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Methylene‐bridged bis(8‐arylimino)‐5,6,7‐trihydro‐quinolylinickel precatalysts for ethylene polymerization
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-05-22 , DOI: 10.1002/pol.20200195 Hongyi Suo 1 , Qiang Chen 1 , Wenjuan Zhang 1, 2 , Yanping Ma 1 , Wen‐Hua Sun 1, 3
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-05-22 , DOI: 10.1002/pol.20200195 Hongyi Suo 1 , Qiang Chen 1 , Wenjuan Zhang 1, 2 , Yanping Ma 1 , Wen‐Hua Sun 1, 3
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A series of binuclear nickel complexes bearing N‐(5,6,7‐trihydroquinolin‐8‐ylidene)amino CH(C6H4‐4‐R2){4‐C6H2‐2,6‐R12N‐(C5H3NC4H6)}2 [R1 = Me, R2 = OH L1, R1 = Et, R2 = OH L2, R1 = Me, R2 = H L3, R1 = Me, R2 = OCH3L4] has been synthesized and characterized. In the presence of either methylaluminoxane (MAO) or Et2AlCl, all nickel complexes exhibited high activities up to 3.33 × 106 g (PE)·mol−1(Ni)·hr−1 toward ethylene polymerization, producing high branched polyethylenes (PEs). The aluminum cocatalysts have significantly affected the properties of resultant PE; with MAO as the cocatalyst, the resultant PE shows higher molecular weight and possesses only one Tm value, meanwhile Et2AlCl as the cocatalyst, the obtained PE indicates lower molecular weight and two melting points. The microstructures of those PEs determined by their 13C NMR spectra illustrate the similar densities but different types of branches, in which the PE obtained with Et2AlCl shows high methyl branch selectivity (>80%), and the PE produced by MAO has 50% methyl and another half of longer branches. The branched PEs are consistent to the chain migration happened in the ethylene polymerization.
中文翻译：
用于乙烯聚合的亚甲基桥双（8-芳基氨基）-5,6,7-三氢喹啉镍预催化剂
一系列双核镍配合物的轴承ñ - （5,6,7- trihydroquinolin -8-亚基）氨基CH（C 6 H ^ 4 -4-R 2）{4-C 6 H ^ 2 -2,6-R 1 2 N-（C 5 H 3 NC 4 H 6）} 2 [R 1 = Me，R 2 = OH L1，R 1 = Et，R 2 = OH L2，R 1 = Me，R 2 = H L3，R 1 =我R 2= OCH 3 L4 ]已被合成和表征。在甲基铝氧烷（MAO）或Et 2 AlCl的存在下，所有镍络合物对乙烯聚合均表现出高达3.33×10 6 g（PE）·mol -1（Ni）·hr -1的高活性，从而生产出高支链聚乙烯（ PE）。铝助催化剂极大地影响了所得PE的性能。以MAO为助催化剂，得到的PE表现出较高的分子量，仅具有一个T m值，而以Et 2 AlCl为助催化剂，得到的PE具有较低的分子量和两个熔点。这些PE的微观结构取决于它们的13 C NMR谱图显示了相似的密度，但支链类型不同，其中用Et 2 AlCl获得的PE表现出较高的甲基支链选择性（> 80％），而MAO生产的PE具有50％的甲基和另一半较长的支链。支链PE与乙烯聚合中发生的链迁移一致。
更新日期：2020-05-22
中文翻译：
用于乙烯聚合的亚甲基桥双（8-芳基氨基）-5,6,7-三氢喹啉镍预催化剂
一系列双核镍配合物的轴承ñ - （5,6,7- trihydroquinolin -8-亚基）氨基CH（C 6 H ^ 4 -4-R 2）{4-C 6 H ^ 2 -2,6-R 1 2 N-（C 5 H 3 NC 4 H 6）} 2 [R 1 = Me，R 2 = OH L1，R 1 = Et，R 2 = OH L2，R 1 = Me，R 2 = H L3，R 1 =我R 2= OCH 3 L4 ]已被合成和表征。在甲基铝氧烷（MAO）或Et 2 AlCl的存在下，所有镍络合物对乙烯聚合均表现出高达3.33×10 6 g（PE）·mol -1（Ni）·hr -1的高活性，从而生产出高支链聚乙烯（ PE）。铝助催化剂极大地影响了所得PE的性能。以MAO为助催化剂，得到的PE表现出较高的分子量，仅具有一个T m值，而以Et 2 AlCl为助催化剂，得到的PE具有较低的分子量和两个熔点。这些PE的微观结构取决于它们的13 C NMR谱图显示了相似的密度，但支链类型不同，其中用Et 2 AlCl获得的PE表现出较高的甲基支链选择性（> 80％），而MAO生产的PE具有50％的甲基和另一半较长的支链。支链PE与乙烯聚合中发生的链迁移一致。
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