阻燃型聚碳酸酯的力学性能和耐热性能研究

Study on Mechanical Properties and Heat Resistance of Flame-Retardant Polycarbonate

采用氧化石墨烯(GO)改性聚碳酸酯(PC),制备阻燃型PC复合材料,研究GO对复合材料阻燃性能、力学性能和耐热性能的影响。结果表明:复合材料阻燃性能和耐热性能,随着GO掺量的增加而增大,复合材料拉伸强度、弯曲强度和抗冲击强度均不断增大,断裂伸长率逐渐降低。GO掺量为3%时,能够得到阻燃性能、力学性能和耐热性能较好的复合材料,此时复合材料极限氧指数(LOI)达到32.8%,阻燃等级达到V-0级,总热释放量(THR)和总产烟量(TSP)分别降低45.8%和75.7%;与纯PC相比,拉伸强度、弯曲强度和抗冲击强度分别提高25.4%、33.7%和63.2%,断裂伸长率降低7.1%;失重5%的温度提高19℃,热失重峰值温度提高52℃,热分解质量保留率提高8.9%。

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%.