caa a22 4500 378903098 CHVBK 20180305123522.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/epoly.2004.4.1.587 doi (NATIONALLICENCE)gruyter-10.1515/epoly.2004.4.1.587 Modified chitosan, 7 Graft copolymerization of methacrylonitrile onto chitosan using ammonium persulfate initiator [Elektronische Daten] [Ali Pourjavadi, Shahram Barzegar, Gholam Reza Mahdavinia] Graft copolymerization of methacrylonitrile (MAN) onto chitosan using ammonium persulfate (APS) as an initiator was studied. The reactions were carried out under argon atmosphere in a homogenous aqueous phase containing a small portion of acetic acid (AcOH). Evidence of graft copolymerization was obtained by FTIR spectroscopy, e.g., the appearance of nitrile in the spectrum of chitosan-graftpolymethacrylonitrile. The synthetic conditions were systematically optimized through studying the influential factors including temperature, as well as concentrations of initiator, MAN, AcOH, sodium dodecyl sulfate surfactant (SDS) and chitosan. The effects of individual factors were investigated by calculating and monitoring the variation of the grafting parameters, i.e., grafting ratio, grafting efficiency, add-on value, homopolymer content, and total conversion. The optimum condition was achieved at APS 0.0108 mol/L, MAN 0.201 mol/L, 80°C, SDS 0.0016 mol/L, chitosan 0.5 g, AcOH 0.0086 mol/L. The overall activation energy for the graft copolymerization was determined to be 7.3 kJ/mol. © 2013 by Walter de Gruyter GmbH & Co. Pourjavadi Ali Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Aside Ave., P.O. Box 11365-9516, Tehran, Iran aut Barzegar Shahram Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Aside Ave., P.O. Box 11365-9516, Tehran, Iran aut Mahdavinia Gholam Reza Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Aside Ave., P.O. Box 11365-9516, Tehran, Iran aut e-Polymers De Gruyter 4/1(2004-12-01), 587-598 2197-4586 4:1<587 2004 4 epoly https://doi.org/10.1515/epoly.2004.4.1.587 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/epoly.2004.4.1.587 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pourjavadi Ali Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Aside Ave., P.O. Box 11365-9516, Tehran, Iran aut NATIONALLICENCE 700 1- Barzegar Shahram Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Aside Ave., P.O. Box 11365-9516, Tehran, Iran aut NATIONALLICENCE 700 1- Mahdavinia Gholam Reza Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Aside Ave., P.O. Box 11365-9516, Tehran, Iran aut NATIONALLICENCE 773 0- e-Polymers De Gruyter 4/1(2004-12-01), 587-598 2197-4586 4:1<587 2004 4 epoly CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter