Ethylene-vinylacetate (EVAC)/halogen-free flame retardant copolyester (P-PET)alloy was prepared with organic montmorillonite (OMMT)as a modifier during melt extrusion.The effect of OMMT on properties of EVAC/P-PET blends was evaluated by mechanical property test,differential scanning calorimetry (DSC),melt flow rate (MFR),limited oxygen index (LOI) and thermogravimetric analysis (TGA).The result show that OMMT improve the overall performance of the blend,when EVAC/P-PET/OMMT is 70/30/3,the tensile strength and elongation at break are increased by 63.7%and 38.1%respectively based on neat blends,crystallization properties of the blends are also improved.The MFR analysis show that the addition of OMMT reduce the melt flow properties of the blends.LOI and TGA indicate that adding OMMT improve the flame retardant property and thermostability of the alloy.%以纳米有机蒙脱土(OMMT)作为乙烯-乙酸乙烯酯共聚物(EVAC)/无卤阻燃共聚聚酯(P-PET)共混物的改性剂，采用熔融挤出共混法制备了EVAC/P-PET共混合金。通过力学性能、差示扫描量热法(DSC)、熔体流动速率(MFR)、极限氧指数(LOI)、热失重分析(TGA)等手段，研究了OMMT对共混合金性能的影响。结果表明， OMMT提高了共混合金的综合性能，当EVAC/P-PET/OMMT配比为70/30/3时，拉伸强度和断裂伸长率比不含OMMT的体系分别提高了63.7%和38.1%，同时改善了共混合金的结晶性能。MFR分析表明，OMMT的加入降低了共混合金的熔体流动性能。LOI和TGA表明，OMMT的加入提高了共混合金的阻燃性和热稳定性。
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