Adhesion, Reaction and Stability of Metal/Polyimide Interfaces

1989 ◽  
Vol 167 ◽  
Author(s):  
J. Kim ◽  
S. P. Kowalczyk ◽  
Y. H. Kim ◽  
N. J. Chou ◽  
T. S. Oh
Keyword(s):  
Electrical Properties ◽  
Chemical Bond ◽  
Adhesion Strength ◽  
Interfacial Reactions ◽  
Great Care ◽  
Metal Interface ◽  
Term Stability ◽  
Long Term Stability ◽  
Mechanical And Electrical Properties

AbstractInterfacial reactions of polyimide with several metals have been investigated by XPS and TEM to determine their effects on adhesion and long term stability. It has been found that the polyimide-on-metal interface and the metal-on-polyimide interface are intrinsically different; in the case of PI-on-metal interface, the precursor of polyimide, polyamic acid, reacts with the metal resulting in a strong chemical bond and therefore, higher adhesion strength than the corresponding metal-on-PI interface. Both interfaces are found susceptible to T/H environment, resulting in significant adhesion loss. The mechanical and electrical properties of polyimide may be altered as a result of the interaction with metals and therefore, great care is necessary to insure a stable interface and the reliability of devices.

scholarly journals Bio-Based Hotmelt Adhesives with Well-Adhesion in Water

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 666
Author(s):  
Xi Yu ◽  
Chuang Dong ◽  
Wei Zhuang ◽  
Dongjian Shi ◽  
Weifu Dong ◽  
...  
Keyword(s):  
Adhesion Strength ◽  
One Pot ◽  
Adhesion Properties ◽  
Wet Adhesion ◽  
Initial Strength ◽  
Term Stability ◽  
Long Term Stability ◽  
Low Viscosity ◽  
A Value

We suggest a simple idea of bio-based adhesives with strong adhesion even under water. The adhesives simply prepared via polycondensation of 3,4-dihydroxyhydrocinnamic acid (DHHCA) and lactic acid (LA) in one pot polymerization. Poly(DHHCA-co-LA) has a hyperbranched structure and demonstrated strong dry and wet adhesion strength on diverse material surfaces. We found that their adhesion strength depended on the concentration of DHHCA. Poly(DHHCA-co-LA) with the lowest concentration of DHHCA showed the highest adhesion strength in water with a value of 2.7 MPa between glasses, while with the highest concentration of DHHCA it exhibited the highest dry adhesion strength with a value of 3.5 MPa, which was comparable to commercial instant super glue. Compared to underwater glues reported previously, our adhesives were able to spread rapidly under water with a low viscosity and worked strongly. Poly(DHHCA-co-LA) also showed long-term stability and kept wet adhesion strength of 2.2 MPa after steeping in water for 1 month at room temperature (initial strength was 2.4 MPa). In this paper, Poly(DHHCA-co-LA) with strong dry and wet adhesion properties and long-term stability was demonstrated for various kinds of applications, especially for wet conditions.

Healing defective CVD-graphene through vapor phase treatment

Nanoscale ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 5639-5644 ◽  
Author(s):  
Do Van Lam ◽  
Sang-Min Kim ◽  
Youngji Cho ◽  
Jae-Hyun Kim ◽  
Hak-Joo Lee ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Vapor Phase ◽  
Transfer Process ◽  
Growth Stage ◽  
Structural Defects ◽  
Cvd Graphene ◽  
Term Stability ◽  
Long Term Stability

Structural defects present on CVD-graphene, which originated from the growth stage and transfer process, can be selectively healed by vapor phase treatment. The treated graphenes show noticeably improved electrical properties with long term stability in contrast with chemically doped graphenes.

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