EFFECT OF PLASMA-CHEMICAL TREATMENT ON THE PROPERTIES OF ARAMID FIBERS AND POLYMER COMPOSITE MATERIALS BASED ON THEM

The paper presents the results of a study assessing the influence of the parameters of plasma-chemical surface treatment of aramid fiber of the "Rusar" brand on the properties of fibrous filler and composite material with a polyurethane matrix SKU PFL-100 based on them. As a result of evaluating the physical and mechanical characteristics of fibers with a modified surface, a dependence of the behavior of the fibrous material on the power of high-frequency plasma discharges was established. Microstructural analysis of the surface showed the presence of defects resulting from plasma-chemical treatment, which may be due to concomitant processes of oxidative destruction of organic material. At the same time, signs of surface functionalization are noted, expressed in a decrease in the contact angle of modified aramid fibers. It has been shown that plasma-chemical treatment of the surface of a fibrous filler included in a composite material on a polyurethane matrix leads to a change in the physical and mechanical properties of the entire composite. Dependence of strength properties of composite material based on modified filler on power of high-frequency discharges is extreme with maximum of 1000 W. Tendency to increase in physical and mechanical properties of composites with modified aramid fiber with increase in time of plasma-chemical treatment is shown. Approximation of experimental data is carried out and dependences of strength of composite material consisting of polyurethane SKU PFL-100, filled with aramid fiber, on parameters of plasma-chemical treatment of filler surface (power of high-frequency discharge, time of action and nature of plasma-forming gas) were obtained. The recommended mode of modification of the aramid fiber surface by high-frequency discharges of nitrogen plasma in order to increase the adhesive interaction at the matrix-filler interface is: discharge power 1000 W, exposure time 5 min. For citation: Burdikova T.V., Ivshin S.S. Effect of plasma-chemical treatment on the properties of aramid fibers and polymer composite materials based on them. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 5. P. 121-127. DOI: 10.6060/ivkkt.20256805.7153.