MMT/SiO_2复合载体制备聚乙烯纳米复合材料的探索研究

Research and Investigation of Prepared Polyethylene Nanocomposites Using Complex Carrier of MMT/SiO_2

制备了柱撑结构蒙脱石(MM T)/S iO2复合载体,MM T层间距达3.3 nm,载体比表面积≥720 m2/g。将M gC l2/T iC l4/THF负载于此载体上制备聚乙烯催化剂,活性为30 g^40 g产品/g催化剂,填充量为2.5%~3.0%,此活性的纳米复合材料是一种添加剂,可满足填充聚合物使用要求。以TEM、XRD、DSC等技术研究复合材料结构性能关系及MM T对其结晶熔融行为的影响。结果表明,MM T片层以剥离型和插层型纳米尺度共存,片层均匀分散于聚乙烯中,所得纳米复合材料力学性能比普通复合材料有所提高。

Pillared montmorillonite（MMT）/silica complex carrier with MMT interlayer distance up to 3.3 nm, and specific surface area ≥720 m^2/g was prepared. Via this complex carrier, MgCl2/TiCl4/THF active components were carried to form the catalysts with activity of 30 g-40 g yield/g cat. or MMT filling is 2. 5%-3.0% by mass. MMT in the nanocomposites serves an additive to fill PE. The structure and properties of the nanocomposites were investigated by TEM, XRD and DSC etc. and the effects of MMT on the crystalline and melt behaviors were analyzed. Results show that there coexist the exfoliated and intercalated layer dispersion of MMT in the polyethylene MMT nanocomposites with homogeneous layer dispersion. The mechanical properties of the prepared nanocomposites based on this catalyst are improved better than that of the common ones.