Surface modification of poly(biphenyl dianhydride-para-phenylene diamine) (BPDA-PDA) polyimide by UV photo-oxidation

摘要

Poly(biphenyl dianhydride-para-phenylene diamine) (BPDA-PDA,Upilex-S) polyimide (PI),was exposed to 185 and 254 nm UV radiation in the presence of oxygen at atmospheric pressure.SEM micrographs revealed only a small change in surface morphology following treatment.XPS showed an approximate doubling of the O/C ratio on the modified surfaces which appeared mostly as the carbonyl moiety.UV photo-oxidation degraded Upilex-S to produce a locus of failure below the interface (cohesive failure).XPS and TOF-SIMS results indicated that the Upilex-S thickness remaining on sputtered Cu after the tape test on the Cu-modified surface was<= 10 nm.Cohesive failure occurred at shorter treatment times when Cu was sputter coated on modified BPDA-PDA than on poly(pyromellitic dianhydide-oxydianiline) (PMDA-ODA) PI.