Applied Surface Science, Vol.239, No.1, 25-35, 2004
Remote nitrogen plasma treatment of a polyethylene powder optimisation of the process by composite experimental designs
A coupling between fluidised bed and far cold remote nitrogen plasma technologies is used to treat a polyethylene powder in order to increase its wettability evaluated from capillarity rising measurements. An optimisation of the process is performed thanks to face-centred central composite experimental designs. It is shown that treatment duration and oxygen rate added to nitrogen are the more influent parameters. Electron spin resonance analyses revealed the presence of a mixture of alkyl and allyl radicals on the treated powder. Reactions leading to the incorporations of new chemical functions on the polyethylene surface are proposed. (C) 2004 Elsevier B.V. All rights reserved.