Properties of Monocarboxy Cellulose Containing Sorbed Fe(III), Al(III), and Cr(III) Cations

Sorption of Fe(III), Al(III), and Cr(III) on monocarboxy cellulose at various pH, concentrations of metal chloride or sulfate in solution, and time was studied. The effect of type and amount of the cation sorbed on the physicomechanical properties, swelling, and stability in phosphate buffer of monocarboxy cellulose fibers was considered.     

Synthesis, structure, and physicochemical properties of gel-forming dextran phosphates

Dextran phosphates with the degree of substitution of 0.29–1.09 with phosphoric acid groups and of 0.14–0.83 with carbamate groups were prepared in the orthophosphoric acid-urea system. The effect of the component ratio in the esterifying mixture, temperature, and pressure in the reaction zone on the structure and physicochemical properties of dextran phosphate hydrogels and on the gel fraction yield was examined.     

Complexation of Chromium,Aluminum, and Iron Ions with Monocarboxy Cellulose

Complexation of iron(III), aluminum(III), and chromium(III) cations with monocarboxy cellulose was studied by potentiometric titration and IR spectroscopy. The composition and stability constants of the complexes were determined.     

Viscosity of Melts of H Complexes Based on Acidic Diesters of Benzophenonetetracarboxylic Acid and Diaminodiphenylmethane or m-Phenylenediamine

The time dependences of the viscosity of melts of H complexes formed by dimethyl or diethyl dihydrogen 3,3',4,4'-benzophenonetetracarboxylate and 4,4'-diaminodiphenylmethane, m-phenylenediamine, or equimolar mixture of these diamines at 95 and 105°C were studied.     

Complexing of chromium(III) and aluminum(III) cations with phosphorus-containing cellulose-based fibrous sorbent

Sorption of Al³⁺ and Cr³⁺ cations from sulfuric acid solutions with a cellulose phosphate-based fibrous sorbent was examined.     

Sorption of the antitumor drug prospidinum on microgels of polysaccharide phosphates

The intermolecular interaction of prospidinum with gel-forming dextran and starch phosphates has been studied. The sorption equilibria have been studied for cytostatic and the biodegradable hydrogels of polysaccharide phosphates. The concentration coefficients of ion exchange equilibrium and distribution coefficients of prospidinum have been calculated at different degrees of microgel phase filling with the cytostatic, and the relations between the coefficients and the degree of hydrogel swelling have been determined. The ion-exchange and nonexchange contributions to sorption values have been found. The analysis of the distribution coefficients has demonstrated that the concentration of prospidinum sorbed through the nonexchange mechanism is higher than its concentration in an external solution due to the van der Waals interactions between prospidinum cations and macromolecules of polysaccharide phosphates. The Na form of polysaccharide phosphates is the optimal carrier for prospidinum, because this form has a higher density of the total negative charge than their H form has.     

Preparation and physicochemical and mechanical properties of low-substituted cellulose phosphate fibers

Mechanical and physicochemical properties of cotton and viscose fibers esterified with aqueous solutions containing orthophosphoric acid and urea in different ratios were studied.