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The kinetic characterization of the polymerization of isoprene in benzene initiated by butyl lithium as a first step in the synthesis of block copolymers

✍ Scribed by D.N. Cramond; P.S. Lawry; J.R. Urwin

Publisher
Elsevier Science
Year
1966
Tongue
English
Weight
393 KB
Volume
2
Category
Article
ISSN
0014-3057

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✦ Synopsis

The kinetics of the initiation and propagation steps in the polymerization of isoprene in benzene, initiated by butyl lithium as a first step in the synthesis of block copolymers has been examined. The rate of initiation is first order with respect to butyl lithium. A slow initial reaction is followed by an acceleration of the rate as polymer is generated. The sigmoidal rate curve appears to be characteristic of the initiation step and not due to termination products. The rate of propagation is shown to be a half order with respect to the concentration of growing chains, indicating a dimeric association of the polymer.

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