How do you test the bonding strength for PDMS bonded to silicon/glass? Which method and which tools do you use? Which is the resolution of your method?
Basically you insert a razor blade into the bonding interface (not sure if this is feasible with PDMS - if the PDMS is too soft you'll just cut it). The razor blade causes the two films (eg. wafer & PDMS film) to separate. In front of the razor blade, there will be some distance that has delaminated - the delaminated distance in front of the razor blade can tell you the bond strength.
See this surprisingly useful wikipedia page on the technique:
Thank you very much for your answer. By the way I am pretty sure that a razor blade would cut the PDMS. But the other methods described in the link you sent me seem promising. Thank you!!