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Nanocrystalline cellulose (NCC) is a promising nanofiller for reinforcing chitosan (CTS) film. The flocculation of the NCC suspension in acidic CTS solution is the key problem that makes many properties such as the tensile strength bad. A derivative of nanocellulose, namely cationic dialdehyde cellulose (CDAC), is synthesized in the current study to avoid the flocculation. A CDAC suspension is prepared...
A new derivative of chitosan was prepared via a chemical modification process which included chemical bonding of chitosan with d-penicillamine and anchoring of Pd(II) to the chitosan-d-penicillamine. Chitosan-modified Pd(II)-d-penicillamine was characterized by FT-IR, CHNS analysis, flame absorption atomic spectroscopy, energy dispersive X-ray spectroscopy, X-ray diffraction pattern and thermal gravimetric...
Oxidation of cellulosic materials is required in many fields such as textile processing, natural fiber composites, medical utilization, and so on. The present study was designed to explore the possibility of ozone treatment as a greener oxidation process for jute fibers. Ozone gas was used for the treatment of waste jute fibers for different time periods in a humid atmosphere. Several characterization...
Gamma irradiation is a common process mostly used for sterilization against bacteria growth. However, when the process is applied to a material, physical and chemical changes may alter its integrity and behaviour. The aim of this study was to observe the effect of γ-irradiation on the surface chemistry of CNCs. The carbonyl content (both carboxylic acid and aldehyde functionalities) was followed to...
2,2,6,6-Tetramethylpiperidine-1-oxyl radical (TEMPO) can selectively oxidize primary hydroxyl groups of cellulose to carboxyl groups. However, the depolymerization also occurs during the process. The kinetics and mechanism of carboxyl group formation on the surface of cellulose fiber oxidized by TEMPO/NaClO2/NaClO were discussed. The oxidization and depolymerization of cellulose occurred simultaneously,...
Cellulose nanocrystals were successfully oxidized with sodium hypochlorite using catalytic amounts of sodium bromide and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical at pH 10 in water. Carboxylate groups were selectively introduced at the surface of the crystals up to a total acid content of 1200 mmol kg−1 without damaging the integrity of the crystals. The final acid content can easily be...
Cellobiose, a dimer of glucose wearing a glycosidic bond as in cellulose, was used as model molecule to understand the chemical degradation pathways taking place in iron gall inks impregnated papers. Experiments were carried out in liquid phase at 80 °C to study the effects of pH and of the presence of iron and oxygen on the cleavage of the glycosidic bond. Capillary electrophoresis was used to quantitatively...
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