Surface functionalization of a poly(butylene terephthalate) (PBT) melt-blown filtration membrane by wet chemistry and photo-grafting.

The surface functionalization of PBT melt-blown membrane, making up a whole filter of blood components, was achieved via two methods. Hydroxyl chain-end activation by tosylation (method A), followed by coupling of F- and (3)H-tagged molecules (probes), led to 1% of surface derivatization (XPS) and 290 pmol/cm(2) of lysine fixation (LSC). Deposition of O-succinimidyl 4-(p-azido-phenyl)butanoate ("molecular clip") and 2 h irradiation at 254 nm led to the implanting of activated ester functions, randomly on the polymer surface (method B).