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Studies on graft copolymerization of chitosan with synthetic monomers.

Harish Prashanth, K. V. and Tharanathan, R. N. (2003) Studies on graft copolymerization of chitosan with synthetic monomers. Carbohydrate Polymers, 54 (3). pp. 343-351.

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Abstract

Graft copolymerization of acrylonitrile and methylmethacrylate onto chitosan using potassium persulfate as an initiator was studied. Evidence for graft-copolymerization was obtained by infrared spectroscopy and CP-MAS 13C-NMR data. The appearance of nitrile (–CxN) at 2244 cm21 for chitosan-graft-polyacrylonitrile (C-g-PAN) and carbonyl (–CyO) at 1730 cm21 for chitosan-graft-polymethylmethacrylate (C-g-PMMA) confirmed graft-copolymerization. CP-MAS 13C-NMR showed the appearance of a signal at 33 ppm assigned to the N– CH group. With varying monomer concentration (40–180 mM), the percentage degree of substitution varied from 2 to 50. Maximum grafting efficiency was obtained with 120 mM acrylonitrile and 0.74 mM potassium persulfate at 65 8C for 2 h under nitrogen atmosphere for 1% chitosan solution and for C-g-PMMA 140 mM methylmethacrylate at 75 8C gave maximum substitution. X-ray diffraction showed changes in crystallinity pattern. Slightly different mechanisms in side chain substitution for these two copolymers were envisaged. DSC thermogram showed a decomposition peak for C-g-PAN at around 255 8C and a melting peak for C-g-PMMA at around 400 8C. C-g-PMMA could be thermopressed into films. Residual monomers were not found by HPLC in graft copolymers stored even for longer periods.

Item Type: Article
Uncontrolled Keywords: Chitosan; Polyacrylonitrile; Polymethymethacrylate; Copolymer; Grafting
Subjects: 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 27 Polymer Chemistry
600 Technology > 08 Food technology > 28 Meat, Fish & Poultry
Divisions: Dept. of Biochemistry
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 21 Nov 2008 05:45
Last Modified: 21 Nov 2008 05:45
URI: http://ir.cftri.com/id/eprint/5624

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