The Polyimide film is cured on a polished substrate In general Polyimides have a very low adhesion to any material. But in case if the film is rather large - to remove it becomes difficult.
It may be worth trying to alter the curing parameters as that would potentially affects the polyimide/steel adhesion.
Dear all;
if you apply a PTFE based coating on the still belt to promote the anti-adhesion may be the problem will be solved. Regards
Dear Dr. Leonid V Vladimirov,
well, frankly speaking I can not tell about the cost of such an operation, but I think it will be nothing for an industrial production. Some kitchen metal stuff are coated with PTFE based film as you know. Regards
Dear prof. Abdelkader BOUAZIZ :
Excuse me please or the belated answer.
The problem still is not successfully solved.
You are right PTFE or similar Fluorine-containing polymers - will promote anti-adhesion and facilitate the removal of the PI film from the belt.
BUT there are to obstacles - which prevent us of using this solution.
Namely: the anti-adhesive coating - usually works OK for 10-20 syntheses because if you compare the ATR spectra of the Air-side and Belt-side of the thus obtained PI film - you will see PTFE on the belt side.
There are two important consequences from the above-said:
1. Because of "PTFE - islands" on the belt-side - the adhesion to this side of PI film will drop down and
2. as I already said - from time to time we will have to refresh the PTFE-like anti-adhesive coating -- which is a time consuming and coctly operation.
Thank you very much for your advice. We'd greatly appreciate any new ideas from your side of how to solve our problem.
Sincerely yours,
Leonid Vladimirov
2 years ago
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