Characterization and thermal stability of cellulose‐graft‐polyacryloniytrile prepared by using KMnO4/citric acid redox system |
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| Authors: | A S El‐Khouly Y Takahashi A Takada A A Safaan E Kenawy Y A Hafiz |
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| Affiliation: | 1. Division of Advanced Device Materials, Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga 816‐8580, Japan;2. Department of Chemistry, Faculty of Science, Tanta University, El‐Gharbia, Tanta, Egypt;3. Department of Chemistry, Petrochemicals Research Chair, Faculty of Science, King Saud University, Riyadh 11451, Saudi Arabia |
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| Abstract: | An effective condition of graft polymerization of acrylonitrile onto cellulose fiber in large volume of KMnO4/citric acid aqueous solution was examined and the produced grafted copolymers were characterized by using SEM, NMR, FTIR, XRD, TGA, and DSC in comparison with component homopolymers. Graft yield, GY, obtained by simple weighting method was close to the value obtained by NMR analysis. Significant change of chemical structure in cellulose fiber, other than graft reaction, was not detected by NMR and FTIR measurements, whereas a decrease in the degree of crystallinity by the reaction was detected by XRD measurement. It was pointed out that thermograms for grafted samples resembles with that of cellulose at T < 370°C and become similar with that for polyacrylonitrile at T > 370°C and the mass of residue at 550°C is proportional to the content of polyacrylonitrile (GY) only. It is concluded that thermal decomposition of both polymers occurs almost independently in grafted polymers and thermal stability of cellulose fiber is not improved. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 |
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| Keywords: | cellulose graft polymerization polyacrylonitrile redox initiation thermal stability |
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