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Antipolyelectrolyte superabsorbing nanocomposites: synthesis and properties

Pourjavadi, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/app.30940
  3. Abstract:
  4. Novel polyampholytic superabsorbing nanocomposites based on the zwitterionic sulfobetaine monomer [3-(methacrylamido)propyl)]dimethyl(3- sulfopropyl)ammonium hydroxide were synthesized through in situ polymerization in aqueous solution with different contents of an organo-modified clay (OMMT, Cloisite 30B). Structural and thermomechanical properties of hydrogels were characterized by FT-IR, XRD, and DMTA, respectively. Swollen gel strength of hydrogels was determined by a rheological method. Storage modulus of the hydrogels was considerably improved in comparison with its the clay-free counterpart. The nanocomposite hydrogel containing 15% OMMT possessed the highest gel strength. The glass transition temperature was increased from 58.4 to 67.0°C for the clay-free and nanocomposite hydrogel containing 8% OMMT, respectively. The swelling behavior of the hydrogel in various salt solutions was investigated. Antipolyelectrolyte behavior was observed with enhancement of concentration of mono-and multivalent salts. Swelling in the various pH media was nearly pH-independent over a wide range of pH
  5. Keywords:
  6. Nanocomposite ; Sulfobetaine ; Superabsorbent ; Zwitterion ; Ammonium hydroxide ; Antipolyelectrolyte behavior ; Aqueous solutions ; Cloisite ; Concentration of ; Gel strengths ; Glass transition temperature ; In-situ polymerization ; Modified clays ; Multivalent salts ; Nanocomposite hydrogels ; Rheological method ; Salt solution ; Storage moduli ; Swelling behavior ; Thermomechanical properties ; Various pH ; XRD ; Zwitterionic sulfobetaine ; Ammonium compounds ; Clay minerals ; Gelation ; Gels ; Glass transition ; Synthesis (chemical) ; Electrolyte ; Hydrogel ; Organoclay ; pH ; Polymer blend ; Superabsorbent material ; Swelling
  7. Source: Journal of Applied Polymer Science ; Volume 114, Issue 6 , 2009 , Pages 3542-3547 ; 00218995 (ISSN)
  8. URL: http://onlinelibrary.wiley.com/doi/10.1002/app.30940/full