I'm going to use photolithography to make a mold for PDMS casting. However, because of the high aspect ratio of the features, peeling the PDMS off is not easy. So I'm looking for a water-soluble resist so that the mold can be dissolved by submerging in water rather than a need for peeling off the PDMS.
Rassoul Tabassian Have you tried silanization of the mold before doing the PDMS process? A drop of Trichloro(1H,1H,2H,2H-perfluorooctyl)silane (from Sigma Aldrich) on the mold and then heating up the mold at 200 degrees on a hot plate for 1 hour with a lid on top (a glass petri dish would do)will help.
I do not know of any suitable water soluble photoresists, but an alternate would be to use water soluble 3D printed molds like this paper:
3D printed water-soluble scafolds for rapid production of PDMS micro-fuidic fow chambers
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