Introduction of Primary Amino Groups on Poly(ethylene terephthalate) Surfaces by Ammonia and a Mix of Nitrogen and Hydrogen Plasma

Casimiro, Jessie; Lepoittevin, Bénédicte; Boisse-Laporte, Caroline; Barthés-Labrousse, Marie-Geneviève; Jegou, Pascale; Brisset, François; Roger, Philippe
April 2012
Plasma Chemistry & Plasma Processing;Apr2012, Vol. 32 Issue 2, p305
Academic Journal
With the aim of introducing primary amino groups on the surface of poly(ethylene terephthalate) (PET), two methods were compared-the use of ammonia or a combination of nitrogen and hydrogen low-pressure microwave plasma. Several plasma parameters were optimized on the reactor to increase the -NH surface density, which was estimated by colorimetric titration and X-ray photoelectron spectroscopy (XPS). These techniques show that whatever the plasma treatment, almost 2 -NH/nm² are incorporated on PET films. Emission spectroscopy highlighted a correlation between the density of primary amino groups and the ratio between an NH peak intensity and an Ar peak intensity (I/I). Variation in surface hydrophilicity with aging in air after plasma treatment was monitored with contact angle measurements and showed a hydrophobic recovery. This was confirmed by XPS, which suggests also that surfaces treated by NH plasma are more stable than surfaces treated by N/H.


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