Abstract: The kinetics of ethylene polymerization initiated by four novel methylaluminoxane-activated cc-diimine NiBr2 complexes bearing bulky cyclic substituents at the o-position of an aryl group was studied. The activity of the synthesized complexes in polymerization was determined in the temperature range from 4 to 70degreesC and an ethylene pressure of 0.3 MPa. The structure and thermal characteristics of the as-prepared polyethylene samples were estimated by FTIR spectroscopy and DSC. It was shown that, as the temperature increases, the rate of the process passes through a maximum whose position depends on the structure of the complex and temperature. Polyethylene synthesized at 0.3 MPa is characterized by the presence of short-chain branchings containing from 3.5 to 63 CH3 groups/1000 C and, accordingly, a density varying from 940 to <910 kg/m(3). The molecular mass of the tested polymers varies from similar to 1 X 10(6) to similar to 1 X 10(3).

Cite: Ivanchev S. , Tolstikov G. , Badaev V. , Ivancheva N. , Oleinik I. , Khaikin S. , Oleinik I.
1,2-bis(arylimino)acenaphthyl nickel bromide complexes as catalysts of ethylene polymerization
Polymer Science - Series A. 2002. V.44. N9. P.931-935. WOS РИНЦ

Identifiers:

Web of science	WOS:000178686300003
Elibrary	13397493