Pretreatment And Surface Modification Of Polymers Via Atmospheric-Pressure Plasma Jet Treatment

Abstract

Fluoropolymers are difficult materials to modify the surfaces because of strong C-F bonds. In this study, the surface modification of fluoropolymer films such as polytetrafluoroethylene (PTFE) with amino groups was performed by using He/NH 3 gas mixture atmospheric pressure plasma jets with negatively-biased substrate. It is expected that the ion bombardment effect onto the polymer surface due to negative substrate bias will make dangling bonds over the polymer surface and eventually promote the surface modification. From XPS analysis, we confirmed the breaking C-F bonds and creating CC , C=O or C-N bonds in C 1s spectrum and increasing nitrogen-containing functional groups in N 1s spectrum. Fluorescence patterns were observed on the amino group functionalized PTFE surface by using the fluorescent dyes selectively connecting with the amino groups. With a spectrophotometric method, the surface concentration of amino groups introduced onto the PTFE surface was evaluated to be roughly 3.86 nmol/cm 2 .

Physical mechanisms of interaction of cold plasma with polymer surfaces

“…Not only the chemical structure but also the roughness of the surface is affected by the plasma treatment, which also could change the wettability of the surface [18]. Plasma treatment usually strengthens the hydrophilicity of treated polymer surfaces.…”

Nano-rugosidade gerada em amostras de polímero PEAD através de plasma RF de N2/O2

“…O tratamento por plasma produz mudanças físico-químicas na superfície do polímero, as quais podem alterar a rugosidade que, por sua vez, pode mudar a molhabilidade da superfície [18,19]. Também, o plasma pode gerar grupos funcionais que deixam a superfície polimérica mais hidrofílica.…”

Introduction of Atmospheric Pressure Plasma to Aqueous Detergent Processes

“…In a previous study 13 , we observed a considerable increase in the roughness of the single fiber surface after the APP treatment of PET fabrics. Such topographical changes can arise from thermal effects of the plasma or from chemical reactions and sputtering 25 . Figure 4 shows optical microscopic images of stearic acid deposited on the PET film.…”