Influence of Modification of Aramide Fibers on the Strength of Composite Materials

The paper presents the results of studies to assess the possibility of improving the physical and mechanical characteristics of composite materials due to high-frequency plasma treatment of the surface of aramid fibers. A comparative assessment of the effect of the nature of the plasma-forming gas on the physical and mechanical properties of aramid fibers and composite materials based on them, impregnated with a polyurethane binder based on a prepolymer SKU PFL-100 produced by JSC Kazan Synthetic Rubber Plant, cured with 4,4'-methylene-bis- (orthochloaniline) (MOСA). As a result of the studies carried out, the influence of the parameters of high-frequency plasma treatment on the physical and mechanical characteristics of aramid fibers and composite materials based on significant effect on the properties of the modified fiber. The highest values of physical and mechanical characteristics were obtained for aramid fibers modified in methane and composite materials based on fibers modified in nitrogen. The effect of the nature of the plasma-forming gas on the physicomechanical characteristics of composite materials based on aramid fibers at negative temperatures has been established. of high-frequency plasma treatment on the physical and mechanical characteristics of aramid fibers and composite materials based on them was determined. It is shown that the nature of the plasma-forming gas has a significant effect on the properties of the modified fiber. The highest values of the physical and mechanical characteristics of the fibers were obtained for aramid fibers modified in methane, which corresponds to an increase in strength by 16.5% and an elastic modulus by 93.7% compared to the original fiber; for composite materials based on fibers modified in nitrogen, which corresponds to an increase in strength by 11.8% and elastic modulus by 9.6% compared to the original fiber. The possibility of regulating the behavior of composites under negative temperatures by changing the nature of the plasma-forming gas is shown.