Use PMDA (anhydride) + MDI (isocyanate) + NMP (solvent) as the precursor. When CO2 is not produced, add PEG 200 (polyol) as a chain extender. After drying in the oven, the film will break in the oven!
Curing before drying, slow and low-temperature drying, and perhaps high viscosity solvent can do your job!
You may need to check the oxidative and other plausible chemical reactivity possibilities too!
Thank you for your reply!
Lowering the drying temperature is a good suggestion.
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