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Metal chelates in vinyl polymerization: Bulk polymerization of acrylonitrile initiated by Cu(II)–imine complexes

✍ Scribed by Marjit, D. N. ;Kalpagam, V. ;Nandi, U. S.

Publisher
John Wiley and Sons
Year
1982
Weight
324 KB
Volume
20
Category
Article
ISSN
0360-6376

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✦ Synopsis

Abstract

This article deals with the kinetics and mechanism of acrylonitrile (AN) polymerization initiated by Cu(II)–4‐anilino 3‐pentene 2‐one[Cu(II)ANIPO], Cu(II)–4‐p‐toluedeno 3‐pentene 2‐one [Cu(II)TPO], and Cu(II)–4‐p‐nitroanilino 3‐pentene 2‐one [Cu(II)NAPO] in bulk at 60°C. The polymerization is free radical in nature. The exponent of initiator(I) is ≃ 0.5. The initiation step is a complex formation between the chelate and monomer and subsequent decomposition of the intermediate complex giving rise to free radical and Cu(I). This is substantiated by ultraviolet (UV) and electron spin resonance (ESR) studies. The activation energies and kinetic and chain transfer constants have also been evaluated.

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