PHB, P(HB-co-9% HV) and P(HB-co-22% HV) membranes for microfiltration or pervaporation - Filtration properties and surface state

Microfiltration porous membranes (J(H2O) = 15,800 1/m(2) . atm . j, r(p) = 0,25 mu m) and pervaporation dense membranes for ethanol deshydratation (J(total) = 0,008 kg/j . m(2), alpha = 12,6) were prepared from polyhydroxybutyrate, poly(hydroxybutyrate-co-hydroxyvalerate) with 9% and 22% valerate contents. Different surface structures characterized with contact angle, surface energy and scanning electronic microscopy were correlated with filtration properties. Membranes were prepared after immersion coagulation or total evaporation from different ternary system P-S-NS compositions.