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Kinetics and mechanism of the K 2 CrO 4 NaAsO 2 redox‐initiated aqueous polymerization of acrylonitrile
Author(s) -
Maity Arjun,
Biswas Mukul
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.21289
Subject(s) - polyacrylonitrile , thermogravimetric analysis , acrylonitrile , polymerization , polymer chemistry , materials science , redox , kinetics , chemistry , polymer , inorganic chemistry , copolymer , organic chemistry , physics , quantum mechanics
The kinetics and mechanism of acrylonitrile polymerization initiated by a redox pair [potassium chromate (K 2 CrO 4 ) and sodium arsenite (NaAsO 2 )] were studied. The overall rate of polymerization was proportional to √[K 2 CrO 4 ] × [NaAsO 2 ], and the energy of activation was approximately 10.5 kJ/mol. Polyacrylonitrile was recovered as a coagulum in the medium. The formation of polyacrylonitrile was confirmed with Fourier transform infrared and 1 H‐NMR analyses. Scanning electron microscopy analysis of the polymer revealed the formation of aggregates of polymer particles (3–67 nm). Thermogravimetric studies indicated 50% weight loss at 400°C, and dynamic thermal analysis scan studies revealed an exothermic peak at 507°C due to massive oxidative thermal degradation of the polyacrylonitrile backbone. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 276–280, 2005