LONG-CHAIN HIGHLY BRANCHED POLYETHYLENE PREPARED WITH BINARY α-DIIMINE NICKEL/MAO CATALYSTS
نویسندگان
چکیده
منابع مشابه
Synthesis of Highly Branched Polyolefins Using Phenyl Substituted -Diimine Ni(II) Catalysts
A series of α-diimine Ni(II) complexes containing bulky phenyl groups, [ArN = C(Naphth)C = NAr]NiBr2 (Naphth: 1,8-naphthdiyl, Ar = 2,6-Me2-4-PhC6H2 (C1); Ar = 2,4-Me2-6-PhC6H2 (C2); Ar = 2-Me-4,6-Ph2C6H2 (C3); Ar = 4-Me-2,6-Ph2C6H2 (C4); Ar = 4-Me-2-PhC6H3 (C5); Ar = 2,4,6-Ph3C6H2 (C6)), were synthesized and characterized. Upon activation with either diethylaluminum chloride (Et2AlCl) or modifi...
متن کاملPersistence Length of Short-Chain Branched Polyethylene
The effect of short-chain branching (SCB) on the persistence length lp of polyethylene (PE) was studied using small-angle neutron scattering (SANS). In thermodynamically good solvents, lp can be measured directly from the scattering vector qtr at the crossover from good solvent mass-fractal scaling to the rodlike persistent scaling, using the unified equation described in the text. The method w...
متن کاملSynthesis and application of binuclear α-diimine nickel/palladium catalysts with a conjugated backbone.
A series of binuclear nickel/palladium catalysts C4-C7 with conjugated α-diimine ligands were designed, prepared and fully characterized. The binuclear nickel complexes C6 and C7 were activated by modified methylalumoxanes (MMAO) to generate highly active ethylene polymerization catalysts with activities up to 1050 kg [mol (Ni) h](-1). The activity of C7 is twice that of the mononuclear analogu...
متن کاملDirect Synthesis of Branched Carboxylic Acid Functionalized Poly(1-octene) by -Diimine Palladium Catalysts
In this work, we studied propylene polymerization using some α-diimine palladium catalysts with systematically varied ligand sterics. In propylene polymerization, the ligand steric effect exhibits significant variations on the catalytic activity, polymer molecular weight, and branching density. However, the regio control for the polymer microstructure is poor. Furthermore, copolymerization of 1...
متن کاملImportance of co-donor field strength in the preparation of tetradentate α-diimine nickel hydrosilylation catalysts.
Although bis(α-diimine)Ni complexes were prepared when amine-substituted chelates were added to Ni(COD)2, the incorporation of strong-field phosphine donors allowed the isolation of (κ(4)-N,N,P,P-DI)Ni hydrosilylation catalysts. The crystallographic investigation of two different (κ(4)-N,N,P,P-DI)Ni compounds revealed that the geometry about nickel influences the observed degree of α-diimine re...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Polymerica Sinica
سال: 2006
ISSN: 1000-3304
DOI: 10.3724/sp.j.1105.2006.00225