Abstract

The present study aimed to conduct the ethylene polymerization using two binary catalytic systems to evaluate the resulting reactor blend of polyethylene. Subsequently, the study continued to explore the effects of catalyst to monomer molar ratio, reaction temperature, ethylene pressure and nanofillers on the catalysts activity, molar mass, thermal behavior, structural and morphological properties of the obtained polyethylene. The catalytic system containing α-diimine catalyst based on nickel showed higher activity, higher melting point (75.6 × 10⁴ g polyethylene/(mol catalyst h), 125°C, respectively) and the extent of crystallinity (up to 48.5%) in comparison with the analogous system bearing pyridine-imine catalyst. The augmentation of nanoparticles increased the branching content in the system with α-diimine catalyst based on nickel, while these trends were reverse in pyridine-imine catalyst system, so that the branches were reduced as the nanoparticle concentration was increased. SEM images revealed distinct fibrous phases and the presence of obvious and well dispersed nanoparticles in the prepared nanocomposites. The synthesized polyethylene blend exhibited high thermal stability.

中文翻译：

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茂金属/镍二元催化剂的聚乙烯反应器共混物和纳米复合材料

摘要

本研究旨在使用两个二元催化体系进行乙烯聚合反应，以评估聚乙烯的反应混合物。随后，研究继续探索催化剂与单体的摩尔比，反应温度，乙烯压力和纳米填料对所得聚乙烯的催化剂活性，摩尔质量，热行为，结构和形态性能的影响。包含基于镍的α-二亚胺催化剂的催化体系显示出更高的活性和更高的熔点（75.6×10 ⁴与带有吡啶-亚胺催化剂的类似体系相比，聚乙烯/（摩尔催化剂h）（分别为125℃）和结晶度（最高48.5％）。纳米颗粒的增加增加了基于镍的α-二亚胺催化剂在体系中的支化含量，而在吡啶-亚胺催化剂体系中这些趋势相反，因此随着纳米颗粒浓度的增加，分支减少。SEM图像显示了不同的纤维相，并且在制备的纳米复合材料中存在明显且分散良好的纳米颗粒。合成的聚乙烯共混物表现出高的热稳定性。