Plasma polymer adhesion promoters for metal-polymer systems - Polyimides and Other High Temperature Polymers - page 378

However, here, a linear dependence of the OH intensity on the chemical compo-

sition of the gas/vapour mixture is observed. This is reflected in Fig. 20(b). The
ν

ν

CH vibrations.
As described in Section 3.1 the structure of pulsed plasma ethylene homopoly-
mer differs from that of commercial polyethylene. For example, pulsed plasma
polyethylene involves high concentrations of post-plasma oxidised carbon atoms.
This is also to be expected when ethylene is used as chain-extending comonomer.
In copolymers with ethylene units this behaviour is obvious when measuring the
ν

OH signal was referenced to the neighbouring ν

CH vibrations (Fig. 20). With in-
creasing ethylene percentage the number of >C=O groups increases linearly. It
should be noticed that the same tendency was observed when the solubility of co-
polymers in THF was determined. Pure allylalcohol could be dissolved in both
water and tetrahydrofuran but the copolymers with high ethylene percentages
could not be completely dissolved.

C=O vibrations and referencing them to the ν

Figure 17. C1s-XPS spectra of allylalcohol, ethylene and an allylalcohol-ethylene copolymer
(P=100 W, P eff =10 W, duty cycle=0.1, f=10 3 Hz, p=26 Pa).