Impact of Radio-frequency Atmospheric-pressure Plasma on Water Contact Angles of High-impact Polystyrene

Abstract

For some applications of plastic materials, such as polystyrene, an important role is played by the wettability of the material. One of the methods of modifying material properties such as water contact angle is using nonthermal plasma. In this study, a radio-frequency atmospheric -pressure plasma jet source has been applied to the surface modification of a high-impact polystyrene film. The measurements show a dependence between the change in the water contact angle and the operating parameters of a nonequilibrium plasma treatment, such as the composition of the working gas, the flow rate, the distance from the plasma zone, and the discharge power.

Weathering and degradation of polylactic acid masks in a simulated environment in the context of the COVID-19 pandemic and their effects on the growth of winter grazing ryegrass

“…3 (k, l, m, n, o). The material is considered hydrophobic if the contact angle θ is higher than 90°; if it is low, the material is considered hydrophilic(2018) [1] . In general, the three layers of the fiber fabric changed from hydrophobic to hydrophilic, and the change in the inner mask was more obvious after the weathering process.…”

Deposition of a polymer thin film on a silver surface for surface plasmon sensing

“…To verify the hydrophilicity enhancement, we measured the contact angle of a water droplet. The contact angle θ can be determined using the half-angle method, 23) where θ is expressed by the following equation: Spin coating of each substrate was executed right after the plasma treatment (<60 s). We dropped a 400 μl PMMA toluene solution with 8.0 mg/ml concentration onto the silver surface of the substrate and spun the substrate with rotation speeds of 3000, 4000, and 8000 rpm for 60 s using a spin coater (1H-D7, Mikasa Co.).…”