| Abstract: | An approach of the special problems observed in copolymerization with Ziegler-Natta heterogeneous catalysts is given on the basis of linear low-density polyethylene synthesis in gas phase reaction. The reaction is controlled by chemistry and not by diffusion. The ethylene-l-butene copolymerization reactivity computed from the kinetic study varies with the copolymer composition, and this is due to the fact that the comonomer acts as a ligand of the active centers. The reactivities computed from NMR analysis are also not really reliable as the copolymer is a mixture of copolymers with different compositions. |
