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香草醛与邻苯二胺缩合反应生成双羟基双亚胺,再与甲苯-2,4-二异氰酸酯的加聚反应,制备了分子骨架上含有—CH=N—键节的共轭亚胺聚氨酯。热重分析分析显示出,分子骨架上引入—CH=N—键节可以提高共轭亚胺聚氨酯材料的热稳定性。而荧光分析则表明,所制备的含有亚按键节的共轭亚胺聚氨酯的N,N-二甲基甲酰胺溶液能发射紫外荧光,而且分子内或分子间相互吸引,形成D-π-A作用和氢键作用,致使分子之间聚集,从而荧光发射光谱随浓度的增大发生红移。
Vanillin and o-phenylenediamine condensation reaction of bis-hydroxy-imine, and then toluene-2,4-diisocyanate polyaddition reaction to prepare a molecular skeleton containing -CH = N- linkages conjugated imine polyurethane . Thermogravimetric analysis showed that the incorporation of -CH = N-linked moiety into the molecular framework can increase the thermal stability of conjugated imine polyurethane materials. Fluorescence analysis showed that the prepared N, N-dimethylformamide solution of conjugated imine polyurethane containing sub-keratin can emit ultraviolet fluorescence, and intramolecular or intermolecular attraction to each other to form D-π-A The role and hydrogen bonding, resulting in aggregation between molecules, and thus fluorescence emission spectra with increasing concentration of redshift.