Plasma polymer adhesion promoters for metal-polymer systems - Polyimides and Other High Temperature Polymers - page 368

continuous wave plasma shows two large peaks (Fig. 5). One peak is situated in
the region of moderate molar mass and has high intensity and moderately broad
molar mass distribution. The second one is located in the very high molar mass
range and represents molar mass > 10 7 Da. The other species (P = 3 W continuous
wave and P eff = 3 W pulsed plasma) show intense peaks in the low molar mass
range and diffuse, low intensity peaks in the very high molar mass range. After
calibration with a mixture of polymer standards as reference, the first peak in Fig.
6 can be set to about 19.7 kDa, attributed to linear homopolymers, and the second
one to about 4.3 10 4 kDa (see Fig. 6), due to highly branched or weakly

crosslinked molecules. From AFFFF the very high molar mass fraction cannot be
identified (Fig. 7). However, the low and moderate molar mass fractions are
clearly resolved. In the AFFFF elugram of plasma polymerised polystyrene at 100
W continuous wave plasma the first peak in the low molar mass range could be
split into two components at about 23 and 33 kDa. Furthermore, in the oligomer
fraction an additional low-molar mass fraction of a molar mass

×

≈ 6 kDa was iden-

tified (Fig. 8).

Figure 7. AFFFF elugrams of continuous wave and pulsed plasma polymerised polystyrene
(MALLS - Multi Angle Laser Light Scattering detector; EASICAL - mixture of polystyrene stan-
dards for calibrating).