S. S. Perin, J. Severn, C. Koning
Jan 3, 2006
Citations
0
Influential Citations
19
Citations
Journal
Macromolecular Chemistry and Physics
Abstract
The use of triisobutylaluminium and diethyl zinc as cocatalyst and chain transfer agent respectively in ethylene/1-hexene copolymerisation, carried out with a Ziegler-Natta catalyst of type MgCl 2 /TiCl 4 /diisobutyl phthalate, has been found to give significantly higher comonomer incorporation than was obtained when triethylaluminium was used in combination with diethyl zinc. Triisobutylaluminium reacts readily with diethyl zinc, yielding metallic zinc, most likely via the formation of intermediate hydride species. In contrast, the use of 2,6-dimethylpyridine as external donor in this system has been found to have relatively little effect on comonomer incorporation and distribution, indicating that a change from tendentially isospecific to syndiospecific propagation in propene polymerisation is not accompanied by a major improvement in comonomer distribution in ethylene/ 1-hexene copolymerisation.