caa a22 4500 378903519 CHVBK 20180305123524.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/epoly.2004.4.1.275 doi (NATIONALLICENCE)gruyter-10.1515/epoly.2004.4.1.275 Preparation and swelling behaviour of a novel anti-salt superabsorbent hydrogel based on kappa-carrageenan and sodium alginate grafted with polyacrylamide [Elektronische Daten] [Ali Pourjavadi, Hossein Ghasemzadeh, Hossein Hosseinzadeh] A novel superabsorbent hydrogel was synthesized via crosslinking graft copolymerization of acrylamide (AAm) onto kappa-carrageenan (κC) and sodium alginate (Na-Alg) backbones in a homogeneous solution. Methylenebisacrylamide (MBA) and potassium persulfate (KPS) were applied as water-soluble crosslinker and initiator, respectively. FTIR spectroscopy was used for confirming the structure of the final product. A mechanism for superabsorbent hydrogel formation was also suggested. The parameters affecting the swelling capacity of the synthesized hydrogel, i.e., κC-Alg weight ratio, concentration of AAm, MBA and KPS, as well as reaction temperature were systematically optimized for obtaining maximum absorbency. The swelling capacity of hydrogels was also measured in various salt solutions (LiCl, NaCl, KCl, MgCl2, CaCl2, SrCl2, BaCl2, and AlCl3). Due to their high swelling ability in salt solutions, the hydrogels may be referred to as ‘anti-salt superabsorbent' polymers. The overall activation energy for the graft copolymerization reaction was found to be 374 kJ/mol. The swelling kinetics of the hydrogels in distilled water and in saline solution (0.9 wt.-% NaCl) was investigated. © 2013 by Walter de Gruyter GmbH & Co. Pourjavadi Ali Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Azadi Ave., P. O. Box 11365-9516, Tehran, Iran aut Ghasemzadeh Hossein Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Azadi Ave., P. O. Box 11365-9516, Tehran, Iran aut Hosseinzadeh Hossein Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Azadi Ave., P. O. Box 11365-9516, Tehran, Iran aut e-Polymers De Gruyter 4/1(2004-12-01), 275-287 2197-4586 4:1<275 2004 4 epoly https://doi.org/10.1515/epoly.2004.4.1.275 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/epoly.2004.4.1.275 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pourjavadi Ali Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Azadi Ave., P. O. Box 11365-9516, Tehran, Iran aut NATIONALLICENCE 700 1- Ghasemzadeh Hossein Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Azadi Ave., P. O. Box 11365-9516, Tehran, Iran aut NATIONALLICENCE 700 1- Hosseinzadeh Hossein Polymer Research Laboratory, Department of Chemistry, Sharif University of Technology, Azadi Ave., P. O. Box 11365-9516, Tehran, Iran aut NATIONALLICENCE 773 0- e-Polymers De Gruyter 4/1(2004-12-01), 275-287 2197-4586 4:1<275 2004 4 epoly CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter