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Syntheses and Catalytic Capability of Novel Transition Metal Catalysts Bearing P^N^O Ligands for Olefin Polymerization

Author: ZhangWenJie
Tutor: ChenJianXin
School: Fujian Normal University
Course: Physical and chemical
Keywords: P^N^O ligand Catalytic activity Norbornene Ethylene Polymerization Oligomerization Nickel Cobalt
CLC: O643.36
Type: Master's thesis
Year: 2008
Downloads: 23
Quote: 1
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Abstract


In this thesis, the two P^N^O ligands (L1 and L2) , and their corresponding nickel and cobalt complexes cat1、cat2、cat3、cat4、cat5、cat6 and cat7、cat8 were successfully synthesized and characterized by IR and element analysis. The X-ray single crystal diffraction was used to determine the molecular structure of cat1、cat2、cat3、cat5. Nickel complexes were used to catalyse norbornene polymerization under methylaluminoxane (MAO) activation, showing high acitivities. The research was showed the variety of halogens which connect with center metal has not greatly influence on the catalyst activities but the big groups of ligands do so. It was showed that the polymerization conditions, such as different catalysts, Al/Ni ratio, reaction temperature, reaction time, different solvents, monomer concentration and catalyst concentration, had great effects on the catalytic activities and the viscid average molecular weight of polynorbornene (PNB). The characterization of the polymers showed PNB was formed by vinyl-type polymerization, with high thermal stability and none-crystalline structure. The research also showed nickel complexes can catalyse ethylene oligomerization, styrene polymerization, but the polymerization activities were low. And cobalt complexes were used to catalyse ethylene oligomerization, styrene and norbornene polymerization under methylaluminoxane (MAO) activation , showing low acitivities.In addition, the three N^O ligands L3、L4 and L5 were also synthesized and characterized by IR and element analysis. The X-ray single crystal diffraction was used to determine their molecular structures, and we try to synthesize their relative complexes.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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