Effect of particle size on the flame retardancy of poly(butylene succinate)/Mg(OH)₂ composites

Summary Poly(butylene succinate)/magnesium hydroxide (PBS/Mg(OH) 2 ) composites were prepared by melt compounding to investigate the effect of particle size on the flame retardancy of PBS. Their flammability properties were investigated by limiting oxygen index, UL‐94, and cone calorimeter tests, which suggested that the medium‐sized Mg(OH) 2 ‐5 µm displayed the best flame retardancy. The residual char structure were analyzed and indicated that Mg(OH) 2 ‐5 µm could form a better protective layer than other sized particles, leading to the better flame retardancy to PBS.