Why do some researchers use Polyimide as the substrate for thin metal film when analyzing the mechanical properties of the film with tensile test?

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Jan Isaac Lubrica Bugante

Hello Hai,

Since polyimide is a polymer, you can bend or stretch it. Now, if you use it as a substrate for thin metal films, it would be much easier to study its mechanical properties.

Hai Tran

Thank you, Jan. But why Polyimide? there are a lot of different polymers.

Well, I guess this is due to the property of polyimide. Just to name a few, it can withstand high temperatures (probably a good thing during deposition process), it's surface is relatively smooth (good for thin films), and is resistant to acids and other solvents.

Junaid Ali

It can sustain temperatures beyond 300C without going through deformation within its structure due to elevated temperatures, Compare with flexible substrates mostly used for flexible electronics, eg PET temperatures beyond 100 are doubtful for its structure and may degrade devices on it.

Thank you Jan and Junaid. It is much clearer now.