Synthesis of Polysiloxane-Imide Membranes -Application to the Extraction of Organics From Water Mixtures
The synthesis of new copolysiloxane-imide polymers was carried out from a, w-dimethylsiloxane oligomers and aromatic di-anhydrides (PMDA and 6FDA) to obtain soluble siloxane-imide based polymers (PSI) endowed both with organophile properties and good physical membrane properties. Synthesized PSI block copolymers had high weight contents of siloxane residue varying from 70 to 94 wt.%; their pervaporation properties were studied towards ethanol water feed mixtures (EtOH:10 and 50wt.%) at 40?C. The two block copolymer series ? fluorinated and not fluorinated were both highly selective for ethanol removal from water. The registered pervaporation properties demonstrated.