Kinetics and mechanism of the K 2 CrO 4 NaAsO 2  redox‐initiated aqueous polymerization of acrylonitrile | Zendy

Maity Arjun | Zendy; Biswas Mukul | Zendy

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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

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