I'm trying to build a millimeter pattern on the photopolymer resin to use it as a mold for PDMS. But it's hard to peel the PDMS off from the molds. If you have any suggestions that might be helpful, please let me know.
Hi Sheikh
A common solution is to passivate the mold surface with a fluoro silane using vapor deposition.
Here are some papers that include the silane vapor deposition technique
researchmicrostamps.com/resources
Andrew H. Cannon, Ph.D.
Hi Sheikh,
Where does your photopolymer reside? If you've printed your master on glass/silicon, then if you don't surface treat your substrate, the PDMS wouldn't come off. You can use TMCS or a mild detergent like Alconox to ease the peeling procedure while molding from glass or silicon.
I actually was expecting the photoresin to come off with PDMS when peeled. I am not sure how you print your master but in most cases, we have a problem with the poor adhesion of the photoresin to the substrate. In my case, you just add water and poof! they start floating around.
Could anyone suggest a way to prevent lift-off of the 3D printed resin off of the silicon wafer while peeling PDMS after curing? We are unable to control this issue despite silanizing the silicon wafer prior to 3D printing. Thanks in advance for your suggestions!
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