Hi Sheng,
    I would suggest a couple of things:
  1.  Plasma clean the glass just before putting on the polyimide
  2. Use adhesion promoter, e.g. VM-651, freshly prepared
That said polyimide readily absorbs water which causes it to swell thus
creating stress and has a much higher conductivity to ions than to
electrons (like 5 orders of magnitude). So beware electrical applications
of polyimide where it will be in ionic solutions for extended periods.

Cheers,
  Michael


On Fri, Jan 18, 2013 at 7:10 PM, Yunda Wang  wrote:

> Did you use adhesive promoter？For example, VM-652?
>
> 2012/11/19 Sheng Zhang 
>
> > brine
>
>
>
>
>
> --
> Yunda Wang, Ph.D.
> Department of Mechanical engineering
> University of Colorado - Boulder
> Boulder,Co. US. 80302
> (614)3120920
> E-mail: yundawang@gmail.com
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_______________________________________________
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