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The effect of temperature during cellulose compression has been studied using mechanical testing, particle size analysis, density and pressure–volume–temperature (PVT) measurements, crystallinity index, scanning electron microscope photographs and water sorption isotherms. Commercial cellulose powder samples with different crystallinity levels were compacted at high pressure (177 MPa) for 10 min at...
Impressive mechanical properties of cellulose nanocrystals or whiskers have generated great interest from the scientific community as shown by the huge amount of recent literature in this field. It makes them ideal candidates for the processing of polymer nanocomposites. Their outstanding reinforcing capability is classically ascribed to a mechanical percolation phenomenon. At sufficiently high temperature,...
Blue dextrans of varying molecular weights and dye ligand densities have been synthesized and characterized. Reaction conditions, particularly time and dye and base concentrations, have a significant effect on the reaction products. Gel permeation chromatography (GPC) confirms the purity and narrow molecular weight distribution of the products. Blue dextrans are polyelectrolytes due to the ionic dye...
In an attempt to prepare stable dispersions of cellulose nanocrystals in dipolar aprotic solvents, dilute aqueous suspensions of cellulose nanocrystals were prepared by sulfuric acid hydrolysis of cotton. The aqueous suspensions were freeze-dried, and then sonicated in the solvent of interest. Dispersions of 1 and 3% w/v concentration were prepared in polar organic solvents DMSO and DMF. The dispersions...
Suspensions of negatively charged cellulose nanocrystal are obtained by sulfuric acid hydrolysis of cotton cellulose. Within a specific concentration range, the suspensions spontaneously phase separate to give isotropic and chiral nematic phases. Added anionic dyes of varying charge cause separation of an isotropic phase from the highly concentrated, completely anisotropic suspensions; these dyes...
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