Effect of Irradiation Power on Surface Modification of Polyester by Ammonia Plasma Treatment

Abstract

The power dependence of nitrogen functional group introduction treated with ammonia plasma on poly(ethylene terephthalate) (PET) and liquid crystal polymer (LCP) was investigated. The ratios of NH2 and N–C=O groups, which are the introduced functional groups, differ depending on the power used for plasma generation. The ratio of N–C=O groups increases with increasing power. For PET, the introduction of oxygen functional groups occurs at low power. Power dependences of contact angles were found for PET and LCP. They are related to the different types and quantities of functional groups with respect to the power. A considerable decrease in contact angles is apparent at the low-power side of 0–15 W.