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 α-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).