科研之友
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摘要
A new strategy was developed to prepare MgCl2-supported nickel-diimine catalysts for ethylene polymerization, in which an amino-functionalized nickel-diimine complex, bis(4-(4-amine-3,5-diisopropylbenzyl)-2,6-diisopropylphenylimino)acenaphtheneNiBr(2) (abbreviaed as NiLBr2), was covalently supported on MgCl2/AlRn(OEt)(3-n). The most significant feature of the supported catalyst is that it polymerizes ethylene with high activities in the presence of inexpensive general alkylaluminum compounds. According to the results of high temperature GPC, the number-average molecular weights of the polymers ranged from 0.35 x 10(6) to 1.08 x 10(6) and the polydispersities ranged from two to three. By modulating the polymerization temperatures, the products of different morphologies were obtained. The resultant PE was confirmed by C-13 NMR to contain significant amounts of not only methyl but also ethyl, propyl, butyl, amyl, and long branches (longer than six carbons).
