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利用乳液聚合法引发醋酸乙烯酯(VAc)在有机蒙脱土(OMMT)中原位插层聚合,与聚丙烯(PP)-乙烯-醋酸乙烯酯共聚物(EVA)复合体系熔融共挤制备出PVAc-nano-OMMT/PP-EVA复合材料。X射线衍射(XRD)与透射电镜(TEM)测试结果表明,在强剪切作用下,PVAc-nano-OMMT/PP-EVA形成了剥离型纳米复合材料结构;热失重(TGA)测试结果显示PVAc-nano-OMMT/PP-EVA的起始分解温度明显高于PP-EVA和nano-OMMT/PP-EVA,PVAc-nano-OMMT的存在使材料的热性能得以改善;在PVAc-nano-OMMT/PP-EVA共混物中,PVAc-nano-OMMT具有明显的增韧作用;通过氧指数(LOI)和锥形量热(CONE)测试,PVAc-nano-OMMT/PP-EVA的氧指数为24.1%,可较大幅度地降低材料燃烧的热释放程度、有效燃烧热和烟释放过程,阻燃性能提高。
Polymerization of vinyl acetate (VAc) in organic montmorillonite (OMMT) was initiated by emulsion polymerization and PVAc was prepared by melt co-extrusion with polypropylene (PP) -ethylene-vinyl acetate copolymer -nano-OMMT / PP-EVA composites. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results show that the PVAc-nano-OMMT / PP-EVA forms a peel-off nanocomposite structure under strong shear stress. The initial decomposition temperature of -nano-OMMT / PP-EVA was significantly higher than that of PP-EVA and nano-OMMT / PP-EVA. The thermal properties of PVAc-nano-OMMT / PP- The oxygen index of PVAc-nano-OMMT / PP-EVA was 24.1 by means of LOI and CONE test. %, Which can greatly reduce the degree of heat release material combustion, effective combustion heat and smoke release process, flame retardant properties.