I have a PVA+PVP microstructure attached to a thin film of PMMA. I'm trying to dissolve just the PMMA film while retaining the microstructure by submerging it in acetone. However, during the process the microstructure was observed to dissolve as well. I thought that the PVA/PVP mixture was insoluble in acetone but that doesn't seem to be the case. Might it be because of the molecular weight of PVP that I'm using (Mw of 10,000)? Thank you