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

✍ Scribed by Antonio Guerrero; Kevin Kulbaba; Manfred Bochmann

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 210 KB
Volume: 209
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.200800150

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✦ Synopsis

Abstract

Mixtures of RZnCl and __t__BuCl (R = Et) initiate the polymerization of isobutene in the temperature range of (−35)—(+35) °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) °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 (AlCl~3~, EtAlCl~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. The polymerizations are not retarded by isoprene addition; homopolymers and copolymers show essentially identical conversions and molecular weights.

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