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

✍ Scribed by G.G. Reddy; T. Nagabhushanam; K.V. Rao; M. Santappa

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 328 KB
• Volume: 17
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(81)90088-4

✦ Synopsis

The polymerization of acrylonitrile (AN) initiated by oxygen ascorbic acid (AAt ferric ion system was studied in dil. HNO3 at 40 °. The rate of polymerization, R v, was found gravimetricallv. In the [Fe a+] range, (2-5 x 10-SM, Rp was proportional to [AN] t'5:°'°5, [02] °'5=°'°2 [AA]°~and [Fe3+]°; for [Fe 3+] = (5-30) x 10 s M, it was proportional to [AN] l's+°'°s, [02] o.6+o.o2 , [AA] ° and [Fe3+] -°9+°'°s. A plausible reaction scheme is proposed and rate law presented to explain these results. Rp increased with ionic strength and [HNO3] (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.