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Deacetylation of β-chitin. I. Influence of the deacetylation conditions
Journal of applied polymer science, 2004-09, Vol.93 (5), p.2416-2422
Chen, Cheng-Ho
Wang, Fang-Yu
Ou, Zu-Pei
2004
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Chen, Cheng-Ho
Wang, Fang-Yu
Ou, Zu-Pei
Titel
Deacetylation of β-chitin. I. Influence of the deacetylation conditions
Ist Teil von
Journal of applied polymer science, 2004-09, Vol.93 (5), p.2416-2422
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Erscheinungsjahr
2004
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
The influences of the deacetylation temperature, deacetylation time, and NaOH concentration on the degree of deacetylation (DD) of deacetylated products prepared from β‐chitin are discussed. The DD values of deacetylated products are related to the ratio of the signal intensities of methyl on acetyl groups and the first anomeric carbon, which are obtained from 13C‐NMR spectra. The results show that the DD values of deacetylated product increase as the NaOH concentration, deacetylation time, or deacetylation temperature increases. The thermal properties, chemical structures, and crystalline characteristic of deacetylated products are significantly related to their DD values. Differential scanning calorimetry shows that the peak temperature is slightly increased as the DD values of deacetylated products of β‐chitin increase. Thermogravimetric analysis shows that the thermal degradation onset temperature of deacetylated products decreases as the DD values increase. Fourier transform infrared spectra show that the intensity of a specific absorption peak of NH2 in deacetylated products significantly increases as DD increases. X‐ray diffraction patterns of deacetylated products with DD values of 17.5 and 44.7% have three significant diffraction peaks. However, there are only two diffraction peaks found in products with higher DD values of 76.5 and 94.7%. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2416–2422, 2004
Sprache
Englisch
Identifikatoren
ISSN: 0021-8995
eISSN: 1097-4628
DOI: 10.1002/app.20753
Titel-ID: cdi_crossref_primary_10_1002_app_20753
Format
–
Schlagworte
Applied sciences
,
chitin
,
chitosan
,
Degree of Deacetylation
,
Exact sciences and technology
,
NMR
,
Physicochemistry of polymers
,
Polymer industry, paints, wood
,
Technology of polymers
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