Influence of basalt fibers plasma modification on the physical and mechanical characteristics of peek-based laminates

The paper presents the results of the effect of basalt fibers low-temperature atmospheric discharge plasma with runaway electrons surface treatment on the physical and mechanical characteristics of polyetheretherketone(PEEK)-based laminates. A comparison is made with the results of studies of similar composites reinforced with carbon fiber subjected to plasma treatment at the same exposure times. It is shown the use of preliminary plasma modification leads to a significantly better wetting of the fiber surface with a polymer after 5 minutes of treatment. After a 10-minute treatment signs of degradation of the surface structure of basalt fibers are observed, accompanied by the formation of microdamages, which contributes to an increase in adhesion to the binder, but leads to a decrease in the strength characteristics of fibers and composites. When carbon fibers are processed for 10 minutes, small erosion marks appear on their surface, which contribute to an increase in interfacial adhesion, but are not so critical from the standpoint of reducing tensile strength. The revealed discrepancy in the nature of the effect of plasma on basalt and carbon fiber is explained by differences in the conductivity properties of reinforcing materials, which affects the intensity of damage to their structure during processing, and, consequently, the deformation-strength characteristics of both the fibers themselves and the composites reinforced by them.

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