合成了三个在苯氧基环[Cl(1),Br(2),I(3)]上带有邻卤化物取代基的氟化双(苯氧基-亚胺)钛配合物,表征并评价为乙烯聚合的预催化剂在大气压下用甲基铝氧烷(MAO)清洗。这些C 2对称催化剂对乙烯聚合反应具有高活性,可生产超高分子量聚乙烯(UHMWPE)(M W > 3,000,000)。窄分子量分布证明存在活性聚合。这些催化剂的活性性质归因于亚胺氮附近的氟原子与聚合物链的β-氢的相互作用,从而抑制了β-氢的转移。对于使用络合物2的聚合反应,在11.65 kg PE / mmol cat h下观察到最高活性。与配合物1相比,更大体积的溴取代基可以在阳离子活性物质和阴离子助催化剂之间引起有效的离子对分离,从而产生更高的聚合速率。但是,对于复数3 如果使用碘取代基,金属中心的空间拥塞的增加会导致聚合活性降低。
合成了三个在苯氧基环[Cl(1),Br(2),I(3)]上带有邻卤化物取代基的氟化双(苯氧基-亚胺)钛配合物,表征并评价为乙烯聚合的预催化剂在大气压下用甲基铝氧烷(MAO)清洗。这些C 2对称催化剂对乙烯聚合反应具有高活性,可生产超高分子量聚乙烯(UHMWPE)(M W > 3,000,000)。窄分子量分布证明存在活性聚合。这些催化剂的活性性质归因于亚胺氮附近的氟原子与聚合物链的β-氢的相互作用,从而抑制了β-氢的转移。对于使用络合物2的聚合反应,在11.65 kg PE / mmol cat h下观察到最高活性。与配合物1相比,更大体积的溴取代基可以在阳离子活性物质和阴离子助催化剂之间引起有效的离子对分离,从而产生更高的聚合速率。但是,对于复数3 如果使用碘取代基,金属中心的空间拥塞的增加会导致聚合活性降低。
The synthesis and X-ray structure of a phenoxyimine catalyst tailored for living olefin polymerisation and the synthesis of ultra-high molecular weight polyethylene and atactic polypropylene
5′-diiodo-salicylidene)-2,6-difluoroaniline)-titanium(IV)-dichloride has been synthesised. The ligand as well as the complex have been fully characterised. An X-ray structure of the titanium complex was obtained. After activation with MAO, it was used as highly active catalyst in living olefin polymerisation of ethylene and propylene. Ultra-high molecular weight polyethylene and atactic polypropylene of
作者:Robert L. Jones、Mahmoud Z. Armoush、Tjhunina Harjati、Michael Elder、Albert A. Hummel、Jeffrey Sullivan
DOI:10.1016/j.ica.2010.08.050
日期:2010.12
Classic inorganic and more recent organometallic compounds capable of polymerizing ethylene to ultra high molecular are compared. Activated catalysts showed varying degrees of productivity when challenged with co-monomers. The general activity trend followed TiCl3 < Mg/Si-TiCl3 < metallocenes. A new phenoxyimine catalyst complex N-(3,5-diiodosalicylidene) cycloheptylamine titanium dichloride was useful in making UHMWPE and compared to previously reported phenoxyimine catalyst structures capable of living polyolefin polymerizations. (C) 2010 Elsevier B. V. All rights reserved.