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- W2023010000 abstract "Diphenylacetylenes possessing fluorine atom(s) and a siloxy group (1c−i) were polymerized with TaCl5−n-Bu4Sn. Monomers 1c−f having a siloxy group at the para position of a phenyl ring produced high molecular weight polymers (2c−f) in good yields. These polymers afforded tough free-standing membranes by casting their toluene solution. Desilylation of the polymer membranes was carried out with trifluoroacetic acid to give membranes of poly(diphenylacetylenes) having fluorine atoms and hydroxyl groups (3c−f). Polymers 2c−f were soluble in various organic solvents such as toluene, CHCl3, and THF, while polymers 3c−f were insoluble in these solvents. All the polymers 2c−f and 3c−f exhibited high thermal stability. The gas permeability of most membranes in the present study (2d−f and 3c−f) were higher than those of the corresponding polymers without fluorine atoms (2a and 3a), indicating that incorporation of fluorine atoms into the polymers enhances gas permeability. The PCO2/PN2 permselectivity ratios of polymers 3c−f were as large as 36−48, and the points of 3c−f in the PCO2 vs PCO2/PN2 plot were located above Robeson's upper bound." @default.
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- W2023010000 date "2005-12-21" @default.
- W2023010000 modified "2023-10-14" @default.
- W2023010000 title "Synthesis and Properties of Membranes of Poly(diphenylacetylenes) Having Fluorines and Hydroxyl Groups" @default.
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- W2023010000 doi "https://doi.org/10.1021/ma052082n" @default.
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