Study of Bonded Plasma-Treated Polyetherimide Components for Power Integration: Durability in a Hot/Wet Environment

Adhesion behavior of different annealed polyphenylquinoxaline foils treated using low pressure plasma

“…The surface roughness caused a mechanical interlocking between the adhesive and the PPQ surface. Other researchers reported that the increase of adhesion strength of treated high performance plastics (PPS, PEI, PI, and PEEK) using lp‐plasma besides the removal of weak boundary layer, the increase of surface roughness were also attributed to the increase of surface energy, especially the polar parts …”

“…Extensive investigations of adhesion improvement were reported with conventional technical plastics . In previous studies, the enhancement of the adhesion of lp‐plasma (H 2 , NH 3 ) treated poly(tetrafluoroethylene (PTFE) and the adhesion of PTFE and tetrafluoroethylene perfluorovinyl ether copolymer (PFA) both treated with TMB(trimethoxyborane)/H 2 /He plasma have been related to the removal of fluorine atoms from the polymer surface rather than to the presence of polar functions at the surface.…”

“…Meanwhile, the gluing of thermally stable plastics polyimide (PI), polyether ether ketone (PEEK), polyphenylene sulfide (PPS), and polyetherimid (PEI) and their adhesion improvement by means of environmental friendly surface treatments were previously studied . The higher bonding strength of PPS, PEI, PEEK after treatment with lp‐plasma or APP was found to be caused by the higher polar surface energy and the increase of surface roughness . Comyn et al and Seidel et al attributed the increase of the surface energy of lp‐plasma treated PEEK to the increase of the amounts of oxygen and nitrogen, and to the creation of new surface groups (carbonyl and hydroxyl).…”

“…Comyn et al and Seidel et al attributed the increase of the surface energy of lp‐plasma treated PEEK to the increase of the amounts of oxygen and nitrogen, and to the creation of new surface groups (carbonyl and hydroxyl). Other researchers found that the increase of surface energy of PEI after treated with lp‐plasma resulted from the removal of release agent and carbon and from the creation of polar species, esters, or carboxylic acid groups …”

Viscosity effect on epoxy-diamine/metal interphases—Part II: Mechanical resistance and durability

“…Stabilization is reasonably expected for the non-modified system, such as already observed on a similar system (DGEBA/DDM) [22]. On the other hand, for the modified system, the effect of a very long ageing time cannot be easily envisaged, in particular because of the presence of crystallized particle which could lead to an irreversible degradation, as already seen on complex adhesive systems [23].…”