I have spincoated a 800nm PVOH coating on a substrate. Polyvinylalcohol 88% hydrolysis grade. PVOH in a watery solution.
The quality of my coating is not good enough: adhesion-type problems.
When I heat my PVOH coating to 120'C for 15 min in a convection oven, quality is good.
Q: What happens physically - I know it is not the water/solvent from the layer has been tested with vacuum-oven tests.
Q:Why can this effect not be reached at lower temperatures? Or any other way, additives, or even other type of polymer? Suggestions welcome.
All the best, Thanks, Roge.