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New polysaccharide‐g‐polyacrylonitrile copolymers: synthesis and thermal characterization
Author(s) -
ZohuriaanMehr M. J.,
Pourjavadi A.
Publication year - 2003
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.362
Subject(s) - thermogravimetric analysis , polyacrylonitrile , materials science , differential scanning calorimetry , grafting , polymer chemistry , thermal decomposition , cellulose , potassium persulfate , copolymer , carboxymethyl cellulose , acrylonitrile , chemical engineering , polymerization , polymer , organic chemistry , chemistry , sodium , composite material , physics , engineering , metallurgy , thermodynamics
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. Copyright © 2003 John Wiley & Sons, Ltd.