制备了一种含有胺基官能团的α-二亚胺镍配合物,并将该配合物负载在AlEt3改性的SiO_2-MgCl_2复合载体上制备负载催化剂,不用昂贵的MAO(甲基铝氧烷)而用AlEt_2Cl作助催化剂,研究了其对乙烯的聚合性能.并采用高温~(13)CNMR、高温GPC、差示扫描量热法(DSC)等对得到的聚合物进行了研究.结果发现,该催化剂具有很高的催化活性(1.89×10~6g of PE/mol of Ni h),得到的聚乙烯产品含有各种短支链(甲基、乙基、丙基、丁基)和长支链,分子量在2.15×10~5～9.27×10~5之间,分子量分布为3.12～4.23.
In this thesis, the amino-functionalized (α-diimine) nickel complex bis(4-(4-amine-3, 5-diisopropylbenzyl)-2, 6-diisopropylphenylimino)acenaphthene NiBr_2 was synthesized. Then they supported on the support of composition SiO_2-MgCl_2 which was prepared by reaction of SiO_2-MgCl_2/ethanol-adduct with aluminum alkyl. The supported catalyst was used for ethylene polymerizations with inexpensive general alkylaluminum compounds as cocatalyst. With variation of polymerization temperatures, the different morphologic products were obtained. The resultant PE was confirmed by ~(13)C-NMR to contain significant amounts of methyl, ethyl, propyl,butyl, amyl, and long branches(longer than six carbons). According to high temperature GPC, the number-average molecular weights of the polymers obtained ranged from 2.15×10~5 to 9.27×10~5 and polydispersities ranged from wide(MWD =3.12～4.23).
参考文献
| [1] | Jiang HL;Wu Q;Zhu FM;Wang HH .Preparation of highly branched polyethylene using (alpha-diimine) nickel complex covalently supported on modified SiO2[J].Journal of Applied Polymer Science,2007(3):1483-1489. |
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