Properties of chitosan-based biopolymer films with various degrees of deacetylation and molecular weights

Kwon T. Hwang, Jun T. Kim, Soon T. Jung, Gun S. Cho, Hyun J. Park

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

An increase in the depolymerization of chitosan was found with an increased concentration of sodium perborate. Acetic anhydride was added to reacetylated chitosan in a molar ratio per gulcosamine unit, and the amide I band of IR spectra changed with the addition of acetic anhydride. Sixteen chitosans with various molecular weights (MWs) and degrees of deacetylation (DODs) were prepared. X-ray diffraction patterns indicated their amorphous and partially crystalline states. Increases in the chitosan MW and DOD increased the tensile strength (TS). TS of the chitosan films ranged from 22 to 61 MPa. However, the elongation (E) of chitosan films did not show any difference with MW. TS of chitosan films decreased with the reacetylation process. However, E of chitosan films was not dependent on DOD. The water vapor permeabilities (WVPs) of the chitosan films without a plasticizer were between 0.155 and 0.214 ng m/m2 s Pa. As the chitosan MW increased, the chitosan film WVP increased, but the values were not significantly different. Moreover, the WVP values were not different from low DOD to high DOD.

Original languageEnglish
Pages (from-to)3476-3484
Number of pages9
JournalJournal of Applied Polymer Science
Volume89
Issue number13
DOIs
Publication statusPublished - 2003 Jul 15

Keywords

  • Depolymerization
  • Mechanical properties
  • Modification

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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