▎ 摘　　要

NOVELTY - Graphene oxide is reduced by dispersing graphene oxide in deionized water using an ultrasonic processor to obtain a solution, adding p-phenylenediamine and ammonia aqueous solution mixture, stirring to obtain an alkaline solution, stirring mechanically, reflux heating, filtering, washing the filter cake with ethanol, and drying. USE - Method of reducing graphene oxide. ADVANTAGE - The reduction has good dispersibility, improves electric conductivity of polystyrene, obtains product having seepage threshold value that below than 0.34 vol.% and sharp transition from insulation to electric conduction, and improves thermostability of the product by as much as 8 degrees C relative to polystyrene. DETAILED DESCRIPTION - Graphene oxide is reduced by: (A) dispersing graphene oxide in deionized water using an ultrasonic processor to obtain a solution having a concentration of 0.5-2 mg/ml; (B) adding p-phenylenediamine and ammonia aqueous solution (3 mu g/ml) mixture (10 times graphene oxide quantity), and stirring to obtain an alkaline solution; (C) stirring mechanically, and reflux heating at 90-100 degrees C for 0.25-3 hours; (D) filtering, washing the filter cake with ethanol, subjecting to ultrasonic processing, filtering, and repeating the washing and filtering for several times to remove absorbed p-phenylenediamine; and (E) drying at 80 degrees C for 24 hours. An INDEPENDENT CLAIM is included for a method for preparing electroconductive nanocomposite material comprising: (A) dispersing ultrasonically graphene oxide-p-phenylenediamine or graphene oxide in tetrahydrofuran solution to obtain solution A, and taking graphene oxide (0.5-2 mg/ml) before reaction as metering standard; (B) dissolving polystyrene (0.1-0.2 g/ml) in tetrahydrofuran at 30 degrees C, adding solution A, and stirring for 2 hours, and precipitating by adding methanol; and (C) filtering, drying the filter cake at 80 degrees C, and vacuum hot pressing machine at 210 degrees C and pressure of 10 MPa.