A Postfunctionalization Strategy To Develop PVK−Based Nonlinear Optical Polymers with a High Density of Chromophores and Improved Processibility
A Postfunctionalization Strategy To Develop PVK−Based Nonlinear Optical Polymers with a High Density of Chromophores and Improved Processibility
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DOI：
10.1021/cm000692q
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发表时间：
2001-02
影响因子：
8.6
通讯作者：
Jingdong Luo;J. Qin;Hu Kang;C. Ye
中科院分区：
文献类型：
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作者：
Jingdong Luo;J. Qin;Hu Kang;C. Ye
为了开发具有高发色团密度和高综合性能的聚乙烯基咔唑（PVK）非线性光学聚合物，探索了一种新的后功能化方法。因此，在标准Vilsmeier反应条件下，PVK被高度部分甲酰化（高达52%摩尔比），并且这些高反应性的甲酰基与氰基乙酰化的DR-1缩合，以几乎完全转化得到DR-1官能化的PVK。所得聚合物的玻璃化转变温度为185 °C，通过紫外可见光谱研究了其极化膜的取向行为。通过原位二次谐波产生测量估计为20 pm/V的NLO活性在轻微初始下降后在120 °C下保持1000 h以上不变。
A new strategy for postfunctionalization performed on poly(N-vinylcarbazole) (PVK) has been explored to develop PVK-based nonlinear optical (NLO) polymers with a high density of chromophores and improved comprehensive properties. Thus, under the standard Vilsmeier reaction conditions, PVK is partially formylated to a high degree (up to 52% molar ratio), and these formyl groups of high reactivity are condensed with cyanoacetylated DR-1 to afford a DR-1 functionalized PVK in almost complete conversion. The Tg of the resulting polymer is 185 °C, and the orientation behavior of its poled film is studied by UV−visible spectroscopy. The NLO activity, which is estimated to be 20 pm/V by in situ second harmonic generation measurement, remains unchanged at 120 °C for over 1000 h after a minor initial drop.