硅酸盐纳米短纤维增强EVA复合材料的阻燃和力学性能

以氢氧化镁Mg(OH)2]和微胶囊红磷（MRP）为阻燃剂制备了无卤阻燃乙烯-醋酸乙烯共聚物（EVA）复合材料。通过极限氧指数、热失重分析和力学性能研究了硅酸盐纳米短纤维 (SNF) 以及马来酸酐接枝乙烯-醋酸乙烯共聚物（EVA-g-MAH）的加入对EVA阻燃性能和力学性能的影响，并通过扫描电子显微镜对其断面形貌和残炭表面形貌进行了观察和分析。结果表明，加入适量的EVA-g-MAH可以提高复合材料的极限氧指数和力学性能，加入12份的EVA-g-MAH后，材料的拉伸强度可达到10.2 MPa，断裂伸长率达到521 %，极限氧指数为39%，垂直燃烧达到V-0级别；加入适量的SNF后，可以显著提高复合材料的拉伸强度，当添加20份的SNF后，复合材料各性能最优，拉伸强度为12.3 MPa，断裂伸长率为210 %，极限氧指数为38%，垂直燃烧达到V-0级别。

Flame Retardancy and Mechanical Property of Silicate Nanofiber Reinforced EVA Composites

The non-halogen flame retardant EVA composite containing magnesium hydroxide Mg(OH)2] and microencapsulated red phosphorus (MRP) was prepared. EVA-g-MAH and silicate nanofiber (SNF) have also been used to improve the flame retardancy and mechanical property of EVA. Limiting oxygen index and thermal gravimetric (TG) analysis have been used to characterize the flammability and thermal behavior of EVA composites. The morphology of the composite has been observed and analyzed by SEM. It was found that the presence of EVA-g-MAH could improve the limiting oxygen index and mechanical properties. The composite containing 12 phr EVA-g-MAH has a limiting oxygen index value of 39% , the tensile strength of 10.2 MPa and the elongation at break of 521 % . When the loading of SNF was 20 phr, the limiting oxygen index reached 38%, the horizontal flame test reached V-0 level, the tensile strength reached 12.3 MPa, and the elongation at break reached 210 %.