Synthesis and optical properties of three novel functional polyurethanes bearing nonlinear optical chromophoric pendants with different π electron conjugation bridge structure
Synthesis and optical properties of three novel functional polyurethanes bearing nonlinear optical chromophoric pendants with different π electron conjugation bridge structure
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DOI：
10.1016/j.polymer.2006.08.006
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发表时间：
2006-09
期刊：
影响因子：
4.6
通讯作者：
Hongyao Xu;Shouchun Yin;Weiju Zhu;Yinglin Song;B. Tang
中科院分区：
文献类型：
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作者：
Hongyao Xu;Shouchun Yin;Weiju Zhu;Yinglin Song;B. Tang
合成了具有不同共轭桥结构的大π电子共轭侧基的高分子量功能聚氨酯（poly（1a），poly（1b），poly（1c）），并用FTIR，1H NMR和UV-vis吸收光谱对其进行了表征。通过光限幅和非线性光学分析评价了它们的光学性质。结果表明，这些聚合物具有良好的光限幅和较大的非线性光学性能，这与NLO发色链段的D-π-A共轭长π电子结构有关。在相同的线性透过率下，以CC双键为π电子共轭桥结构的Poly（1a）比以CN或NN双键为共轭桥结构的poly（1b）和poly（1c）具有更好的光限幅性能，而以NN双键作为NLO-发色链段的π电子共轭桥的poly（1c）的非线性光学性能比poly（1a）和poly（1b）好上级。以CC和CN双键分别作为π电子共轭桥结构。
High molecular weight functional polyurethanes bearing large π electron conjugated chromophoric pendants with different conjugation bridge structure, poly(1a), poly(1b), and poly(1c), were synthesized and characterized by FTIR,1H NMR and UV–vis absorption spectra. Their optical properties were evaluated by optical limiting and nonlinear optical analyses. The results show that these polymers possess good optical limiting and large nonlinear optical properties, which are attributed to the long D–π–A conjugated π electron structure of the NLO-chromophoric segment. Poly(1a) with CC double bond as π electron conjugation bridge shows better optical limiting property than poly(1b) and poly(1c) with CN or NN double bond as conjugation bridge structure under the same linear transmittance, while poly(1c) with NN double bond as π electron conjugation bridge of the NLO-chromophoric segment is superior on nonlinear optical properties to poly(1a) and poly(1b) with CC and CN double bonds as π electron conjugation bridge structure, respectively.