Alkyl Zinc Chlorides as New Initiators for the Polymerization and Copolymerization of Isobutene

Guerrero, A, Kulbaba, K and Bochmann, M (2008) Alkyl Zinc Chlorides as New Initiators for the Polymerization and Copolymerization of Isobutene. Macromolecular Chemistry and Physics, 209 (16). pp. 1714-1720. ISSN 1022-1352

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Abstract

Mixtures of RZnCl and tBuCl (R = Et) initiate the polymerization of isobutene in the temperature range of (- 35) - (+ 35) degrees C. The order of addition of the reagents is important for effective polymerization. Increasing the solubility of the zinc reagent (R = n-octyl) and use of cumyl chloride as co-initiator provides a system that is active from (-90) - (+35) degrees C. The molecular weights show a remarkably small temperature dependence, E-DP = -3.3 KJ.mol(-1), compared to E-DP = -23 kJ.mol(-1) in classical systems (AlCl3, EtAICl(2)). The molecular weights increase with decrease in zinc concentration and are consistently higher for n-octyl zinc chloride, as expected for a bulkier, less coordinating counteranion polymerizations are not retarded by isoprene addition; homopolymers and copolymers show essentially identical conversions and molecular weights.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
University of East Anglia > Faculty of Science > Research Groups > Synthetic Chemistry
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Depositing User: Vishal Gautam
Date Deposited: 02 Nov 2010 17:48
Last Modified: 25 Jul 2018 05:09
URI: https://ueaeprints.uea.ac.uk/id/eprint/10542
DOI: 10.1002/macp.200800150

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