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Highly deacetylated chitosan and its properties
Author(s) -
Mima Seiichi,
Miya Masaru,
Iwamoto Reikichi,
Yoshikawa Susumu
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070280607
Subject(s) - chitosan , ultimate tensile strength , acetylation , gel permeation chromatography , crystallization , permeation , degradation (telecommunications) , molecular mass , infrared spectroscopy , degree (music) , polymer chemistry , chemistry , molar mass distribution , alkali metal , materials science , nuclear chemistry , chemical engineering , organic chemistry , composite material , polymer , physics , biochemistry , membrane , telecommunications , computer science , acoustics , engineering , gene , enzyme
A preparative method has been established for obtaining chitosan products which have a desired degree of deacetylation of up to virtually 100%. Effective deacetylation was attained by intermitently washing the intermediate product in water two or more times during the alkali treatment. The weight average molecular weight ( M̄ w ) of the product, which was measured by gel permeation liquid chromatography, was about 5 × 10 5 at the highest deacetylation of nearly 100%, and the degradation of the molecular chain was not so significant. Tensile strength of the wet film increased markedly with increasing degree of deacetylation, while the dry film did not show a corresponding significant increase of the tensile strength. In the infrared spectra of chitosan film new sharp bands appeared especially at the high degree of deacetylation. This was attributed to increased “crystallization” brought about by high deacetylation.