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Oxygen promoted radical polymerization of acrylonitrile in aqueous nitric acid. A kinetic study

Authors
Journal
European Polymer Journal
0014-3057
Publisher
Elsevier
Publication Date
Volume
17
Issue
12
Identifiers
DOI: 10.1016/0014-3057(81)90088-4
Disciplines
  • Earth Science

Abstract

Abstract The polymerization of acrylonitrile (AN) initiated by oxygen-ascorbic acid (AA)-ferric ion system was studied in dil. HNO 3 at 40°. The rate of polymerization, R p , was found gravimetrically. In the [Fe 3+] range, (2–5 × 10 −5 M, R p was proportional to [AN] 1.5 ± 0.05, [O 2] 0.5 ± 0.02 [AA] 0 and [Fe 3+] 0; for [Fe 3+] = (5–30) × 10 −5 M, it was proportional to [AN] 1.8 ± 0.05, [O 2] 0.6 ± 0.02, [AA] 0 and [Fe 3+] −0.9 ± 0.05. A plausible reaction scheme is proposed and rate law presented to explain these results. R p increased with ionic strength and [HNO 3] (up to ∼0.25 M). An initial rate increase with temperature followed by a decrease was noticed. Chain lengths of the polymers were determined viscometrically.

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