Surface modification of polypropylene with an atmospheric pressure plasma jet sustained in argon and an argon/water vapour mixture

► Plasma jet in Ar/water vapor mixture for polypropylene film modification. ► Rotational temperature of OH radicals is around 650 K in active zone of the jet. ► Plasma treatment can add up to 15.1% of oxygen containing groups to the PP surface. ► The adding water vapour to the argon feeding gas results in a more pronounced oxygen incorporation.