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XPS studies of the ageing of plasma-treated polymer surfaces

✍ Scribed by Paynter, R. W.

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 149 KB
Volume: 29
Category: Article
ISSN: 0142-2421
DOI: 10.1002/(sici)1096-9918(200001)29:1<56::aid-sia693>3.0.co;2-2

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✦ Synopsis

Polystyrene and polyethyleneterephthalate (PET) coupons were exposed to r.f. plasmas containing helium, oxygen and nitrogen. The modified surfaces were characterized by x-ray photoelectron spectroscopy shortly following plasma treatment and after storage in air for about 360 days. The oxygen concentration in polystyrene treated with plasmas for at least 30 s was found to tend to a value of 12-14% following storage. Polystyrene exposed to a helium plasma took up additional oxygen during storage, mainly in C O, O-C O and O-C O groups. Polystyrene exposed to a nitrogen/hydrogen plasma lost nitrogen over time but took up oxygen in single, double and multi-atom bond configurations. Polystyrene exposed to an oxygen/helium plasma lost oxygen over time, especially from pendant groups in which carbon was bonded to three oxygen atoms. The evolution of polystyrene and PET samples exposed to combinations of oxygen and nitrogen plasmas is also discussed.

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