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Full-polysaccharide superabsorbent hydrogels based on carboxymethylcellulose and sodium alginate

Hosseinzadeh, H ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. Publisher: 2006
  3. Abstract:
  4. A novel full-polysaccharide superabsorbent hydrogel was synthesized via chemical crosslinking of carboxymethylcellulose (CMC) and sodium alginate (Alg) using epichlorohydrine (ECH) as a crosslinker. A proposed mechanism for hydrogel formation was suggested and the structure of the product was established using FTIR spectroscopy. The influence of ECH concentration and Alg/CMC weight ratio as well as reaction time and temperature on water and saline (0.9 wt% NaCl) absorbency of the hydrogels were systematically investigated. Meanwhile, the overall activation energy for the crosslinking reaction between CMC and Alg polysaccharides was estimated to be 11.6 kj/mol. Under the optimised conditions concluded, maximum capacity of swelling in distilled water and saline solution were found to be 210 and 105 g/g respectively. Therefore, due to the high absorbency in saline solutions, the hydrogels may be referred to as anti-salt superabsorbents. In order to study of pH-sensitivity, swelling capacity of the synthesised hydrogels was measured in various solutions with different pHs ranged 1-10. © MD Publications Pvt Ltd
  5. Keywords:
  6. Swelling behaviour ; Superabsorbent ; Sodium alginate ; Hydrogel ; Crosslinking ; Carboxymethylcellulose
  7. Source: Journal of Polymer Materials ; Volume 23, Issue 1 , 2006 , Pages 61-69 ; 09738622 (ISSN)