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首页> 外文期刊>Organometallics >Nickel Catalysts Activated by rGO Modified with a Boron Lewis Acid To Produce rGO-Hyperbranched PE Nanocomposites
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Nickel Catalysts Activated by rGO Modified with a Boron Lewis Acid To Produce rGO-Hyperbranched PE Nanocomposites

机译：由RGO激活的镍催化剂用硼路易斯酸改性，以产生RGO - 超支化的PE纳米复合材料

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摘要

The synthesis, characterization, and ethylene reactivity of a nickel-activated alpha-cyano-beta-ketoiminate complex with B(C6F5)(3) is reported. The X-ray diffraction studies of the Ni complex 1 revealed that a weak interaction between the distal aryl rings of the N-terphenyl moiety could be responsible for the low molecular weights and highly branched microstructure of the polyethylene compounds. In addition, a supported single-site Lewis acid based on reduced graphene oxide, rGO-O-B(C6F5)(2), was used, and we studied its ability to activate complex 1 for the generation of polyethylene/reduced graphene oxide nanocomposites. The supported catalyst rGO-B(C6F5)(2)-Ni-CN exhibited an ethylene polymerization activity that was approximately 2 times greater than that of the unsupported system. Meanwhile, the microstructure of the polyethylene nanocomposites was analyzed by C-13 NMR, revealing the presence of a low molecular weight and hyperbranched motif due to the presence of sec-butyl groups. These results indicated that the graphene support actively participated in the polymerization process. The morphological examinations of the nanocomposites by TEM revealed the effective exfoliation and good dispersion of rGO in the polymer matrix at the nanoscale level.
机译：报道的合成，表征，和乙烯的镍活化α-氰基-β-酮亚胺化物复合物与B（C 6 F 5）（3）的反应性。镍配合物1的X射线衍射研究显示，在N三联苯基部分的远端的芳环之间的弱相互作用可负责低分子量和高支化聚乙烯化合物的微观结构。此外，负载的单位点的路易斯酸基于还原氧化石墨烯，RGO-O-B（C 6 F 5）（2）中，使用的，我们研究了其能力，以激活复合物1为聚乙烯/还原氧化石墨烯的纳米复合材料的产生。该负载型催化剂RGO-B（C 6 F 5）（2）-Ni-CN表现出的乙烯聚合活性，这是比不支持的系统的大大约2倍。同时，聚乙烯纳米复合材料的微结构通过C-13 NMR分析，揭示一种低分子量和超支化基序的存在由于仲丁基基团的存在。这些结果表明，石墨烯支持积极参与聚合过程。通过TEM的纳米复合材料的形态学检查显示在在纳米级水平的聚合物基质RGO的有效剥离和良好的分散性。

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  • 来源
    《Organometallics》 |2019年第17期|共11页
  • 作者

    Correa Sebastian A.; Daniliuc Constantin G.; Stark H. Sophia; Rojas Rene S.;

  • 作者单位

    Pontificia Univ Catolica Chile Fac Quim Lab Quim Inorgan Casilla 306 Santiago 226094411 Chile;

    Westfalische Wilhelm Univ Organ Chem Inst D-48149 Munster Germany;

    Tech Univ Munich Dept Chem Lichtenbergstr 4 D-85747 Garching Germany;

    Pontificia Univ Catolica Chile Fac Quim Lab Quim Inorgan Casilla 306 Santiago 226094411 Chile;

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  • 正文语种 eng
  • 中图分类 元素有机化合物;
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