▎ 摘　　要

NOVELTY - Preparing polydimethylsiloxane/graphene oxide porous composite material comprises e.g. mixing polydimethylsiloxane prepolymer, crosslinking agent and cyclohexane, and adding porogen particles, then ultrasonic stirring and pouring the polytetrafluoroethylene, then flattening and curing in the mold, demolding the polydimethylsiloxane-porogen solid mixture and removing the porogen particles to obtain polydimethylsiloxane porous material, and preparing hydroxylated polydimethylsiloxane porous material and aminated polydimethylsiloxane porous material, then immersing the aminated polydimethylsiloxane porous material in a graphene oxide dispersion, then adding mixed solution of condensing agent N,N'-dicyclohexylcarbodiimide and catalyst 4-dimethylaminopyridine, then heating and stirring for 16-24 hours, washing the product with dimethylformamide with anhydrous ethanol, vacuum drying to obtain final product. USE - The polydimethylsiloxane/graphene oxide porous composite material is useful as oil absorbing material in oil-water separation (claimed). ADVANTAGE - The composite material has high hydrophobic and lipophilic characteristics, oil-water selective adsorption capacity and excellent mechanical properties. DETAILED DESCRIPTION - Preparing polydimethylsiloxane/graphene oxide porous composite material comprises (i) mixing polydimethylsiloxane prepolymer, crosslinking agent and cyclohexane, and adding porogen particles having a particle size of 50-2000 mu m, then ultrasonically stirring and pouring the polytetrafluoroethylene, then flattening and curing in the mold, demolding the polydimethylsiloxane-porogen solid mixture and removing the porogen particles to obtain polydimethylsiloxane porous material, where the mass ratio between polydimethylsiloxane prepolymer, cyclohexane and porogen particles is 10:8-18:60-90, (ii) placing polydimethylsiloxane porous material obtained in the step (i) in a strong alkaline solution, stirring reaction at 50-90 degrees C for 4-8 hours, waiting for the reaction to be completed, washing the product with deionized water, then drying at 40-50 degrees C for 6-8 hours to obtain hydroxylated polydimethylsiloxane porous material, where the strong alkaline solution is an aqueous solution of sodium hydroxide, potassium hydroxide or barium hydroxide, (iii) combining anhydrous ethanol and deionized water into an alcohol aqueous solution, and adding silane coupling agent KH550 to the mixture at room temperature for stirring, and adding hydroxylated polydimethylsiloxane porous material obtained in the step (ii) is immersed in the solution after 15-20 minutes, and heating at 70-80 degrees C for 10-12 hours, washing the product with absolute ethanol, and then drying at 40-50 degrees C for 6-8 hours to obtain aminated polydimethylsiloxane porous material, where the molar ratio between anhydrous ethanol, deionized water and silane coupling agent KH550 is 80-100:2-20:2, and the mass ratio between silane coupling agent KH550 and hydroxylated polydimethylsiloxane porous material is 0.2-0.6:1, and (iv) immersing the aminated polydimethylsiloxane porous material of step (iii) in a graphene oxide dispersion having concentration of 0.1-2 mg/ml, then adding mixed solution of condensing agent N,N'-dicyclohexylcarbodiimide and catalyst 4-dimethylaminopyridine, then heating at 60-80 degrees C and stirring the reaction for 16-24 hours, washing the product with dimethylformamide, then washing with anhydrous ethanol, vacuum drying at 20-40 degrees C for 1-2 days to obtain final product, where the solvent of the mixed solution and solvent of graphene oxide dispersion are both dimethylformamide. An INDEPENDENT CLAIM is also included for polydimethylsiloxane/graphene oxide porous composite material is obtained by above method.