Segregation Processes in Segmented Polyurethaneurea Solutions Observed by Fluorescence Depolarization
Segregation Processes in Segmented Polyurethaneurea Solutions Observed by Fluorescence Depolarization
复制标题
通过荧光去偏振观察分段聚氨酯脲溶液中的分离过程
DOI：
10.1295/polymj.31.1211
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
S. Nomura
中科院分区：
文献类型：
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作者：
Lameck Banda;Qui TranCong;S. Nomura
The onset of a segregation process in segmented polyurethaneurea (SPUU) solutions was studied by fluorescence spectroscopy using free fluorescein as a probe. For SPUUs with a given molecular weight and a constant ratio of the hard to soft segments, the time-resolved fluorescence measurements reveal the environmental inhomogeneity on the excited lifetime of fluorescein. It is shown in this work that the critical concentration for the segregation process detected by fluorescence spectroscopy through the transition of the anisotropy ratio of the fluorescein occurs at a concentration lower than that observed by small angle X-ray scattering (SAXS). These experimental results indicate that fluorescence depolarization can be used as an alternative method to investigate the structural transition in SPUU solutions.
T.Minami：“使用椭圆扫描条纹相机获得高质量荧光衰减曲线和寿命图像”J.Photochem Photobiol.A Chemistry。
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