Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Plasma desorption time-of-flight mass spectrometry (PD-TOFMS) using accelerated argon ions (9 MeV) has been successfully used for characterizing the surface modifications induced at the surface of poly(ether etherketone) (PEEK) by cold plasma treatments. While the intact polymer structure leads to the emission of negative ions from fragmentation of the repeat unit, the degradation of such a structure under plasma exposure gives rise to production of oxidized fragments. It is demonstrated that this production is highest for a plasma using a mixture of O2 and N2 (20:80), and that as a function of treatment duration, the rate of oxidation of the modified surface layer correlates with adhesive strength, at least in a first step. PD-TOFMS is used for analysis of the failure patterns of epoxyamine adhesive/PEEK/carbon composite in order to localize the fracture position. It is concluded that the increase of the cohesion of the interphase layer as a function of the plasma treatment duration leads to a shift from the interphase/PEEK interface to the bulk of the matrial.
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