Synergistic effects of synthetic phosphonium sulfonates (PhSs) bearing different groups with expandable graphite (EG) on flame retardancy properties in poly(ethylene-co-vinyl acetate) (EVA) rubber blends have been studied by limiting oxygen index (LOI), UL-94 test, cone calorimeter test (CCT), and thermogravimetric analysis (TGA). The EVA/EG/PhS composites revealed excellent flame retardancies. Upon adding 2.5 wt% of PhSs and 20 wt% of EG to EVA matrix, V-0 rating can be achieved. The heat release rate (HRR) and the total heat release (THR) of EVA/PhS-2(2.5 wt%)/EG(20 wt%) and EVA/PhS-4(2.5 wt%)/EG(20 wt%) blends decreased remarkably based on CCT. In addition, the thermal stabilities and mechanical properties of EVA/EG/PhS composites did not deteriorate comparing with those of EVA/EG composites.

通过限制氧指数（LOI），UL- 94测试，锥形量热仪测试（CCT）和热重分析（TGA）。EVA / EG / PhS复合材料具有出色的阻燃性。向EVA基质中添加2.5 wt％的PhS和20 wt％的EG后，可以达到V-0等级。EVA / PhS-2（2.5 wt％）/ EG（20 wt％）和EVA / PhS-4（2.5 wt％）/ EG（20 wt％）的放热率（HRR）和总放热（THR） ），基于CCT，掺混物显着减少。此外，与EVA / EG复合材料相比，EVA / EG / PhS复合材料的热稳定性和机械性能没有降低。