Characterisation of δ-VCl3, a highly active ziegler-natta catalyst obtained by ball-milling. Dependence of polymerisation activity upon milling time

Sam, D. Siew Hew; Courtine, P.; Jannel, J.C.; Lalar, D.; Bujadoux, K.

doi:10.1016/0014-3057(86)90100-x

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Layer‐lattices in Ziegler–Natta catalysts

Zannetti¹,

Marega²,

Marigo³

et al. 1988

J Polym Sci B Polym Phys

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SynopsisSome layered inorganic compounds of interest in old and new polymerization process by Ziegler-Natta stereospecific catalysis have been studied. The results are reported of an investigation conceming the crystallographic disorder phenomena in a-TiCl,, VCl,, FeCl,, ball-milled a-MgCl,, 8-MgCl,, and in a new catalytic system produced according to some recent trends in the field. Best fits are reported of the experimental x-ray diffraction patterns with patterns calculated for a theoretical model that accounts for structural disorder; the different fits indicate that disorder phenomena due to stacking faults are rather frequent in the examined compounds. The catalytic systems are more and more dispersed, and the maximum of dispersion in heterogeneous systems is reached for the recently pro@ formulations.

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