▎ 摘　　要

NOVELTY - Preparing graphene oxide/azo polyimide composite thermo-optical material comprises (i) preparing functionalized graphene oxide, (ii) dissolving 2,4-amino-4-nitro azobenzene chromophore molecule in N-methylpyrrolidone, adding pyromellitic dianhydride and stirring the mixture in nitrogen atmosphere to obtain polyamide acid solution of azobenzene, and (iii) adding functionalized graphene oxide obtained in the step (i) into polyamide acid solution of azobenzene obtained in the step (ii), reacting, adding toluene, heating in oil bath and incubating to obtain product. USE - The method is useful for preparing graphene oxide/azo polyimide composite thermo-optical material (claimed). ADVANTAGE - The method is simple, has high controllability and improves thermo-optical property and thermal stability of product. DETAILED DESCRIPTION - Preparing graphene oxide/azo polyimide composite thermo-optical material comprises (i) adding graphite oxide and N,N-dimethylformamide (DMF) into a reaction vessel equipped with a stirrer and a reflux condenser, carrying out ultrasonic dispersion for 0.5-3 hours, adding ethylenediamine and 2-(7-azo benzotriazole)-N,N,N',N'-tetramethyluronium hexafluorophosphate (HATU) and reacting at 30-90 degrees C for 2-10 hours to obtain functionalized graphene oxide, where the mass ratio of graphite oxide and DMF is 1:10-500, the mass ratio of graphite oxide and ethylenediamine is 1:10-300, and the mass ratio of graphite oxide and HATU is 1:0.01-0.1, (ii) dissolving 2,4-amino-4-nitro azobenzene chromophore molecule in N-methylpyrrolidone, adding pyromellitic dianhydride and stirring the mixture in nitrogen atmosphere for 0.5-5 hours to obtain polyamide acid solution of azobenzene, where the mass ratio of 2,4-amino-4-nitro azobenzene chromophore molecule and N-methylpyrrolidone is 1:10-600, and the mass ratio of azobenzene chromophore molecule and pyromellitic dianhydride is 1:0.96-1.36, and (iii) adding functionalized graphene oxide obtained in the step (i) into polyamide acid solution of azobenzene obtained in the step (ii), reacting for 0.5-5 hours, adding toluene, heating to 165-200 degrees C in oil bath and incubating for 1-4 hours to obtain product, where the amount of functionalized graphene oxide is 0.2-3.2 wt.% of total amount of azobenzene chromophore and pyromellitic dianhydride, and the mass ratio of functionalized graphene oxide and toluene is 1:50-200. An INDEPENDENT CLAIM is also included for graphene oxide/azo polyimide composite thermo-optical material prepared by the above method.