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首页> 外文期刊>Macromolecular reaction engineering >Polyethylene Nanocomposites Obtained by in situ Polymerization via a Metallocene Catalyst Supported on Silica Nanospheres
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Polyethylene Nanocomposites Obtained by in situ Polymerization via a Metallocene Catalyst Supported on Silica Nanospheres

机译：通过二氧化硅纳米球上负载的茂金属催化剂原位聚合获得的聚乙烯纳米复合材料

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Polyethylene (PE) nanocomposites were produced through in situ polymerization using bis(n-butylcyclopentadienyl) zirconium dichloride (nBuCp)_2ZrCl_2 supported on silica nanospheres (SN) with diameters of 80-100 nm synthesized by the sol-gel method. The metallocene catalyst was either supported directly on the SN or on SN pretreated with methylaluminoxane (MAO). The effect of zirconium loading on the catalytic behavior and polymer properties was studied. High catalytic activities, comparable with homogeneous polymerizations, were found when the metallocene catalyst was supported directly on the SN. The catalytic activity was lower when the catalyst was supported on the MAO-treated SN. The molecular weight of the PEs obtained using the supported systems were 40% higher than homogeneous system. TEM images show that the nanospheres were well dispersed throughout the PE matrix. There was a significant improvement in the morphology of the polymer particles for support systems.
机译：聚乙烯（PE）纳米复合材料是通过原位聚合反应制备的，使用的是通过溶胶-凝胶法合成的直径为80-100 nm的二氧化硅纳米球（SN）上负载的二氯化双（正丁基环戊二烯基）二氯化锆（nBuCp）_2ZrCl_2。茂金属催化剂直接负载在SN上或用甲基铝氧烷（MAO）预处理的SN上。研究了锆负载量对催化性能和聚合物性能的影响。当茂金属催化剂直接负载在SN上时，发现了与均相聚合相当的高催化活性。当催化剂负载在经MAO处理的SN上时，催化活性较低。使用支持体系获得的PE的分子量比均质体系高40％。 TEM图像表明，纳米球在整个PE基质中分散良好。用于载体系统的聚合物颗粒的形态显着改善。

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