中文摘要：

以可膨胀石墨（EG）与聚磷酸铵（APP）复配组成新型膨胀型阻燃剂（IFR），并将其应用于低密度聚乙烯（LDPE）中，当总添加量（质量分数）为15％，EG／APP质量比为3：1时，复合材料氧指数达到29％，而单独加入EG或者APP时只有27％和21％。表明二者具有良好的协同阻燃效果，并通过热失重测试（TG）、扫描电镜分析（SEM）、傅里叶红外分析（FTIR）阐明了APP和EG在固相和气相中的协同机理。

英文摘要：

A new intumescent flame retardant （IFR） system consisting of expandable graphite （EG） and ammonium polyphosphate （APP） was applied in low-density polyethylene （LDPE）. When the total loading of flame retardant was at 15 wt%, the limited oxygen index （LOI） could reach 29% at a mass ratio of 3：1 for EG and APP. While LOI values of EG-and APP-filled LDPE were only 27% and 21% at the same loading, respectively which indicated the two had well synergistic flame retardant effect. The synergistic mechanism of APP and EG in solid and gas phase was inferred by TG, SEM and FFIR tests.