Journal
REACTIVE & FUNCTIONAL POLYMERS
Volume 69, Issue 5, Pages 300-305Publisher
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2009.02.002
Keywords
Chitosan; Inulin; Carbodiimide mediated; Natural polymer; XPS spectra; pK(alpha) values
Funding
- Lithuanian State Science and Studies Foundation [N-04/2007]
- European Commission through a Marie Curie RTN SOCON [MRTN-CT-2004-512331]
- ORAFTI
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Novel chitosan-N-inulin graft copolymers with different degree of substitution (DS) of chitosan were synthesized via water-soluble 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide mediated reaction. Chemical structure and composition of the chitosan derivatives was confirmed by chemical analysis, FT-IR, XPS, H-1 and C-13 NMR spectroscopy, and potentiometry. Chitosan-inulin copolymers were high-molecular-weight hydrophilic products soluble in water in a wide pH range forming extraordinary viscous solutions. Intrinsic viscosity of N-modified chitosans was sharply suppressed by added electrolyte and had tendency to decrease at higher DS of chitosan. pK(alpha) values of the chitosan-inulin copolymers determined from potentiometric titration data using Henderson-Hasselbalch equation were in the range 6-7 slightly increasing at higher DS. Novel water-soluble chitosan copolymers retained cationic properties of chitosan and could be used as surface conditioners. (C) 2009 Elsevier Ltd. All rights reserved.
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