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Anyone involved with imprinting polymers? Is there anyone who may be using imprinted polymers in facilitated diffusion?

I'm trying to make small 3.5 radii membranes from polyurethane pellets dissolved in THF(10%polymer solution). I'm casting them in aluminum pans and tried both air-drying in a hood and vacuum drying, but when I try to peel the membranes off...they cohere to themselves and won't unstick...kinda...

I'm looking for a material that is permeable to water vapor but impermeable to larger gas molecules (50-150 m.w.) and potentially impermeable to toxic/hazarodous fumes/gases.

any plastics that are permeable to water vapor but impermeable to larger gas molecules (50-150 m.w.)??

any polymeric sheets that are selectively permeable to water but not to larger (50-150 m.w.) gas molecules?

Are there any elastomeric sheets that are selectively permeable to water vapor but impermeable to larger (50-150 molecular weight) gas molecules?

Are there any coatings that will remain flexible after application and serve as a gas barrier except to water vapor and other harmless gases?

I am searching for POTENTIAL membranes (flexible and thin) that are water vapor permeable and may be barriers to low molecular weight toxic/hazardous fumes/gases. Anyone know where to look?