Surface modification of low density polyethylene (LDPE) film by low pressure O2 plasma treatment

Constraints on the adhesion of viscous threads spun by orb-weaving spiders: the tensile strength of glycoprotein glue exceeds its adhesion

“…This process alters the film's surface properties and 'as polar groups are introduced on the surface, the surface energy of PE can increase from about 33 to 55mJm -2 ' (Mangipudi and Tirrell, 1996). Other procedures, such as low pressure O 2 plasma treatment, can produce LDPE with surface energies as high as 69mJm -2 (Sanchis et al, 2006). Consequently, we believe that our values are accurate.…”

Effects of operating parameters on DC glow discharge plasma induced PET film surface

“…The introduction of oxygen containing polar groups on the polymer surface may be the main reason for the hydrophilic improvement. Since PET films were treated in air plasma, it is obvious that some nitrogen-containing group will be incorporated onto the surface [2,4,9]. For untreated polymer films, there is no N1s peak but for plasma treated one, there appears to be a small N1s peak.…”

“…Primarily, a glow discharge plasma treatment provides many possibilities to refine a polymer surface, enabled by the adjustment of parameters like gas flows, power, and pressure and treatment time. Depending on the gas composition and plasma conditions, ions, electrons, fast neutrals, radicals and UV-Vis radiation contribute to the polymer treatment, resulting in etching, activation and/or cross- linking or, in many cases, combined effects can be obtained [4][5][6]. The glow discharge plasma can be generated with either a DC or RF power source.…”

Extreme durability of wettability changes on polyolefin surfaces by atmospheric pressure plasma torch

“…Further reactions of the formed radicals with atmospheric elements during storage led to a second slight increase of the γ s and polarity after 21 days for HDPE and PP. Finally, a total (LDPE) or partial (HDPE, PP) recovery of energy was observed after 270 days, being due to possible recombination of reactive functional groups with environmental species, re arrangement of oxygen and nitrogen containing moieties or reorientation of polar groups from surface to bulk, which led to a diminished hydrophilicity [21]. Besides the change in chemical composition of the surfaces, APPT is also known to promote etching as a consequence of the plasma flux impact onto the surfaces, creating roughness which contributes to the increase in polar properties and their durability.…”