▎ 摘　　要

NOVELTY - Preparing cage polysilsesquioxane-graphene modified high thermal conductivity polystyrene, comprises e.g. (i) placing graphene oxide powder in a constant temperature chamber filled with helium and nitrogen at a volume ratio of 1:1, and reacting at 260-280 degrees C for 20-50 minutes to obtain hydroxylated graphene, (ii) adding hydroxylated graphene to anhydrous ethanol solvent, ultrasonicating by using an ultrasonic device for 4-6 hours, adding gamma -mercaptopropyltriethoxysilane, refluxing at 70-90 degrees C for 1-3 hours to obtain gamma -mercaptopropyltriethoxysilanized graphene, washing, and drying, (iii) adding vinyl triethoxy silane to the mixed solvent of acetone, concentrated hydrochloric acid and distilled water with a volume ratio of 470-540:80-110:100, stirring and refluxing at 35-55 degrees C for 20-30 hours, and washing the obtained solid product with acetone to obtain octavinyl cage silsesquioxane, and (iv) adding octavinyl cage silsesquioxane and gamma -mercaptopropyl triethoxysilanized graphene. USE - The method is useful for preparing cage polysilsesquioxane-graphene modified high thermal conductivity polystyrene. ADVANTAGE - The polystyrene: has excellent mechanical properties and thermal conductivity; introduces graphene which makes the mechanical properties e.g. tensile strength of polystyrene; and improves the thermal conductivity and heat resistance. DETAILED DESCRIPTION - Preparing cage polysilsesquioxane-graphene modified high thermal conductivity polystyrene, comprises (i) placing graphene oxide powder in a constant temperature chamber filled with helium and nitrogen at a volume ratio of 1:1, and reacting at 260-280 degrees C for 20-50 minutes to obtain hydroxylated graphene, (ii) adding hydroxylated graphene to anhydrous ethanol solvent, ultrasonicating by using an ultrasonic device for 4-6 hours, adding gamma -mercaptopropyltriethoxysilane, refluxing at 70-90 degrees C for 1-3 hours to obtain gamma -mercaptopropyltriethoxysilanized graphene, centrifugally washing, and drying, (iii) adding vinyl triethoxy silane to the mixed solvent of acetone, concentrated hydrochloric acid and distilled water with a volume ratio of 470-540:80-110:100, stirring and refluxing at 35-55 degrees C for 20-30 hours, and washing the obtained solid product with acetone to obtain octavinyl cage silsesquioxane, (iv) adding octavinyl cage silsesquioxane and gamma -mercaptopropyl triethoxysilanized graphene to the toluene solvent, using azobisisobutyronitrile as an initiator, reacting at 70-100 degrees C for 4-10 hours, filtering out the solid impurities, and removing the excess toluene by rotary evaporation to obtain cage polysilsesquioxane-graphene, (v) adding styrene, dispersant polyvinyl alcohol and cage polysilsesquioxane-graphene to distilled water solvent, using dibenzoyl peroxide as initiator, reacting at 80-90 degrees C and refluxing for 6 hours.