Polymer Science, Series D最新文献

This article presents a new method for predicting the durability of anticorrosive paint coatings based on the analysis of their electrochemical properties. This method is based on studying changes in the measured resistance and capacitance of coating and the calculated capacitance–frequency coefficient under the influence of electrolytes in a wide range of alternating current frequencies. This article describes the sequence of calculating the capacitance–frequency coefficient and its use to determine the service life of a coating.

Currently, the trend of using wood–polymer composites based on thermally modified wood filler becomes to be popular. The chemical structure of a filler, however, changes and the adhesion between components worsens during thermal modification, which decreases the mechanical properties of a composite. Ozone treatment of a filler after thermal modification is proposed in this work. The results showed that ozonation can significantly improve the interaction between filler and hydrophobic polyethylene, which enhances the properties of a final composite.

The main areas and advantages of shell casting technology application in manufacturing parts of ground transport and technological machines and complexes are analyzed. Specifics and prospects of application of silicone molds manufactured on the basis of 3D master models from various types of thermoplastic polymer composite materials are reflected in detail. The main parameters influencing the quality and accuracy of manufactured silicone molds are defined. A mathematical model for selecting the optimal strategy for reducing labor intensity is developed, taking into account controlled and uncontrolled effects arising within the technological process’ framework at the stage of manufacturing a silicone mold.

A thermal protective polymer coating was created using polyether urethane rubber with epoxy-urethane end groups, chlorine-containing epoxy oligomers cured by a mixture of aromatic amines, resorcinol, and melamine polyphosphate as a filler. The structure and properties of the coating were studied.

The influence of 3D printing modes on the tightness of parts manufactured from ABS and PETg+GF12 (GFmax) plastics by 3D printing was studied. Recommendations for choosing the degree of filling of the internal structure to maintain wall rigidity were developed. The main defects causing violation of tightness were considered, and methods for preventing their occurrence were proposed.

The paper considers certain aspects of creation of novel polymer flame retardants for cellulose materials. The fire-retarding characteristics of the novel polymers are determined.

The work is devoted to a study of a possibility of creating films based of polyvinyl alcohol with improved operational properties that can be used as packaging materials. It is found that introducing flame-retarding additives to the formulation of the films makes it possible to increase their heat resistance, fire resistance, and capacity for biodegradation.

The article considers some aspects of decreasing the flammability of synthetic polymer materials. It is shown that the flammability of polymers and compositions based on them is determined not only by the nature of the polymer, but also by the composition of the formed gas, as well as presence of noncombustible products in the gas phase. A linear dependence between flammability and heat resistance is possible for polymers with similar structures only.

Theoretical aspects of fixing workpieces on cutting machines using polymer compositions are considered. Theoretical calculations obtained in the part of the study of factors influencing the possibility of reliable fixing of the workpiece on the polymer composition are presented. Methods and calculation schemes for determining the applicability of the method of deformation-free fixing of workpieces on the polymer nanocomposite are obtained. The elastic compliance of the polymer layer is determined to determine the permissible cutting forces of the finishing pass.

The structure and the adhesive strength of a fiber–matrix in polyimide carbon-fiber-reinforced plastic in the starting state and after the effect of temperature are studied. The highest increase in porosity and clear decrease in adhesive strength were observed for carbon-fiber-reinforced plastic after thermal aging at 320°C for 200 h.