Abstract
Abstract Ethylene homopolymerizations have been performed at different temperatures in the range of 368- 378K over industrial Cr catalyst. Kinetic parameters such as rate constant of elementary reaction of polymerization or concentration of active centers ([C*]) were calculated by kinetic approach. Two types of transfer reactions of polymer chains, i.e. chain transfer with monomer and spontaneous chain transfer, occur over Cr catalyst. Chain transfer with monomer proceeded dominantly compared to spontaneous chain transfer. However, at elevated temperature the proportion of spontaneous chain transfer increased because of higher activation energy of this reaction. From the values of activation energy of transfer and propagation reaction, it is strongly suggested that the rate determining step of propagation reaction and chain transfer with monomer is ethylene coordination.
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