Synthesis of New-type Retinyl Schiff Base Salts and its Microwave Absorption Performance

By hydrolysis of Vitamin A acetate,retinal was oxidized by active MnO_2 to form retinene and then the product reacted with benzidine to synthesize retinyl schiff base.The retinyl schiff base salt was synthesized through the adulteration of silver nitrate.The effect of oxidant on yields was studied,and the product structure was characterized by element analysis and IR.The results showed that retinene was oxidized by active MnO_2 for 26h in room temperature,the retinyl schiff base salt was synthesized at 80℃ for 4h.The absorption range of schiff base salt was at 2～18GHz,and the optimum reflectirity rate was-16dB.