新型吡啶双亚胺铁催化乙烯聚合反应

Polymerization of Ethylene Catalyzed by Novel 2,6-Bis(Imino) Pyridine Iron(Ⅱ) Complex

合成并表征了一种新型吡啶双亚胺铁烯烃聚合催化剂2,6-二[1-(4-羟基-2,6-二甲基苯胺)乙基]吡啶氯化铁(1a)。结果表明,在亚胺环的对位引入羟基,可同时提高催化剂的活性和聚合物的分子量。在改性甲基铝氧烷(MMAO)的活化下,该催化剂引发乙烯聚合的活性(以单位时间(h)molFe引发乙烯聚合的PE质量(g)来表征)可达到6.78×106g/(mol.h),明显高于催化剂2,6-二[1-(2,6-二甲基苯胺)乙基]吡啶氯化铁(1b),且能得到更高分子量的聚乙烯。

A novel 2,6-bis ylimino） ethyl ] pyridine iron （imino） pyridine iron （Ⅱ） complex （ 2,6-bis chloride,1a） was synthesized and investigated [ 1- （4-hydroxy-2,6-dimethylphenas a catalyst for ethylene polymerization in the presence of modified methylaluminoxane as a cocatlyst. The new iron complex displays higher catalytic activity and increases higher molecular mass polyethylene than 2,6-bis [ 1-（2,6-dimethylphenylimino） ethyl] pyridine iron chloride lb under the identical conditions. The novel complex la shows a very high activit（ polyethylene mass catalyized by one molar catalyst in one hour） ：6. 78 ×10^6 g/（mol ·h）.