Varun,

1) According to Sylgard 184 product datasheet, 4 hours at 65C or 1 hour at
100C are recommanded curing condition.

2) I have measure the advacing contact angle of O2 plasma treated PDMS
surface. No significantly change of the angle happened within 4 hours.

If your PDMS have not been cured well, more unbonded chains will recover the
hydrophilic surface to hydrophbic surface. This might give you problem for
strong bonding.

Good luck!

Lydia


Quoting varun reddy :

> Hi,
> I need to bond PDMS to glass, and i have been having problems with this. I
> have
> features on the cured PDMS that have to be aligned under the microscope to
> patterned electrodes (Au/Cr) on a glass slide.
>
> Since i need to align the pattern on the cured PDMS to the electrodes, i have
> a
> delay of about 2-5 minutes after i have treated both the surfaces with an O2
> plasma.
>
> I have had better luck when i bond the PDMS with the glass slide immediately
> after plasma treatment of the two surfaces without allignment.
>
> Can anyone suggest a procedure that i can use to obtain fairly good bonding
> even
> with the 2-5 min delay after treating the surfaces with an O2 plasma.
>
>
> PDMS curing recipie -
> 10:1 (sylgard 184 elastomer base: sylgard 184 curing agent)
> cure the PDMS for 1 hr at 60oC in an oven.
>
>
>
> Thanks,
>
> Varun Reddy
>
>
>
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