Journal
CHINESE JOURNAL OF POLYMER SCIENCE
Volume 37, Issue 10, Pages 1031-1038Publisher
SPRINGER
DOI: 10.1007/s10118-019-2335-8
Keywords
Ziegler-Natta catalysis; Ethylene polymerization; Heterogeneous catalysis; Lewis acids
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Ziegler-Natta precatalysts were synthetized from Lewis-base-modified-MgCl2 supports and treated by various Lewis acids, prior to activation by triethylaluminum, in order to increase their activity in ethylene polymerization. BCl3 provided the highest increase in activity. Interestingly, polymerization results showed no substantial modification of polymer properties, which is consistent with that Lewis acid only promotes the creation of new active sites, after activation by TEA, possessing very similar features to the original ones achievable with conventional precatalysts (i.e. without Lewis-acid treatment).
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