I’m trying to etch some copper to be a circuit. The etchant is sodium persulfate
, Na2S2O8. It’s diluted 25% into water.
For the resist, I want to use 3d printed flexible filament, NinjaFlex, which is a thermoplastic polyurethane.
However, I’m not getting very far on figuring out what the possible interactions would be with this material and Na2S2O8 (aq), CuSO4 (aq), Na2SO4 (aq).
What I tried so far was to ask the maker of the filament what would happen. Since sodium persulfate is a strong oxidizer, they do not recommend it. (But they didn't explain why)
I tried searching for answers and clues, but I’m probably not searching for the right topic.
From my imagination, I think that this experiment could turn out poorly if the thermoplastic polyrethane (after it reacts with the products) becomes oxidised to a harmful compound, or if it’s an exothermic reaction and releases a harmful gas. I think the gas scenario would be unlikely since I’m not adding heat to the reaction- it’s about 18 deg C. It would take more energy...
But I don’t really know. Do you have any ideas???
How would one figure out how this organic chemical reacts with these chemicals?
Thanks for taking the time to read my weird question and any help you can lend!