Effect of the degree of deacetylation on the thermal decomposition of chitin and chitosan nanofibers

Nam, Young Sik; Park, Won Ho; Ihm, Dae-Woo; Hudson, Samuel M.

doi:10.1016/j.carbpol.2009.11.030

Cited by 137 publications

(64 citation statements)

References 28 publications

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“…This relation can be seen for samples of CHT/5 C I and CHT/5 CII, but in our case it is no longer noticeable for composites with nanometric filler. The second stage (170-400°C) of thermal decomposition is assigned to the degradation of chitosan, caused by the rupture of the glycosidic linkages between the glucosamine and N-acetylglucosamine rings [49,50]. The comparison of data presented in Table 2 clearly shows that addition of filler to chitosan matrix caused lowering of thermal stability of samples.…”

Section: Thermal Stability Of Compositesmentioning

confidence: 96%

Thermal and mechanical properties of chitosan nanocomposites with cellulose modified in ionic liquids

Grząbka-Zasadzińska

Amietszajew

Borysiak

2017

J Therm Anal Calorim

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In this paper, ionic liquid treatment was applied to produce nanometric cellulose particles of two polymorphic forms. A complex characterization of nanofillers including wide-angle X-ray scattering, Fourier transform infrared spectroscopy, and particle size determination was performed. The evaluated ionic liquid treatment was effective in terms of nanocrystalline cellulose production, leaving chemical and supermolecular structure of the materials intact. However, nanocrystalline cellulose II was found to be more prone to ionic liquid hydrolysis leading to formation larger amount of small particles. Each nanocrystalline cellulose was subsequently mixed with a solution of chitosan, so that composite films containing 1, 3, and 5% mass/mass of nanometric filler were obtained. Reference samples of chitosan and chitosan with micrometric celluloses were also solvent casted. Thermal, mechanical, and morphological properties of films were tested and correlated with properties of filler used. The results of both, tensile tests and thermogravimetric analysis showed a significant discrepancy between composites filled with nanocrystalline cellulose I and nanocrystalline cellulose II.

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Section: Thermal Stability Of Compositesmentioning

confidence: 96%

Thermal and mechanical properties of chitosan nanocomposites with cellulose modified in ionic liquids

Grząbka-Zasadzińska

Amietszajew

Borysiak

2017

J Therm Anal Calorim

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“…Chitosan, a natural polysaccharide composed of (1, 4) -linked β-D-glucosamine is the N-deacetylated derivative of chitin, the second most abundant natural polymer in the world afterward cellulose [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Chitosan can be used in a variety of physical shapes, including beads, films, sponges, tubes, powders and fibers since it is quite soluble under acidic aqueous solutions [1]. Electrospinning is a versatile production method to produce porous fibers membranes with diameters ranging from few micrometers to several nanometers [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of neutralization and cross-linking on the thermal degradation of chitosan electrospun membranes

Correia

Gámiz-González

Botelho

et al. 2014

J Therm Anal Calorim

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Thermal degradation of as electrospun chitosan membranes and samples subsequently treated with ethanol and cross-linked with glutaraldehyde (GA) have been studied by thermogravimetry (TG) coupled with an infrared spectrometer (FTIR). The influence of the electrospinning process and cross-linking in the electrospun chitosan thermal stability was evaluated. Up to three degradation steps were observed in the TG data, corresponding to water dehydration reaction at temperatures below 100 ºC, loss of side groups formed between the amine groups of chitosan and trifluoroacetic acid between 150 -270 ºC and chitosan thermal degradation that starts around 250 ºC and goes up to 400 ºC. The Kissinger model was employed to evaluate the activation energies of the electrospun membranes during isothermal experiments and revealed that thermal degradation activation energy increases for the samples processed by electrospinning and subsequent neutralization and cross-linking treatments with respect to the neat chitosan powder.

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“…Electrospinning of chitosan using different solvent systems will have some limitation in obtaining continuous fibers. An alternative method has been developed by using neutral nonionic form of chitin solutions to make chitin fibers which later can be converted to chitosan fibers through deactylation process [4,26]. Chitin powder was first depolymerized by gamma irradiation to make it soluble.…”

Section: Chitin Nanofibers To Chitosan Nanofibersmentioning

confidence: 99%

“…Alternatively, a controlled and mild method has been developed by using chitin deacetylase, an enzyme that catalyzes deacetylation of N-acetyl-D-glucosamine residues of chitin in to D-glucosamine residues of chitosan [2,3]. Once the degree of deacetylation (DD) for chitin reaches approximately 60 to 70%, it is referred as chitosan [1,4]. Figure 1 shows the multistep process involved to obtain chitin from crab and shrimp shells, and comparative chemical structures of chitin and chitosan.…”

Section: Introductionmentioning

confidence: 99%

Nanofibrous Structure of Chitosan for Biomedical Applications

Bhattarai¹

2012

J Nanomedic Biotherapeu Discover

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Effect of the degree of deacetylation on the thermal decomposition of chitin and chitosan nanofibers

Cited by 137 publications

References 28 publications

Thermal and mechanical properties of chitosan nanocomposites with cellulose modified in ionic liquids

Thermal and mechanical properties of chitosan nanocomposites with cellulose modified in ionic liquids

Effect of neutralization and cross-linking on the thermal degradation of chitosan electrospun membranes

Nanofibrous Structure of Chitosan for Biomedical Applications

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