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利用多巴胺(DOPA)对多壁碳纳米管(MWNTs)进行表面改性后得到MWNTs-PDA,通过熔融共混的方法制备MWNTs-PDA/DBDPE/Sb_2O_3/PA6复合材料。通过傅里叶红外变化光谱(FTIR)和极限氧指数(LOI)、垂直燃烧(UL-94)、热失重分析(TGA)和力学性能测试等方法分别研究了MWNTs的表面修饰情况和不同浓度多巴胺修饰的MWNTs对MWNTs-PDA/DBDPE/Sb_2O_3/PA6复合材料阻燃性能、热稳定性能及力学性能的影响。结果表明:随着多巴胺浓度的增加,复合材料的阻燃性能随之逐渐增大,热稳定性能变化不大,力学性能则呈先增大后减小的趋势。当多巴胺浓度为3 g/L时,复合材料的力学性能最佳,拉伸强度、弯曲强度和冲击强度分别为73.84、89.96 MPa、9.23 k J/m~2。
MWNTs-PDA was obtained by surface modification of MWNTs with dopamine (DOPA), and MWNTs-PDA / DBDPE / Sb_2O_3 / PA6 composites were prepared by melt blending. The surface modification of MWNTs was studied by FTIR, UL-94, TGA and mechanical properties tests, respectively. The effects of different concentrations of dopamine Effect of Modified MWNTs on Flame Retardancy, Thermal Stability and Mechanical Properties of MWNTs-PDA / DBDPE / Sb_2O_3 / PA6 Composites. The results showed that with the increase of dopamine concentration, the flame retardant properties of the composites gradually increased, the thermal stability changed little, and the mechanical properties first increased and then decreased. When the concentration of dopamine is 3 g / L, the mechanical properties of the composites are the best, the tensile strength, flexural strength and impact strength are 73.84,89.96 MPa and 9.23 kJ / m ~ 2, respectively.