Keyword: «carbon fiber»

An urgent task in the production of polymer composite materials is to increase the elastic-strength properties by adding various modifiers, using various polymer matrices and formulations, changing reinforcing fillers and combining them. The last method is the most interesting. As the literature analysis of modern scientific works has shown, with this method there is a synergistic effect of increasing the strength of the material and reliability under various types of load. This paper presents the comparative results of tensile and bending tests on original hybrid, pure, and modified basalt, glass, and carbon plastics. The combination of basalt and glass fibers with carbon fiber, which has high rigidity, made it possible to increase the tensile strength to 9,5% and 9,3%, respectively, and to 39,5% and 2,6%, respectively, for bending.

This paper investigates the adhesive strength of elastomeric matrix materials and reinforcing fabrics. The production of materials based on two incompatible components to obtain a composite and, in turn, improve its physical and mechanical properties, is a pressing issue. The effect of surface treatment on high-modulus fabrics and rubbers based on butadiene rubber SKD-B was studied. Two methods were used to increase adhesive strength. The first method involved treating the surface of basalt, glass, and carbon fabrics with a rubber mixture to improve contact with the rubber layers. The second method involved applying a primer and Chemocil adhesive, which is used to bond rubber to metal. During the delamination test, an increase in adhesive strength compared to the original rubber was observed in the sample with Chemocil surface treatment.

The technology of obtaining and complex properties of polyurethane composites reinforced with carbon fiber are investigated. The key problems of modern research (insufficient interfacial adhesion, low thermal and moisture resistance, and uneven fiber distribution) are identified, and a comprehensive approach to their solution is proposed, including optimization of the polyurethane matrix formulation, pre-treatment of carbon fiber, and regulation of molding/curing parameters. Mechanical (stretching, bending, impact strength) and thermal (DSC, TGA) studies have evaluated the properties of composites with different carbon fiber content. It is shown that at 15 wt. % fiber content composites demonstrate optimal mechanical properties, and the regulation of curing significantly improves their thermal stability. The study provides a theoretical and technical basis for a wide range of engineering applications of the results obtained.