Hello,
I am spin coating PDMS onto porous LDPE. However, when I test the permeability to air, it shows a low permeance rate. My method is as follows:
-Dissolve Sylgard base and curing agent in toluene as 20 wt.% solution
-degass solution
- spin coat onto porous LDPE for 2 mins at 1500 rpm
- let it cure at room temp for 48 hr
- put in vac oven at 80 degrees for 2 hrs to complete crosslinking and evaporate remaining toluene
Any help is appreciated!