以硅胶、甲基铝氧烷、茂金属络合物为原料制备了两种硅胶负载型金属络合物M1和M2,评价了催化乙烯聚合性能,研究了催化聚合动力学,对树脂力学性能进行表征。结果表明,催化乙烯聚合活性为2250~13800 g PE/g Cat,树脂黏均分子量为21×1...以硅胶、甲基铝氧烷、茂金属络合物为原料制备了两种硅胶负载型金属络合物M1和M2,评价了催化乙烯聚合性能,研究了催化聚合动力学,对树脂力学性能进行表征。结果表明,催化乙烯聚合活性为2250~13800 g PE/g Cat,树脂黏均分子量为21×10^(4)~48×10^(4)g/mol。M1催化乙烯聚合动力学活性释放平稳、衰减缓慢,M2呈现出活性快速释放、衰减较快的特点。随着树脂分子量下降,冲击强度、拉伸强度均降低,断裂伸长率上升。展开更多
The seminal report ofα-diimine palladium and nickel catalysts in 1995 represented a major breakthrough in the preparation of functionalized polyolefin materials.Owing to the high abundance and low cost of nickel,nick...The seminal report ofα-diimine palladium and nickel catalysts in 1995 represented a major breakthrough in the preparation of functionalized polyolefin materials.Owing to the high abundance and low cost of nickel,nickel-based catalysts have great application prospects in the industrialization process of olefin coordination polymerization.In this work,various N-aryl substituents with different electronic effects were synthesized and introduced intoα-diimine ligands.The aspreparedα-diimine nickel catalysts showed high polymerization activity(0.9×10^(7)–3.0×10^(7)g·mol^(−1)·h^(−1))in ethylene polymerization,generating polyethylene products with adjustable molecular weights(Mn values:7.4×10^(4)–146.9×10^(4)g·mol^(−1))and branching densities(31/1000 C–68/1000 C).The resulting polyethylene products showed excellent mechanical properties,with high tensile strength(up to 25.0 MPa)and high strain at break values(up to 3890%).The copolymerization of ethylene and polar monomers can also be achieved by these nicekel complexes,ultimately preparing functionalized polyolefins.展开更多
文摘以硅胶、甲基铝氧烷、茂金属络合物为原料制备了两种硅胶负载型金属络合物M1和M2,评价了催化乙烯聚合性能,研究了催化聚合动力学,对树脂力学性能进行表征。结果表明,催化乙烯聚合活性为2250~13800 g PE/g Cat,树脂黏均分子量为21×10^(4)~48×10^(4)g/mol。M1催化乙烯聚合动力学活性释放平稳、衰减缓慢,M2呈现出活性快速释放、衰减较快的特点。随着树脂分子量下降,冲击强度、拉伸强度均降低,断裂伸长率上升。
基金supported by the National Key R&D Program of China(2021YFA1501700)Fundamental Research Funds for the Central Universities(WK9990000142).
文摘The seminal report ofα-diimine palladium and nickel catalysts in 1995 represented a major breakthrough in the preparation of functionalized polyolefin materials.Owing to the high abundance and low cost of nickel,nickel-based catalysts have great application prospects in the industrialization process of olefin coordination polymerization.In this work,various N-aryl substituents with different electronic effects were synthesized and introduced intoα-diimine ligands.The aspreparedα-diimine nickel catalysts showed high polymerization activity(0.9×10^(7)–3.0×10^(7)g·mol^(−1)·h^(−1))in ethylene polymerization,generating polyethylene products with adjustable molecular weights(Mn values:7.4×10^(4)–146.9×10^(4)g·mol^(−1))and branching densities(31/1000 C–68/1000 C).The resulting polyethylene products showed excellent mechanical properties,with high tensile strength(up to 25.0 MPa)and high strain at break values(up to 3890%).The copolymerization of ethylene and polar monomers can also be achieved by these nicekel complexes,ultimately preparing functionalized polyolefins.
