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Effect of reaction medium on radical copolymerization of acrylonitrile with vinyl acids

2000; Wiley; Volume: 79; Issue: 9 Linguagem: Inglês

10.1002/1097-4628(20010228)79

1097-4628

P. Bajaj, T. V. Sreekumar, Kushal Sen,

Synthesis and properties of polymers

Journal of Applied Polymer ScienceVolume 79, Issue 9 p. 1640-1652 Effect of reaction medium on radical copolymerization of acrylonitrile with vinyl acids Pushpa Bajaj, Corresponding Author Pushpa Bajaj [email protected] Department of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, IndiaDepartment of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India===Search for more papers by this authorT. V. Sreekumar, T. V. Sreekumar Department of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, IndiaSearch for more papers by this authorKushal Sen, Kushal Sen Department of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, IndiaSearch for more papers by this author Pushpa Bajaj, Corresponding Author Pushpa Bajaj [email protected] Department of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, IndiaDepartment of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India===Search for more papers by this authorT. V. Sreekumar, T. V. Sreekumar Department of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, IndiaSearch for more papers by this authorKushal Sen, Kushal Sen Department of Textile Technology, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, IndiaSearch for more papers by this author First published: 20 December 2000 https://doi.org/10.1002/1097-4628(20010228)79:9 3.0.CO;2-7Citations: 76Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Radical polymerization of acrylonitrile (AN) with methacrylic acid (MAA) and itaconic acid (IA) was carried out in a mixture of dimethylformamide (DMF) and water at 70°C using α, α′-azobisisobutyronitrile (AIBN) as an initiator. Monomer feed in the polymerization vessel was 98:2 (AN:MAA/IA) in the molar ratio, and the DMF:H2O ratio was varied between 20:80 and 80:20 (w/w). Copolymers were characterized by FTIR, carbon, hydrogen, nitrogen elemental CHN analysis, 1H- and 13C-NMR, and viscometry. The rate of polymerization (Rp) was found to decrease with an increase in DMF concentration in the reaction medium, that is, in 20% DMF for AN–MAA system, the Rp is 1.23% min−1 in 1 h of polymerization, while in 80% DMF, Rp is reduced to 0.37% min−1. The nature of the vinyl acid also affects the Rp. It has been shown that the rate of polymerization is higher for an AN–MAA system as compared to an AN–IA system (Rp = 1.0% min−1) and the methacrylic or itaconic acid content in the copolymer increases with an increase in the DMF concentration. The MAA content in the poly(AN–MAA) polymer produced in 20% DMF is 3.2 mol %, which increases to 6.1 mol % (calculated through FTIR spectra) when DMF is increased to 80% in the reaction medium. The intrinsic viscosity [η] of the poly(AN–IA) and poly(AN–MAA) copolymers in DMF was found to be in the range of 0.67–2.90 dLg−1 depending on the reaction medium. In determining the intrinsic viscosity, a definite deviation from rectilinearity of the concentration dependence in the high-dilution region is observed, thereby demonstrating the polyelectrolyte behavior of these polymers. Through FTIR and NMR spectral studies, PAN homopolymer and other copolymers have shown the formation of a small quantity of acrylamide units. In addition copolymer P10, which contains 10.1 mol % IA, has shown anhydride formation. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1640–1652, 2001 Citing Literature Volume79, Issue928 February 2001Pages 1640-1652 RelatedInformation