2005
DOI: 10.1021/ma051662h
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Effect of Hexafluoro-2-propanol Substituents in Polymers on Gas Permeability and Fractional Free Volume

Abstract: A series of polymers were synthesized containing hexafluoro-2-propanol (HFP) pendant groups by facile reaction of lithiated polymers with hexafluoroacetone (HFA). The purpose of the study was to evaluate the effect of the HFP group in potential membrane gas separation materials. Dibromobisphenol A polysulfone (PSf-Br2), tetramethylbisphenol A polysulfone (TMPSf), dibromohexafluorobisphenol A polysulfone (6FPSf-Br2), tetramethylhexafluorobisphenol A polysulfone (TM6FPSf), and poly(2,6-dimethyl-1,4-phenylene oxi… Show more

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Cited by 24 publications
(22 citation statements)
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“…different alkyl groups, different copolymer ratios, and UV-crosslinking), which is centered at 4.5 Å, is identical due to the high rigidity of double stranded siloxane structure [16,17,24,32]. In general, the inter-chain distance correlates with polymer chain packing, and polymers containing bulky side groups with large inter-chain distance show a low polymer chain packing density or high fractional free volume (FFV) [34][35][36]. The physical properties of LPSQs are listed in Table 1.…”
Section: Mixed Gasmentioning
confidence: 99%
See 1 more Smart Citation
“…different alkyl groups, different copolymer ratios, and UV-crosslinking), which is centered at 4.5 Å, is identical due to the high rigidity of double stranded siloxane structure [16,17,24,32]. In general, the inter-chain distance correlates with polymer chain packing, and polymers containing bulky side groups with large inter-chain distance show a low polymer chain packing density or high fractional free volume (FFV) [34][35][36]. The physical properties of LPSQs are listed in Table 1.…”
Section: Mixed Gasmentioning
confidence: 99%
“…This is due to the quite large interchain distance of the LPSQ membranes. Whereas conventional polymers show an interchain distance ranging from 4 to 7 Å [6,34,55], the inter-chain distance of LPSQ membranes is ca. 1.3 nm, which is within the transition region between solutiondiffusion and Knudsen diffusion-controlled regions [46].…”
Section: The Effect Of Different R Groupsmentioning
confidence: 99%
“…Examples of the functionalization chemistry include sulfonation, 3 bromination, 4 chloromethylation, 5 amidoalkylation, 6 and lithiation. 7−9 Functionalized PSfs have been actively investigated as membrane materials for gas 1,2,10,11 and liquid separation 12 and for fuel cells (FCs). 13−16 For example, sulfonated polysulfones, which have been synthesized by copolymerization with a sulfonated comonomer or by postsulfonation, 13,16 have been widely studied for proton exchange membranes (PEMs) for acidic fuel cells to provide alternatives to established Nafion that has dominated the field.…”
Section: ■ Introductionmentioning
confidence: 99%
“…Bromine in polymers may also be converted readily into various functional groups, such as trimethylsilyl, phosphonate, and many others. [6,7] Bromine-containing polymers are often prepared either by post-bromination or by the polymerization of brominated monomers. [8] Compared with sulfonic acid units, phosphonic acid units are known for their higher chemical and thermal stability and greater ability to retain water.…”
Section: Introductionmentioning
confidence: 99%