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SEM observation revealed that puffy coking charred layers were formed by lots of closed bubbles in ABS specimen filled with IFR after burning. 掃描電子顯微鏡觀測發現，經IFR阻燃的ABS在燃燒時形成了由無數封閉孔洞搆成的蓬松焦化炭層，表明IFR對ABS具有良好的膨脹阻燃傚果。