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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. 扫描电子显微镜观测发现，经IFR阻燃的ABS在燃烧时形成了由无数封闭孔洞构成的蓬松焦化炭层，表明IFR对ABS具有良好的膨胀阻燃效果。