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Temperature sensitive superabsorbent hydrogels from poly(N-t-butyl acrylamide-co-acrylamide) grafted on sodium alginate

Pourjavadi, A ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1002/masy.200851424
  3. Publisher: 2008
  4. Abstract:
  5. Temperature-sensitive hydrogels based on N-t-butylacrylamide (TBA), acrylamide (AAm), and sodium alginate were prepared by free radical polymerization method. Methylenebisacrylamide (MBA) and amonium persulfate (APS) were applied as water soluble crosslinker and initiator, respectively. The chemical structure of the hydrogels was confirmed by FT-IR spectroscopy and thermogravimetric analysis (TCA) methods. Morphology of the samples was examined by scanning electron microscopy (SEM). By changing the initial TBA/AAm mole ratios, hydrogels with different swelling properties were obtained. The rate parameters were found to be 2.0, 2.4, and 3.5 min for the superabsorbents with AAm/TBA weight ratio of 1.0, 1.3 and 2.0 respectively. The swelling behavior in distilled water and different pH solutions was investigated. A preliminary swelling kinetics and the absorbency under load (AUL) were also studied. At the applied pressure (2.07 kPa), maximum swelling was found to be 17, 19, and 21 (g/g) for the superabsorbent hydrogels with AAm/TBA weight ratios of 1.0, 1.5 and 2.0, respectively. Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA
  6. Keywords:
  7. Acrylic monomers ; Amides ; Atom transfer radical polymerization ; Chemical reactions ; Colloids ; Gravimetric analysis ; Hydrogels ; Monomers ; Photoresists ; Polymerization ; Polymers ; Scanning electron microscopy ; Sodium ; Thermogravimetric analysis ; Acrylamide ; Applied pressures ; Chemical structures ; Cross linkers ; Crossllnking ; Distilled waters ; IR spectroscopies ; Methylenebisacrylamide ; Mole ratios ; pH solutions ; Radical polymerization ; Rate parameters ; Sodium alginates ; Superabsorbent hydrogels ; Swelling behaviors ; Swelling kinetics ; Swelling properties ; Temperature sensitives ; Under loads ; Weight ratios ; Free radical polymerization
  8. Source: Macromolecular Symposia ; Volume 274, Issue 1 , December , 2008 , Pages 177-183 ; 10221360 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/masy.200851424