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Modified carrageenan. 1. H-CarragPAM, a novel biopolymer-based superabsorbent hydrogel

Hosseinzadeh, H ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.1177/0883911505055164
  3. Publisher: 2005
  4. Abstract:
  5. A novel kappa-carrageenan (κC)-based superabsorbing hydrogel was synthesized through graft copolymerization of acrylamide (AAm) onto a κC substrate in the presence of a crosslinking agent. The crosslinked κC-poly(AAm) polymer graft was partially hydrolyzed in alkaline medium to yield a superabsorbent resin, H-carragPAM. The resin structure was confirmed using FTIR spectroscopy. The variables of graft copolymerization (monomer, initiator, polysaccharide and crosslinker concentration, reaction temperature and time as well as stirrer speed) that affected on the ultimate water-swelling capacity were optimized. The time-temperature variation of the copolymerization was investigated in terms of the absence and presence of the atmospheric oxygen. Under optimized conditions, the maximum capacity of swelling in distilled water and saline (0.9 wt% NaCl) were 1,465 and 121 g/g, respectively. Since this hydrogel exhibited a very high absorptivity in saline, it may be referred to as low salt sensitive superabsorbent. © 2005 SAGE Publications
  6. Keywords:
  7. Absorption ; Biopolymers ; Copolymerization ; Fourier transform infrared spectroscopy ; Graft copolymers ; Hydrolysis ; Optimization ; Swelling ; Acrylamide ; Carrageenan ; Graft polymerization ; Superabsorbent ; Hydrogels ; Oxygen ; Atmosphere ; Cross linking ; Dissociation ; Hydrogel ; Infrared spectroscopy ; Polymerization ; Salinity ; Synthesis ; Temperature
  8. Source: Journal of Bioactive and Compatible Polymers ; Volume 20, Issue 5 , 2005 , Pages 475-490 ; 08839115 (ISSN)
  9. URL: https://journals.sagepub.com/doi/10.1177/0883911505055164