An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene poly...An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and theeffects of polymerization conditions such as temperature, aluminum/iron molar ratio on the activity of catalyst and thecharacteristics of polyethylene were reported. The unsymmetric catalyst 1' has a good catalytic performance of 3.47×10~6 gPE·mol^(-1)·Fe·h^(-1) at 40℃ with aluminum/iron molar ratio = 2500. A dependence of catalyst activity on themethylaluminoxane (MAO) concentration and reaction temperature was found. The molecular weight (MW) of polyethylenewith broad dispersity is about 10~4-10~5 g/mol. The melting temperature and branching of polyethylenes vary with changingreaction temperature and aluminum/iron molar ratio.展开更多
A series of new complexes {2,6-bis[1-((2-methyl-4-methoxyphenyl)imino)ethyl]pyri-dine}MCI2 [M=Fe(Ⅱ) (2), Co(Ⅱ) (3), Ni(Ⅱ) (4), Cu(Ⅱ) (5), Zn(Ⅱ) (6)] have been synthesized. At 25℃, using 500 equiv of methylalumin...A series of new complexes {2,6-bis[1-((2-methyl-4-methoxyphenyl)imino)ethyl]pyri-dine}MCI2 [M=Fe(Ⅱ) (2), Co(Ⅱ) (3), Ni(Ⅱ) (4), Cu(Ⅱ) (5), Zn(Ⅱ) (6)] have been synthesized. At 25℃, using 500 equiv of methylaluminoxane (MAO), the activities of Fe(Ⅱ), Co(Ⅱ) catalysts can reach 4.02×106 g/mol-Fehatm for ethylene polymerization and 3.98×105 g/mol-Cohatm for ethylene oligomerization. The effects of polymerization conditions such as reaction temperature, Al/M molar ratio and time on the activity of catalyst have been explored.展开更多
(1,4-Bis-（4-bromobenzoyl）benzene) as the monomer has been synthesized and characterized by Friedel-Crafts benzoylation reaction.Novel poly（imino ketone）s（PIKs） as high performance polymers have been obtained by ...(1,4-Bis-（4-bromobenzoyl）benzene) as the monomer has been synthesized and characterized by Friedel-Crafts benzoylation reaction.Novel poly（imino ketone）s（PIKs） as high performance polymers have been obtained by the condensation polymerization of（1,4-bis-（4-bromobenzoyl）benzene） and aromatic diamines via palladium-catalyzed aryl amination reaction.The strcture of PIKs is characterized by means of FT-IR and（）1H-NMR spectroscopy,and the results show an agreement with the proposed structure.DSC and TG measurements show that PIKs possess high glass transition temperature（Tg>230℃） and good thermal stability with high decomposition temperatures（TD>500℃）.PIKs also exhibit the excellent solubility,PIK-3 can be dissolved in common organic solvent CHCl3 at room temperature（20℃）.展开更多
Two new carbonyl manganese compounds were obtained by reactions of 2.6-di(biphenylphosphine) pyridine (PNP) with CpMn(CO)(3). The structures of the compounds were confirmed by elemental analysis, IR, H-1 NMR and P-31 ...Two new carbonyl manganese compounds were obtained by reactions of 2.6-di(biphenylphosphine) pyridine (PNP) with CpMn(CO)(3). The structures of the compounds were confirmed by elemental analysis, IR, H-1 NMR and P-31 NMR. The results showed that the mixed-donor ligand (PNP) was coordinated to manganese only through the phosphorus atom.展开更多
基金This work was financially supported by the National Natural Science Foundation of China (No. 29734141, 50103012) Core Research for Engineering Innovation KGCX2-203, the Foundation of "One Hundred Talents" program for W-H Sun, Chinese Academy of Sciences
文摘An unsymmetric 2,6-bis(imino)pyridine iron(II) complex 1' was synthesized. The relationship between catalyststructure and its activity in ethylene polymerization is discussed. The kinetic behavior of ethylene polymerization and theeffects of polymerization conditions such as temperature, aluminum/iron molar ratio on the activity of catalyst and thecharacteristics of polyethylene were reported. The unsymmetric catalyst 1' has a good catalytic performance of 3.47×10~6 gPE·mol^(-1)·Fe·h^(-1) at 40℃ with aluminum/iron molar ratio = 2500. A dependence of catalyst activity on themethylaluminoxane (MAO) concentration and reaction temperature was found. The molecular weight (MW) of polyethylenewith broad dispersity is about 10~4-10~5 g/mol. The melting temperature and branching of polyethylenes vary with changingreaction temperature and aluminum/iron molar ratio.
基金supported by the Chinese Academy of Sciences,the National Natural Science Foundation of China(Grant No.20371039)National Basic Research Program(the 973 Program,No.2003CB214600)+1 种基金the Key Laboratory Research and Establishment Program of Shaanxi Education Section(No.03JS006)the Natural Science Foundation of Shaanxi Province(Grant No.04JK143).
文摘A series of new complexes {2,6-bis[1-((2-methyl-4-methoxyphenyl)imino)ethyl]pyri-dine}MCI2 [M=Fe(Ⅱ) (2), Co(Ⅱ) (3), Ni(Ⅱ) (4), Cu(Ⅱ) (5), Zn(Ⅱ) (6)] have been synthesized. At 25℃, using 500 equiv of methylaluminoxane (MAO), the activities of Fe(Ⅱ), Co(Ⅱ) catalysts can reach 4.02×106 g/mol-Fehatm for ethylene polymerization and 3.98×105 g/mol-Cohatm for ethylene oligomerization. The effects of polymerization conditions such as reaction temperature, Al/M molar ratio and time on the activity of catalyst have been explored.
文摘(1,4-Bis-（4-bromobenzoyl）benzene) as the monomer has been synthesized and characterized by Friedel-Crafts benzoylation reaction.Novel poly（imino ketone）s（PIKs） as high performance polymers have been obtained by the condensation polymerization of（1,4-bis-（4-bromobenzoyl）benzene） and aromatic diamines via palladium-catalyzed aryl amination reaction.The strcture of PIKs is characterized by means of FT-IR and（）1H-NMR spectroscopy,and the results show an agreement with the proposed structure.DSC and TG measurements show that PIKs possess high glass transition temperature（Tg>230℃） and good thermal stability with high decomposition temperatures（TD>500℃）.PIKs also exhibit the excellent solubility,PIK-3 can be dissolved in common organic solvent CHCl3 at room temperature（20℃）.
文摘Two new carbonyl manganese compounds were obtained by reactions of 2.6-di(biphenylphosphine) pyridine (PNP) with CpMn(CO)(3). The structures of the compounds were confirmed by elemental analysis, IR, H-1 NMR and P-31 NMR. The results showed that the mixed-donor ligand (PNP) was coordinated to manganese only through the phosphorus atom.
