苯甲酸功能化石墨烯-Al(OH)3协同阻燃聚丙烯

以氧化石墨（GO）为原料，制备了苯甲酸功能化石墨烯（BFG），采用IR和XRD对BFG结构进行了表征。再将BFG作为阻燃协效剂添加到Al（OH）₃/聚丙烯（PP）中，研究不同质量比的BFG与Al（OH）₃对PP材料阻燃和力学性能的影响。通过对阻燃BFG-Al（OH）₃/PP复合材料进行极限氧指数（LOI）测试、热失重分析、锥形量热分析、拉伸测试及残炭SEM分析，考察BFG-Al（OH）₃/PP复合材料的阻燃性能和力学性能。研究结果表明，与其他阻燃PP相比，1.5wt% BFG-38.5wt% Al（OH）₃/PP的阻燃和力学性能最佳，LOI可达到24.6%，拉伸强度为20.64 MPa，且其热释放速率峰值和总热释放量比纯PP分别降低了51.5%和18.6%。

Synergistic effect of benzoic acid-functionalized graphene-Al(OH)3 on flame retardant of polypropylene

The graphene functionalized by benzyl acid (BFG) was prepared based on graphene oxide (GO). The structure and morphology of BFG were characterized by IR and XRD. BFG, as a kind of flame retardant synergist, was added to Al(OH)₃/polypropylene (PP), in which Al(OH)₃ was used as the flame retardant. The effect of mass ratio of BFG to Al(OH)₃ on the flame retardancy and mechanical properties of BFG-Al(OH)₃/PP composites was studied. The limiting oxygen index (LOI) test, thermogravimetric analysis, cone calorimetry analysis, tensile test and residual carbon scanning analysis were progressed to investigate the flame retardancy and mechanical properties of BFG-Al(OH)₃/PP composites. The results show that the flame retardancy and mechanical properties of 1.5wt%BFG-38.5wt%Al(OH)₃/PP composite are the best, whose LOI is 24.6%, tensile strength is 20.64 MPa, respectively, and its thermal release rate peak and total heat release is reduced by 51.5% and 18.6% compared with the pure PP sample, respectively.