Comparative Study of Reactivity of Cellulose,Chitosan, and Chitin-Glucan Complex in Sulfoethylation

Sulfoethylation of the chitin-glucan complex, isolated from mycelium of the mold fungus Aspergillus niger, by substitution with sodium -chloroethylsulfonate or addition of sodium vinylsulfonate is examined. A comparative study is made of the reactivity of the chitin-glucan complex, chitosan, and cellulose in the both reactions. The sorption characteristics of the sulfoethylated products with respect to Cu(II) and Cr(III) are determined.     

Composite Fibers Based on Chitin

Composite fibers containing chitin and cellulose ethers (methyl, hydroxyethyl, and hydroxypropyl cellulose) and also chitin and polyvinylpyrrolidone were prepared. The effect of the ratio of system components and also the molecular weight of polyvinylpyrrolidone on the deformation-strength characteristics of the composite fibers and their supramolecular organization was studied.     

Dehydration of Organic Solvents by Evaporation through Membranes Based on Polyelectrolytic Complexes

Evaporation of binary aqueous-organic mixtures through composite membranes with coatings based on polyelectrolytic complexes including different combinations of polyelectrolytic polycations and polyanions was studied. The possibility of efficient dehydration of organic solvents by their pervaporation was demonstrated.     

Dynamics of Propyl Chitosan Solutions in Longitudinal and Shear Modes

Low-substituted chitosan was synthesized from shrimp chitin. The effect of the ionic strength on the dynamics of acetic acid solutions of propyl chitosan in longitudinal and shear modes was studied. The dynamic characteristics of these solutions under the action of hydrodynamic fields were estimated.     

Synthesis and Microbiological Stability of Graft Copolymers of N-Vinylpyrrolidone and Chitosan

The kinetics of homogeneous graft polymerization of N-vinylpyrrolidone on chitosan, initiated by ammonium peroxodisulfate, was studied in relation to the reactant concentrations. The reaction orders with respect to the monomer, initiator, and matrix polymer were determined. The compositional nonuniformity and microbiological stability of the copolymer were evaluated.     

Cocarbinization of Blends of Polyacrylonitrile with Chitin and Chitosan

The possibility of thermochemical cocarbonization of polyacrylonitrile with chitin and chitosan by combined heat treatment of their blends was examined. It was concluded that the components form complexes in dimethylformamide and dimethylacetamide at the temperature of polyacrylonitrile cyclization (230–300°C). The main thermal characteristics and the coke numbers of the cocarbonization products were determined.     

Chemical Composition and Properties of Cultivated Wood-Rotting Fungi Phanerochaete Sanguinea and Ganoderma Applanatum

The fruit body composition of the cultivated wood rotting fungi Phanerochaete sanguinea 16-65, Ganoderma applanatum 4-94, and Ganoderma applanatum 40-90 and their sorption characteristics with respect to Cr(III) and Methylene Blue are studied.     

Carbonization of Polyacrylonitrile Composites with Nitrogen-containing Cellulose Derivatives

Thermal carbonization of nitrogen-containing cellulose derivatives (chitin, chitosan, cyanoethyl chitosan, cyanoethyl cellulose, copolymers of allyl carboxymethyl cellulose with polyacrylonitrile) as models of probable products of thermal reaction of cellulose with polyacrylonitrile was studied. The quantitative characteristics of carbonization of the model compounds are influenced by the nitrile group.     

Hydrolysis of Chitin-Glucan Complex of Aspergillus niger Fungus with Phosphoric Acid

The kinetic parameters of hydrolysis of chitin-glucan complex of Aspergillus niger fungus with 85% phosphoric acid were studied at three temperatures. The activation energies of hydrolysis of chitin and glucan components of the complex were determined.     

Structure of Aqueous Methyl and Propyl Methyl Cellulose Solutions in the Initial Stage of Gelation

Evolution of the supramolecular associate structure of moderately concentrated aqueous methyl and propyl methyl cellulose solutions, as dependent on the degree of substitution by propyl groups, is studied by the polarized light scattering using the Debye-Bueche-Stein theory.