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Surface treatments and coatings
Application example : Plasma treatment on PET, XPS study of surface chemistry induced modifications
XPS
, grazing angle (analyzed depth 2 nm) was used to determine the chemical composition and speciation of a reference Mylar film, and of a plasma treated Mylar film.
The XPS signatures (elemental composition and carbon/oxygen chemical forms distribution) of the
non-treated PET
are in very good agreement with a theoretical PET.
Hence, the analysed PET polymer is contaminant free (Si, N…).
After plasma treatment
, the shake-up characteristics of the PET structure are always observed,
which indicates that the grafting thickness is < 2 nm and/or does not affect the aromatic structure of the PET.
The plasma induces also
nitrogen grafting, mainly as amide N-C=O form.
In addition,
amine N-C, imide N(CO)
2
and carbonyl C=O are also detected and quantified.
Survey spectra and high resolution spectra are presented hereafter:
Composition table (table I) and chemical environment table (table II) are presented hereafter :
Theoritical PET :