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New polysaccharide-g-polyacrylonitrile copolymers: synthesis and thermal characterization [electronic resource]

Zohurian Mehr, M. J. (Mohammad Jalal) ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/pat.362
  3. Abstract:
  4. Various natural and modified polysaccharides (i.e. arabic gum, tragacanth gum, xanthan gum, sodium alginate, chitosan, sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose) were modified using ceric-initiated graft polymerization of acrylonitrile under inert atmosphere. Grafting was confirmed using spectral (FT-IR) proofs. The grafting parameters were determined by conventional methods. Thermal characteristics of the homopolymer-free copolymers were studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) under nitrogen atmosphere. The major thermal transitions as well as the activation energy of the major decomposition stages were investigated. The polyacrylonitrile (PAN)-grafted polysaccharides were recognized to be thermally stable more than the corresponding non-grafted substrates, although they begin to decompose at relatively lower temperatures than the non-grafted counterparts
  5. Keywords:
  6. Polysaccharides ; Graft copolymers ; Polyacrylonitrile ; Differential scanning calorimetry ; Thermogravimetric analysis
  7. Source: Polymers for Advanced Technologies ; Volume 14, Issue 7, pages 508–516, July 2003
  8. URL: http://onlinelibrary.wiley.com/doi/10.1002/pat.362/abstract