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采用后重氮偶合法,合成了一种新型含咔唑类聚磷腈有机光折变材料。采用氢谱核磁共振法,红外光谱法,紫外-可见吸收光谱法,热重法和差示扫描量热法对该聚合物进行表征和分析,结果表明,该聚合物具有良好的热稳定性,在230℃开始分解,450℃时基本分解完全。UV-Vis表明波长在360nm与570nm之间的宽的吸收带是由于共轭长度的增加产生的,因此可以调整参加偶合反应的重氮盐比例,来控制偶氮生色团功能组分的接入含量。在未使用外加电场及事先极化的条件下对聚合物进行了二波耦合与四波混频实验,证明了聚合物的光折变特性。得到聚合物P-2和P-3的二波耦合增益系数分别为38cm-1和53.6cm-1,聚合物P-2和P-3的四波混频衍射效率分别为2.7%和8.1%。
A novel carbazole-containing polyphosphazene organic photorefractive material was synthesized by post diazo coupling method. The polymer was characterized and analyzed by 1H-NMR, FT-IR, UV-Vis, TG and DSC. The results showed that the polymer has good thermal stability, At 230 ℃ began to decompose, 450 ℃ basic decomposition completely. UV-Vis shows that the broad absorption band between wavelengths of 360 nm and 570 nm is due to the increase of conjugation length, so the proportion of diazonium salt participating in the coupling reaction can be adjusted to control the connection of the azo chromophore functional components Into the content. The polymer was subjected to two-wave coupling and four-wave mixing experiments without using an applied electric field and prior polarization. The photorefractive properties of the polymer were verified. The two-wave coupling gain coefficients of polymers P-2 and P-3 were 38 cm-1 and 53.6 cm-1, respectively. The four-wave mixing efficiencies of polymer P-2 and P-3 were 2.7% and 8.1% .