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Investigation of the initiation reaction of isoprene polymerization with 2-ethylhexylsodium in heptane

✍ Scribed by Natalia I. Pakuro; Alexander A. Arest-Yakubovich; Larisa V. Shcheglova

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
335 KB
Volume
198
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The kinetics of the initiation of isoprene polymerization in heptane with the hydrocarbon‐soluble alkylsodium compound 2‐ethylhexylsodium was studied. Initiation rates were estimated from the induction period and by measuring UV spectra of polyisoprenyl‐sodium (λ~max~ = 304 nm) during the course of polymerization. The initiation reaction is first order in initiator both in the course of the reaction and with respect to the starting concentration of the initiator. The same result is obtained when 2‐ethylhexyllithium is used. The initiation rate constants are: k~i~ = 1,6 · 10^−3^ and 5,5 · 10^−4^ L/(mol · s) for sodium and lithium compounds at 26°C, respectively. Aggregated forms of organoalkali compounds are suggested to take part in the initiation reaction of isoprene polymerization.

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