Study on Mechanical Properties and Heat Resistance of Flame-Retardant Polycarbonate
Graphite oxide(GO)was used to modify polycarbonate(PC)to prepare flame retardant PC composites and the effects of GO content on the flame retardancy,mechanical properties,and heat resistance of composites.The results showed that the flame retardancy and heat resistance of composites increased with the increase of GO content,and the tensile strength,bending strength,and impact strength of the composites continued to increase,while the elongation at break gradually decreased.When the GO content is 3%,the composites with good flame retardancy,mechanical properties,and heat resistance can be obtained.At this time,the limited oxygen index(LOI)of the composites reaches 32.8%,the flame retardancy level reaches V-0,and the total heat release(THR)and total smoke production(TSP)are reduced by 45.8% and 75.7%,respectively.Compared with pure PC,the tensile strength,bending strength,and impact strength are increased by 25.4%,33.7%,and 63.2%,respectively,the elongation at break is reduced by 7.1% .The temperature at which the weight loss is 5% is increased by 19℃,the peak temperature of thermal weight loss is increased by 52℃,and the mass residual rate of thermal decomposition is increased by 8.9% .
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