A. Chenite et al., X-RAY PHOTOELECTRON-SPECTROSCOPY INVESTIGATION OF INTERFACIAL INTERACTIONS IN THE CR BPDA-PDA AND TI BPDA-PDA SYSTEMS, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 12(2), 1994, pp. 513-522
Citations number
26
Categorie Soggetti
Physics, Applied","Materials Science, Coatings & Films
Interfacial interactions of evaporated chromium and titanium with BPDA
-PDA polyimide surfaces have been studied using x-ray photoelectron sp
ectroscopy. The results reveal two stages in the metallization process
. At low coverage, the behavior is dominated by the reaction of metal
with the C=O function, as in the case of PMDA-ODA polyimide. The nitro
gen atoms are slightly perturbed following the C=O attack. At relative
ly higher coverage, additional interfacial reactions occur, involving
the formation of chromium and titanium carbides and nitrides. The resu
lts indicate clearly that the chemical interactions of Cr or Ti at BPD
A-PDA and PMDA-ODA surfaces are quite similar. Thus, the diamine porti
ons, PDA and ODA, can affect the adhesion strength, probably by modify
ing the polyimide chain conformation. In PMDA-ODA, the polyimide chain
is flexible and can rotate around the ether oxygen, while in the BPDA
-PDA the conjugation effect is more important and makes the macromolec
ules more rigid. This is most probably the way by which PDA and ODA se
gments can influence the adhesion performance of polyimide.