Ideal low-protein binding membranes
Apparently poly(ethylene oxide) is a biologically interesting polymer, with minimal protein interactions.

The apparently means that I haven't tried it myself, but my polymer teacher told us so.

http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=20204110

http://en.wikipedia.org/wiki/Polyethylene_glycol

Nomenclature seems to favour poly(ethylene glycol). I prefer poly(ethylene oxide), because then I know from what monomer the polymer was synthesized.