为了在提高乙烯-醋酸乙烯酯共聚物（EVA）基复合材料低烟无卤阻燃性能的同时保持或提升其力学性能，研究以油胺（OA）和氨基三亚甲基膦酸（ATMP）为原料，合成含双键的磷氮化合物（OT），并通过熔融共混引入乙烯-醋酸乙烯酯共聚物/氢氧化镁（EVA/MH）共混复合体系。采用傅里叶变换红外光谱仪（FTIR）、扫描电子显微镜（SEM）、旋转流变仪、差示扫描量热仪（DSC）、万能试验机和极限氧指数（LOI）测试仪等对OT和EVA/MH复合材料的结构和性能进行测试与表征。结果表明：OT的引入可改善材料交联结构，并防止分子链的断裂；OT可提高MH在聚合物基体中的分散性，促进EVA的结晶，提高材料的阻燃和力学性能。当OT添加量为2份时，复合材料的拉伸强度为13.8 MPa，断裂伸长率为432%，LOI达到39.0%，材料兼具优良的阻燃及力学性能。

In order to enhance the low smoke halogen-free flame retardant properties of ethylene vinyl acetate copolymer (EVA) based composite materials while maintaining or improving their mechanical properties, a study was conducted to synthesize a phosphorus-nitrogen compound (OT) containing double bonds using oleylamine (OA) and amino trimethylene phosphonic acid (ATMP) as raw materials, and then introduce it into the ethylene-vinyl acetate copolymer/magnesium hydroxide (EVA/MH) blend composite system through melt blending. The structure and properties of the OT and EVA/MH composite materials were tested and characterized using a Fourier transform infrared spectrometer (FTIR), a scanning electron microscope (SEM), a rotational rheometer, a differential scanning calorimeter (DSC), a universal testing machine and a limiting oxygen index (LOI) tester. The results show that the introduction of OT optimizes the cross-linking structure of the material and prevents the breakage of the molecular chains. OT promotes the dispersion of MH within the polymer matrix, aids in the crystallization of EVA, and notably enhances the flame-retardant and mechanical characteristics of the material. The composites display a tensile strength of 13.8 MPa, an elongation at break of 432%, and an LOI of 39.0% with the addition of 2 phr of OT, demonstrating their outstanding flame retardant and mechanical properties.