Zong Kening, Hou Yanhui, Zhao Xiaobei, Sun Yali, Liu Binyuan, Yang Min
Hebei Key Laboratory of Functional Polymers, Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
State Key Laboratory of Separation Membranes and Membrane Processes, School of Material Science and Engineering, Tiangong University, Tianjin 300160, China.
Polymers (Basel). 2022 Sep 5;14(17):3684. doi: 10.3390/polym14173684.
Four supported α-diimine nickel(II) catalysts covalently linked to silica via hydroxyl functionality on α-diimine acenaphthequinone-backbone were prepared and used in slurry polymerizations of ethylene to produce branched polyethylenes. The catalytic activities of these still reached 10 g/molNi·h at 70 °C. The life of the supported catalyst is prolonged, as can be seen from the kinetic profile. The molecular weight of the polyethylene obtained by the 955 silica gel supported catalyst was higher than that obtained by the 2408D silica gel supported catalyst. The melting points of polyethylene obtained by the supported catalysts S-C1-a/b are all above 110 °C. Compared with the homogeneous catalyst, the branching numbers of the polyethylenes obtained by the supported catalysts S-C1-a/b is significantly lower. The polyethylenes obtained by supported catalyst S-C1-a/b at 30-50 °C are free-flowing particles, which is obviously better than the rubber-like cluster polymer obtained from homogeneous catalyst.
制备了四种通过苊醌骨架上的羟基官能团与二氧化硅共价连接的负载型α-二亚胺镍（II）催化剂，并将其用于乙烯淤浆聚合以制备支化聚乙烯。在70°C下，这些催化剂的催化活性仍达到10 g/molNi·h。从动力学曲线可以看出，负载型催化剂的寿命得以延长。955硅胶负载催化剂得到的聚乙烯分子量高于2408D硅胶负载催化剂得到的聚乙烯分子量。负载型催化剂S-C1-a/b得到的聚乙烯熔点均高于110°C。与均相催化剂相比，负载型催化剂S-C1-a/b得到的聚乙烯支化数明显更低。负载型催化剂S-C1-a/b在30-50°C下得到的聚乙烯为自由流动颗粒，明显优于均相催化剂得到的橡胶状簇状聚合物。
