Preparation and properties of PVAc-nano-OMMT/PP-EVA composite
-
摘要: 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。Abstract: The in suit intercalated polymerization of vinyl acetate (VAc) and organophilic montmorillonite (OMMT) was initiated via emulsion polymerization and obtained polyvinylacetate (PVAc)-nano-OMMT hybrid. Twofold blend composed of PVAc-nano-OMMT/PP-EVA was prepared by twin-screw extruder way, and X-ray diffraction (XRD) result shows that the structure of PVAc-nano-OMMT/PP-EVA is be treated as exfoliated nanocomposite structure during application of higher shear stress to system, and transmission electron microscopy (TEM) observation gives the same result directly. Thermo gravimetric analysis (TGA) results show that the initial decomposition temperature of PVAc-nano-OMMT/PP-EVA is greater than that of PP-EVA and nano-OMMT/PP-EVA , the existence of PVAc-nano-OMMT makes composite better thermal stability. In the PVAc-nano-OMMT/PP-EVA composite, PVAc-nano-OMMT has better toughness. Limiting oxygen index (LOI) and cone calorimeter test indicate that LOI of PVAc-nano-OMMT/PP-EVA is 24.1%, and has lower heat release rate, effective heat of combustion, smoke release course, and better flame retardancy.
-
点击查看大图
计量
- 文章访问数: 2014
- PDF下载量: 813
- 被引次数: 0
下载:
