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Citation: Wang Fengjiang, Zhan Ruiyun, Liu Guozhi, Qian Baogong. STUDIES ON THE POLYMERIZATION OF BUTADIENE IN THE PRESENCE OF IRON CATALYST Ⅴ.ESR,NMR AND IR APPROACH TO THE MECHANISM OF POLYMERIZATION[J]. Chinese Journal of Applied Chemistry, ;1987, 4(4): 1-5. shu

STUDIES ON THE POLYMERIZATION OF BUTADIENE IN THE PRESENCE OF IRON CATALYST Ⅴ.ESR,NMR AND IR APPROACH TO THE MECHANISM OF POLYMERIZATION

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Corresponding author: Wang Fengjiang,
Received Date: 20 August 1986

Fund Project:

ESR,¹H-NMR and IR were combined so as to give information concerning the mechanism of butadiene polymerization in the presence of catalyst system Fe(phen)Cl₃-(i-C₄H₉)₃Al. It was shown by the ESR spectra that the iron in active species is reduced into Fe(Ⅱ) by triisobatyl aluminium during the polymerization and the signal of free radical could be observed,so a reduction mechanism is proposed. Two systems, Fe(phen)Cl₃-(i-C₄H₉)₃Al and Fe(phen)Cl₃-(i-C₄H₉)₃Al-butadiene, have diffferent spectra in ESR. The former gives a very wide signal(△H_pp=900G), but the latter shows a more sharp one (△H_pp=50G). The overall polymerization mechanism has been proposed, which is supported by¹H-NMR and IR spectra measurements of the system.
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