Epoxy Resin Surface Functionalization Using Atmospheric Pressure Plasma Jet Treatment

Abstract

Atmospheric pressure plasma jet (APPJ) of N2 has been applied to promote adhesion between the epoxy resin post and composite core material due to the chemical active functional groups created. The APPJ was proved to be able to improve adhesive ability of the epoxy resin through the polar groups such as carbonyl group on its surface revealed by decreasing contact angle. The jet was generated from N2/Ar and N2/He gas mixture with ratio as low as 0.40–0.44 vol %, respectively. The optical emission spectrometry showed that the active species which could react with the substrate surface are nitrogen molecules and nitrogen molecules ion. The radial distribution functions (RDFs) calculations indicated that the most probable position of nitrogen active species reacting on the epoxy surface is at hydroxyl group with hydrogen bonding distance less than 35 nm.

Effect of an additional floating electrode on radio frequency cross-field atmospheric pressure plasma jet

“…Interaction of the charged particles in this plasma with the ambient air produces reactive oxygen and nitrogen species (RONS) 9,10 , and their low gas temperature provides a conductive environment for the interaction with the biological cells and tissues 11 . All these peculiarities of APPJ suggest them as a potential candidate for biomedical applications [12][13][14][15] , surface treatment and modification 16,17 , thin film deposition 18,19 , food technology 20,21 , and environmental applications 22 . Plasma jets ignited by radio frequency are proven to be more efficient in terms of power coupling and require relatively lower breakdown voltage compared to other sources such as pulsed DC and AC 23 .…”