Journal
CARBOHYDRATE POLYMERS
Volume 80, Issue 1, Pages 291-295Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2009.11.030
Keywords
Chitosan; Chitin; Nanofibers; Degree of deacetylation; Thermal decomposition
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Funding
- Ministry of Education, Science, and Technology (MEST) of Korea [850-20080090]
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Chitin and chitosan nanofibers with different degrees of deacetylation (DD) were fabricated by electrospinning using 1,1,1,3,3,3-hexafluoro-2-propanol (HELP) as the spinning solvent and by subsequent deacetylation using a 40% aqueous NaOH Solution at 100 degrees C for 0-150 min. The thermal decomposition behavior of the chitin and chitosan nanofibers was examined by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The thermal stability of the chitin/chitosan nanofibers was decreased with increasing the DD and the peak temperature for thermal decomposition on the TGA Curves was shifted to a lower temperature. The activation energies for the thermal degradation of the chitin/chitosan nanofibers were calculated from the TGA curves. The two exotherms corresponding to the decomposition of N-acetyl-D-glucosamime and D-glucosamine units in the chitin/chitosan molecular chains were observed on the DSC thermograms. This Suggests that the residual N-acetyl groups had a blocky distribution in the molecular chain, possibly due to heterogeneous deacetylation. (C) 2009 Elsevier Ltd. All rights reserved.
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