A-diimine Nickel Catalyzed Olefin Polymerization And Composite Materials Research

Graphene has good advantages of high specific surface area,conductivity,streng-th and the mechanical,thermal,optical.It is the formation of network association structure when based on as a filler or unit with polymer complex.We can get stability,strength and flame retardant polymer cornerstone ink olefin composites by modifying the original material.All kinds of the research literature on polyethylene/graphene especially the three-dimensional foamy graphene is less.First we use the a-diimine transition metal catalyst which is senior did in the last year to catalyze ethylene and hexene polymerization.The polyolefin composite with three-dimensional foamy grapheme which get polyolefin/graphene composites in the end.The tests show that each performance is increase compare with pure polyolefin.Moreover,polyethylene/20wt%graphene conductivity is the highest in polyethylene/graphene composites which is 0.15S/m and polyethylene/5wt%graphene tensile strength is the highest in polyethylene/graphene composites which is 8.3MPa.And polyhexene/20wt%graphene conductivity in polyhexene/graphene is highest which is 0.21 S/m and polyhexene/10wt%graphene tensile strength in polyhexene/graphene is highest which is 6.3MPa.The three-dimensional geometric structure of N,N-bis(2,6-diisopropyl)-2,6-ditertiarybutylanthraceneene-11,12-diimine bromide nickel catalyst(Cat3)is synthesized successfully by changing the naphthalene ring with different substituents.Then we studi-ed the Cat3 catalyze polymerization of ethylene in the different catalytic conditions like cocatalysts,pressure and temperature.As a result,it is in the 0.5Mpa,70?,DEAC as the cocatalyst that possess the largest catalytic activity which is 4.84×105 gPE/(mol·Ni·h).We synthesized four ?-diimine ligands by changing the substituent(phenyl hydroxylphenyl,aminophenyl and hydroxymethyl-phenyl)on acenaphthene skeleton.Then get N,N-bis(2,6-diisopropylphenyl)-5,6-bis(4-hydroxyphenyl)acenaphthylene-1,2-diimine bromide nickel catalyst(Cat4)and N,N-bis(2,6-diisopropylphenyl)-5,6-bis(4-hydroxymethylphenyl)acenaphthylene-1,2-diimine bromide nickel catalyst(Cat5)and explore the catalytic activity in the 0.5MPa,DEAC as the cocatalyst,different catalytic polymerization of ethylene polymerization temperature.They are in the 50? that possess the largest catalytic activity which are 3.72×106gPE/(mol·Ni·h)and 3.84×106gPE/(mol·Ni·h).By changing the substituent on the imine ligand,we synthesize the late transition metal catalyst of N,N-bis(2,6-benzyl-4-methyl)-5,6-bis(4-hydroxymethylphenyl)acenaphthylene-1,2-diimine brominated nickel catalyst(Cat6)and explore catalytic conditions like DEAC as the cocatalyst,0.5MPa,different polymerization temperature polymerization.It is in the 80? that possess the largest catalytic activity which is 4.66×106gPE/(mol·Ni·h).