The large availability of cellulose in nature and the low cost of cellulose derivatives make the cellulosebased hydrogels particularly attractive. New hydrogels were obtained by chemical cross-linking of different cellulose allomorphs (cellulose I, cellulose II and cellulose III) and xanthan with epichlorohydrin. The preparation conditions of the transparent cellulose hydrogels were established. The equilibrium swelling capacity of the obtained hydrogels

Amorphous cellulose was obtained from different types of celluloses (microcrystalline cellulose, dissolving pulp and cotton cellulose), by regeneration with ethanol from their solutions in an SO2-diethylaminedimethylsulfoxide (SO2-DEA-DMSO) solvent system. Different techniques, X-ray diffraction (XRD), FTIR spectroscopy and differential scanning calorimetry (DSC) were used to estimate the crystallinity degree. The values obtained for amorphous celluloses

Although, within plant cells, the cellulose chains are organized in variable and complex ways, relatively little attention has been paid to the relationship between this "fine-structure" of cellulose and its biodegradation. This work focuses on the influence of the substrata and enzyme concentrations on the enzymatic hydrolysis of microcrystalline cellulose. To determine the effect of the supramolecular structure on the enzymatic degradation of cellulose,

A new synthesis pattern of adamantoyl esters of cellulose (AdTMSC) is described. The process was approached by two steps. The first one consists in the obtaining of trimethylsilylcellulose (TMSC), by reacting cellulose in N,N-dimethylacetamide/lithium chloride (DMA/LiCl) solution with chlorotrimethylsilane and hexamethyldisilazane. The AdTMSC was synthesized by reacting trimethylsilylcellulose with 1-adamantanecarbonyl chloride,at 130°C. The obtained

This study was focused on the changes in the fine structure of cellulose samples of different origin during treatment with sodium hydroxide solution. Three types of cellulose, microcrystalline cellulose, spruce dissolving pulp and powder linters cellulose were alkalized with solution of sodium hydroxide of different concentrations, at -30°C. After alkalization the samples were defrozed, washed until neutral and dried in air. The structural changes

The complexity of cellulose thermal degradation results from the large number of parallel and consecutives reaction steps, from the change of the predominant reaction route with degradation temperature, from the intense influence of the ambient atmosphere on the degradation process and, last but not least, from the important role played by the structure of cellulose sample in thermal degradation. To determine the effect of the supramolecular structure