Graphene(GN)modified polystyrene(PS)was used to prepare flame retardant PS/GN thermal insulation material,and its mechanical properties and thermal properties were studied.The results show that KH-550 is successfully grafted onto the surface of GN.With the increase of GN content,the mechanical properties and heat resistance of PS/GN insulation materials gradually increase,and the thermal conductivity gradually decreases.When the content of GN is not more than 0.3%,the mechanical properties and heat resistance of PS/GN insulation material increase significantly,and the thermal conductivity increases little.The optimum content of GN is 0.3%,at this time,the compressive strength of PS/GN insulation material is increased by 37.2%,the initial degradation temperature is increased by 29℃,the mass residue is increased by 0.7%,and the thermal conductivity is 0.037 1 W/(m·K).
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