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New smart carrageenan-based superabsorbent hydrogel hybrid: Investigation of swelling rate and environmental responsiveness

Salimi, H ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1002/app.32210
  3. Publisher: 2010
  4. Abstract:
  5. Synthesis of novel natural-based superabsorbents with improved properties is of prime importance in many applications. In this article we report an efficient synthesis of new polysaccharide-based superabsorbent hybrid composing carrageenan, acrylic acid, sodium acrylate, and 2-hydroxyethyl acrylate through homogenous solution polymerization process. Infrared spectroscopy and thermogravimetric analysis (TGA) were carried out to confirm the chemical structure of the hydrogel. Moreover, morphology of the samples was examined by scanning electron microscopy (SEM). To deeper studies on the structure-property relation in SAP hydrogels, three hydrogels with different acrylic acid/2-hydroxyethyl acrylate (AA/HEA) weight ratios were synthesized and swelling capacity in various media was assessed. The hydrogel hybrid was also tested to be swollen and deswollen alternatively in 0.01 and 0.1 M sodium chloride solution. Moreover, the swelling-deswelling capability of the hydrogel in alternatively changed methanol-water mixtures was studied. Additionally, the swelling kinetics of the synthesized hydrogels were examined. The absorbency under load (AUL) of hydrogel was also investigated by using an AUL tester at various applied pressures
  6. Keywords:
  7. Carrageenan ; Acrylic acids ; Applied pressure ; Chemical structure ; Efficient synthesis ; Environmental responsiveness ; Hydroxyethyl acrylate ; Methanol-water mixtures ; SEM ; Sodium acrylates ; Sodium chloride solution ; Solution polymerization ; Structure property relation ; Super absorbent ; Superabsorbent hydrogel ; Superabsorbents ; Swelling behavior ; Swelling capacities ; Swelling kinetics ; Swelling rates ; Swelling-deswelling ; Weight ratios ; Acrylics ; Anodic oxidation ; Carboxylic acids ; Copolymerization ; Grafting (chemical) ; Infrared spectroscopy ; Methanol ; Organic acids ; Organic polymers ; Scanning electron microscopy ; Sodium ; Sodium chloride ; Thermogravimetric analysis ; Hydrogels ; Graft copolymer ; Polymerization ; Polysaccharide ; Pressure ; Spectroscopy ; Superabsorbent material ; Swelling ; Synthesis
  8. Source: Journal of Applied Polymer Science ; Volume 117, Issue 6 , September , 2010 , Pages 3228-3238 ; 00218995 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/app.32210/abstract;jsessionid=DD10924A9C477E555549ACBA40984EDA.f02t03