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Title: Rheological and structural studies of carboxymethyl derivatives of chitosan

The degrees of substitution of chitosan derivatives were varied and the viscoelastic behavior of these biopolymer solutions was studied using rheology. Chitosan is a cationic copolymer of glucosamine and N-acetylglucosamine obtained by alkaline deacetylation of chitin. Due to its inherent non-toxicity, biocompatibility, and biodegradability, chitosan has gained much interest. However, the poor solubility of the biopolymer in water and most common organic solvents limits its applications. Therefore, the focus of this work is the chemical modification of chitosan via carboxymethylation as well as studying the viscoelastic behavior of these polymer solutions. Varying degrees of substitution (DS) of carboxymethyl chitosan derivatives were synthesized by treating chitosan with monochloroacetic acid under alkylated medium varying the reaction time and temperature. The effect of degree of substitution on the rheology of these polymer solutions was studied as a function of concentration. The viscosity of chitosan derivatives sharply increased with increase in degree of substitution. G' and G' dependence on strain and angular frequency were studied and were found to exhibit predominantly viscous behavior. Additional characterization of the derivatized products were further studied using Fourier transform infrared (FT-IR), {sup 1}H Nuclear Magnetic Resonance ({sup 1}H NMR) spectroscopy, X-ray diffraction (XRD), and thermal gravimetric analysis asmore » well as differential scanning calorimetry (DSC). Degree of substitution (DS) was calculated by titrimetric method.« less
Authors:
;  [1]
  1. Delaware State University, Department of Chemistry, 1200 N. Dupont Highway, Dover, DE 19901 (United States)
Publication Date:
OSTI Identifier:
22280345
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1599; Journal Issue: 1; Conference: 7. international conference on times of polymers (TOP) and composites, Ischia (Italy), 22-26 Jun 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; AMINO ACIDS; CALORIMETRY; CHITIN; CONCENTRATION RATIO; COPOLYMERS; DERIVATIZATION; FOURIER TRANSFORMATION; GLUCOSAMINE; HYDROGEN 1; INFRARED SPECTRA; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; OLIGOSACCHARIDES; ORGANIC SOLVENTS; RHEOLOGY; STRAINS; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION