Study of Ziegler-Natta catalysts. Part II. The liquid phase and polymerization activity of the catalyst

The polymerization activity of the Ziegler-Natta catalysts is significantly affected by the aluminium alkyls in the liquid phase. These may be studied provided the solid phase of the catalyst remains unchanged. Part of these aluminum alkyls is adsorbed on the surface of the solid phase. It is possible to displace one type of alkyls by another one or to elute it from the adsorbed layer. This last affects the polymerization rate.