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Reactivity of secondary metal-alkyls in catalytic propene polymerization: how dormant are "dormant chains"?

Research paper by Vincenzo V Busico, Roberta R Cipullo, Valeria V Romanelli, Sara S Ronca, Maria M Togrou

Indexed on: 11 Feb '05Published on: 11 Feb '05Published in: Journal of the American Chemical Society



Abstract

In this communication, we report on the direct measurement of dormant chain concentration and of the relative reactivity of authentic primary and secondary Zr-polymeryls toward propene, ethene, and H2 under practical conditions for a new highly regio- and stereoselective postmetallocene polymerization catalyst with controlled kinetic behavior. The results, in particular, confirm the poor reactivity toward propene of secondary M-polymeryls and the possible accumulation of dormant chains in propene homopolymerization.