Chain transfer reaction to diethylzinc in ethylene polymerization by metallocene catalysts

Chain transfer reaction to diethylzinc in ethylene polymerization by metallocene catalysts The addition of diethyl zinc into the metallocene catalytic system for ethylene polymerization efficiently reduces the molecular weight of the resulted polyethylene due to the transfer reaction of the propagation chain to the dialkyl zinc. The alkyl exchanging reaction between diethyl zinc and the methylaluminoxane or trimethyl aluminum may result in the new zinc compounds. Therefore, the result of regression analysis shows that the chain transfer is not an ideal first order reaction. The regression result also shows that the transfer reaction to zinc is much stronger than other transfer reaction. The reaction results in the long alkyl zinc, and the latter is easily be oxidized, and then forms the polyethylene contains an abundance of hydroxyl capped chain end, which has been identified by means of 13C-NMR. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Polymer Research Springer Journals

Chain transfer reaction to diethylzinc in ethylene polymerization by metallocene catalysts

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media B.V., part of Springer Nature
Subject
Chemistry; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials
ISSN
1022-9760
eISSN
1572-8935
D.O.I.
10.1007/s10965-018-1541-3
Publisher site
See Article on Publisher Site

Abstract

The addition of diethyl zinc into the metallocene catalytic system for ethylene polymerization efficiently reduces the molecular weight of the resulted polyethylene due to the transfer reaction of the propagation chain to the dialkyl zinc. The alkyl exchanging reaction between diethyl zinc and the methylaluminoxane or trimethyl aluminum may result in the new zinc compounds. Therefore, the result of regression analysis shows that the chain transfer is not an ideal first order reaction. The regression result also shows that the transfer reaction to zinc is much stronger than other transfer reaction. The reaction results in the long alkyl zinc, and the latter is easily be oxidized, and then forms the polyethylene contains an abundance of hydroxyl capped chain end, which has been identified by means of 13C-NMR.

Journal

Journal of Polymer ResearchSpringer Journals

Published: Jun 2, 2018

References

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