Options
2009
Journal Article
Titel
Density and aging behavior of primary amino groups on afterglow plasma-treated low-density polyethylene (LDPE)
Abstract
Quantitative determination of primary amino group densities using chemical derivatization (CD) ATR FT-IR spectroscopy was applied to study the amination rate in N2 + NH3 and Ar + NH3 dielectric barrier discharge afterglows. Compared to N2 + H2 mixtures and pure N2, the initial plasma-amination rate is reduced, presumably due to a smaller concentration of reactive species that are consumed by reactions with NH3. The aging behavior of LDPE samples plasma treated in the afterglow of N2, N2 + H2, and N2 + NH3 discharges was also studied using CD XPS and CD ATR FT-IR measurements over a period of 6 weeks after the treatment. Using gas mixtures of N2 + H2, the highest amount of primary amino groups was obtained. It has been ascertained that the primary amino groups are not stable during the storage under ambient conditions due to the oxidation of the surface and migration processes.