Never tried that. But please be noted that the effective time for the cured
surface is just a couple of seconds. See if it is working----you cure piece
A, and pour the liquid PDMS on this piece immediately when it is picked out
of the plasma chamber. Air dry 1 hour, and then bake with a bit higher
temperature, say 110C.

Good luck,

Hongjun Zeng, PhD
Microfabrication Application Laboratory(MAL)
University of Illinois at Chicago


-----Original Message-----
From:  [email protected]
Subject: [mems-talk] PDMS question

I wondering if anyone has had experience with bonding PDMS to PDMS. I don't
mean bonding two cured slabs using oxygen plasma. I want to take one slab
that is already cured, and then pour new liquid PDMS on top of it in order
to encapsulate some stuff that I put on the slab.

I tried taking a piece of cured PDMS and pouring new PDMS on top of it
without involving anything to be encapsulated, just so I could see how the
adhesion was, and it turned out to be terrible.

If anyone has any suggestions on getting liquid PDMS to bond to cured PDMS,