Permeation properties to hydrocarbons, perfluorocarbons and chlorofluorocarbons of cross-linked membranes of polymethacrylates with poly(ethylene oxide) and perfluorononyl moieties

Two kinds of cross-linked polymer membranes were prepared by photo polymeri zation. One of them (PEO membrane) is a co-polymer of methoxy-terminated po ly(ethylene glycol) methacrylate (MEMA) and poly(ethylene glycol) dimethacr ylate (EDMA) in feed ratio of 70/30 in wt %. The other (PF/PEO membrane) is a co-polymer of 1H,1H,9H-hexadecafluorononyl methacrylate and EDMA in feed ratio of 70/30 in wt%. The block lengths of poly(ethylene oxide) (PEO) are 9 and 14 for MEMA and EDMA, respectively. Permeation properties of inorgan ic gases, hydrocarbons, perfluorocarbons and chlorofluorocarbons (CFCs) wer e investigated for these membranes compared with a silicone rubber (SR) mem brane. The PF/PEO membrane is inferior to the SR membrane as for CFCs/N-2 s eparation because the former has lower permeabilities. The PEO membrane has good performance for separation of hydrocarbons and CFCs from N-2 or perfl uorocarbons. (C) 1999 Elsevier Science B.V. All rights reserved.