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Synthesis and characterization of a novel (salep phosphate)-based hydrogel as a carrier matrix for fertilizer release

Pourjavadi, A ; Sharif University of Technology | 2012

2007 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.reactfunctpolym.2012.06.010
  3. Publisher: Elsevier , 2012
  4. Abstract:
  5. Salep phosphate modified biopolymers with different phosphate contents were prepared via reacting salep (a multi-component polysaccharide obtained from dried tubers of certain natural terrestrial orchids) with a solution of primary and secondary sodium phosphates under basic conditions in a semidry process. Structural characterization of salep phosphates were carried out by 31P NMR, FT-IR spectra and TGA curves. Determination of the phosphate content in samples was done by a standard spectrophotometric method. Then, novel (salep phosphate)-based hydrogels were synthesized by graft copolymerization of acrylic acid (AA) monomer onto salep phosphate backbones. Effect of the phosphate contents on swelling rate, equilibrium water absorbency in various pHs and potential of the hydrogels in release of KNO 3 fertilizer were investigated. The results indicated that phosphorylation of salep could greatly improve equilibrium water absorbency, swelling rate and fertilizer release behavior of related hydrogels
  6. Keywords:
  7. 31P NMR spectroscopy ; Hydrogel ; Salep phosphate ; Acrylic acids ; Basic conditions ; Carrier matrix ; Controlled release ; FT-IR spectrum ; Graft copolymerization ; Multicomponents ; Phosphate backbone ; Release behaviors ; Sodium phosphate ; Spectro-photometric method ; Structural characterization ; Swelling rates ; TGA curves ; Water absorbency ; Acrylic monomers ; Biopolymers ; Carboxylic acids ; Fertilizers ; Grafting (chemical) ; Nuclear magnetic resonance spectroscopy ; Phosphates ; Phosphorylation ; Sodium compounds ; Hydrogels
  8. Source: Reactive and Functional Polymers ; Volume 72, Issue 10 , 2012 , Pages 667-672 ; 13815148 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1381514812001721