM and PU50/PYM films exhibited a stretching-enhanced-emission feature. When PU25/PYM was stretched up to 500%, the intensity ratio of its dual emission peaks at 490 and 400 nm increased from 2.3 to 5.3. This interesting mechanoresponsive behavior was related to the formation of strong hydrogen bonding between PYM and hard segment of PU matrixes proved by FT-IR spectrograph. Enhancing instead of reducing the emission intensity of dyes through stretching would be remarkable in the field of mechanoresponsive materials.