The Ziegler-Natta catalyst used for polymeris | vedclass

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(B) The Ziegler-Natta catalyst is a mixture of titanium tetrachloride $(TiCl_4)$ and an organoaluminium compound like triethylaluminium $((C_2H_5)_3Al

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$TiCl_3$

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(B) The Ziegler-Natta catalyst is a mixture of titanium tetrachloride $(TiCl_4)$ and an organoaluminium compound like triethylaluminium $((C_2H_5)_3Al)$.In the reaction mechanism,$TiCl_4$ is reduced by the organoaluminium compound to form an active species containing $Ti(III)$,which is $TiCl_3$ (or an alkylated derivative thereof).This $TiCl_3$ species acts as the active site where the monomer coordinates and undergoes insertion into the metal-carbon bond to propagate the polymer chain.

The Ziegler-Natta catalyst used for polymerisation of ethene and styrene is $TiCl_4 + (C_2H_5)_3Al$. The catalysing species (active species) involved in the polymerisation is

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