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中文摘要：
对聚磷酸铵（APP）和膨胀石墨（EG）协同阻燃乙烯。醋酸乙烯酯共聚物（EVA）及其阻燃机理进行了研究。结果表明，APP和EG对EVA具有良好的协同阻燃效果。通过热重分析（TG）、红外光谱（FT-IR）、扫描电镜（SEM）以及X射线光电子能谱（XPS）等手段对其阻燃机理进行了分析，认为在受热前期，主要是EG在凝聚相中的阻燃机理；在中后期，主要是APP在凝聚相发挥阻燃作用和部分的气相阻燃机理。
英文摘要：
Ammonium polyphosphate（APP） and expandable graphite（EG） have been used to improve flame retardancy of poly（ethylene-co-vinyl acetate）（EVA）. The flame-retardant mechanism of EVA/APP/EG system has been investigated by TGA, SEM, FTIR and XPS. SEM is used to observe the structures of the intumescent charred layers. EG expands into a worm-like char structure when exposed to heat, and this kind of char structure can block the mass and heat transfer, and protect the underlying EVA from combustion. The chars generated at different temperatures have been studied by FT-IR and XPS, respectively. The residues contain ammonium salt, unsaturated compounds, polyaromatics, phosphoric and ployphosphoric acids, and some EVA that is not burned completely. Based upon all the results mentioned above, a possible flame-retardant mechanism has been proposed.
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