This study reveals the interfacial properties of multicomponent plasma with four aspects, including cleaning, etching, functionalization, and polymerization. Particles formed by plasma ionization collide to form volatile groups, which can interact with the surface to form volatile substances that clean the surface. The multicomponent plasma etching effect on the surface is significant, and O 2 and N 2 may interact to improve oxidation capacity. Inert gas argon (Ar) can be combined with reactive gases O 2 , N 2 , and NH 3 to introduce hydroxyl and amine groups and other active groups to change the surface's chemical structure. When a multicomponent plasma polymerizes, a film forms on the surface, changing the chemical composition. The cross-linking of gases has a positive effect on the properties of the deposited layer as well. The treatment of various fiber materials, nanoparticles, polymer films, and matrix materials with multicomponent plasma is summarized. The multicomponent plasma significantly improves surface wettability and roughness, and oxygen species aid in the etching of nanomaterials, which improves interface properties. The gas types determine the groups introduced to the surface and the surface attachment site.
This study reveals the characterization and mechanical properties of glass fiber warp knit structural fabric/vinyl ester resin composites treated by cold nitrogen glow discharge plasma. The effects of nitrogen plasma treating parameters (including power, flow rate, and time) on tensile and bending properties of glass fiber warp knit structural composites were investigated. It was shown that nitrogen plasma treatment enhanced the tensile and bending property of the glass fiber warp knit structural composites. SEM, FTIR and AFM characterized etching existing on the surface, C-N and N-H groups were introduced, and varying degrees of roughness. The response surface analysis represented that the nitrogen plasma treated glass fiber warp knit structural composites obtained optimized bending properties with the power ranging from 130 W to 160 W, the flow rate ranging from 8sccm to 9sccm, and the time ranging from 100s to 110s.
This study reveals double plasma modification of ultra‐high molecular weight polyethylene (UHMWPE) fibers by oxygen/argon duoplasmatron source to investigate the synergistic effect of double plasma mixture on the mechanical performance of UHMWPE/vinyl ester laminated composites. The single‐factor experiment was used to determine the preparation process parameter range. The modified fiber was characterized and mechanical properties of UHMWPE/vinyl ester composites were evaluated. The results showed that the UHMWPE fiber modified by double plasma treatment with oxygen/argon duoplasmatron source exhibited more hydroxyl groups than untreated fiber and the single plasma‐modified fiber with oxygen source, and the surface water adsorb capacity was significantly improved, which contributed to the combination of resin and fiber surface. The tensile strength of the composite with double plasma modification increased to 380.48 MPa, which was higher than untreated and oxygen plasma treated samples by 36.9% and 18.9%, respectively. The GIC value was even 78.1% higher than that of oxygen plasma‐treated sample, and the interlaminar shear strength was increased by 19%. In terms of low‐velocity impact response, the absorbed energy of double plasma modified composites was increased, confirming that the mechanical resistant performance was enhanced by the modification with oxygen/argon duoplasmatron source.
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