I have heard that O2 plasma helps metal adhesion with PDMS.
The following reference may also be useful:

"Design and fabrication of elastic interconnections for stretchable
electronic circuits", Brosteaux, D; Axisa, F; Gonzalez, M, et al., IEEE
ELECTRON DEVICE LETTERS Vol. 28, Iss. 7, P. 552-554, JUL 2007.

Gareth

On Thu, Jan 7, 2010 at 00:10, Jimmy Wang  wrote:
>
> Hi,
>
> I am working on a project that involves embedding metals (copper/zinc)
into
> PDMS. The purpose is to have it be flexible. However, despite being
> flexible, due to the weak adhesion between PDMS and the embedded metal,
the
> PDMS may just peel off. The metal is cleaned very thoroughly yet the
problem
> still occurs. It appears that metal does not adhere well to PDMS. Is there
> anything to enhance the adhesion between PDMS and metal?
>
> Thanks!
>
> JJW