Synthesis of Cationic and Ampholytic Starch Graft Acrylamide and their Aqueous Salt Absorption |
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| Authors: | Hany El-Hamshary Fahad N. Assubaie |
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| Affiliation: | 1. Chemistry Department, Faculty of Science , Tanta University Tanta , Egypt;2. Petrochemical Research Chair, Department of Chemistry, College of Science , King Saud University , Riyadh, Saudi Arabia;3. King Faisal University, Faculty of Science, Department of Chemistry , Al-Ahsa, Saudi Arabia |
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| Abstract: | Acrylamide was grafted onto starch using ceric(IV) ion as initiator. Starch–graft-polyacrylamide was then modified through Mannich reaction using formaldehyde and diethylamine to give poly(N, N′-[(diethylamino) methyl]-acrylamide). The modified-graft copolymer was quaternized using different reagents; methyl iodide, n-butylbromide, sodium chloroacetate and propane sultone to give cationic and ampholytic graft materials. The absorbing properties of the produced materials toward deionized water and aqueous salt solutions were investigated. Studies of the absorbing properties of polyampholytes have revealed that these materials do not shrink upon increasing salt concentration. Kinetics of swelling in deionized water is also discussed. |
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| Keywords: | Polysaccharides graft copolymers polyelectrolytes polyampholytes swelling agricultural polymers |
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