E. M. Kulikova

Composites of lignin and polyacrylonitrile as carbon precursors

Films of polyacrylonitrile and lignin cast from dimethylformamide were studied by dynamic thermal analysis in a self-generated atmosphere and in a vacuum. The occurrence of a thermochemical reaction of the components on heating was demonstrated. The optimal conditions of the reaction between polyacrylonitrile and lignin were determined.

Cocarbonization of polyacrylonitrile with lignin

The boundary and parameters of the thermochemical reaction of lignin and polyacrylonitrile were determined by dynamic and isothermal thermal analysis. The time, temperature, and concentration effects of formation of composites, allowing preparation of new carbonizates with enhanced heat resistance and noticeably higher carbon residue, were studied.

Thermochemical Transformations of Hydrolysis Lignin

Conclusions on the reactivity of lignin in thermal processes are made on the basis of published data and results of thermal analysis of lignin samples from certain hydrolysis enterprises.

Morphology of modified hydrolysis lignin

The morphology of hydrolysis lignin was studied. The effect of dimethyl sulfoxide, temperature, and activating additives on the surface characteristics of lignin was examined.

Potential activity of hydrolytic lignin in copolymerization reactions

Structural-molecular characteristics of hydrolytic lignin samples from various factories were studied and their potential activity in copolymerization with polyacrylonitrile was determined.

Problems of solubility of hydrolysis lignin

Interaction of hydrolysis lignin with polyacrylonitrile in water-dimethyl sulfoxide solution in the presence of an activator was studied, and the properties of the products were examined.

Mechanism of low-temperature carbonization of polyacrylonitrile

Low-temperature carbonization of polyacrylonitrile was studied in relation to the synthesis procedure, heat treatment conditions, and presence of natural polymers as cocarbonization participants.

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.

Thermochemical structural transformations of polyoxadiazoles

Changes in the physical and chemical structure of polyoxadiazole upon high-temperature heat treatment of Arselon fiber in inert and oxidizing atmosphere were studied. The role of the morphological rearrangement of the polymer in the turbostratic nucleation of carbon structures was determined. The mechanism of the thermochemical degradation and intramolecular cyclization of intermediate and final polyheterocyclic compounds formed in the process was elucidated.

Thermal Transformations of Polyoxadiazoles

Changes of the structural characteristics and electrical properties of fibers based on polyoxadiazole (Arselon) upon a low-temperature thermal treatment in an inert atmosphere were studied. Extremal dependences of the conductivity of the fibers on treatment temperature were observed and a mechanism of this process was suggested. The X-ray diffraction parameters of the Arselon fibers were determined for the extreme states and practical recommendations were made for using a preliminary heating of the fibers.