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- W2350542227 abstract "Novel crosslinkable 6FDA copolyimides containing strong polar carboxylic acid groups(i.e.6FDA-TMPDA/DABA)were synthesized.In the polymerization reaction 6FDA(4,4'-(hexafluoroisopropylidene)-diphthalic anhydride)was used as dianhydride monomer,TMPDA(2,4,6-trimethyl-1,3-phenylenediamine)and DABA(3,5-diamino benzoic acid)were used as diamine monomers.Viscosities,glass transition temperatures( T g),thermal decomposition temperatures( T d) of copolyimides were determined from the data with a Ubbelohde viscosimeter,a differential scanning calorimetry,a thermogravimetric analysis.Copolyimides exhibited good thermal properties,they showed no T g when temperatures rised about 400 ℃ T d were more than 520 ℃.Membranes of copolyimides 6FDA-TMPDA/DABA 9∶1 and 3∶1 were prepared.The permeabilities of two membranes for CO 2 and N 2 pure gases were determined at 30 ℃ and 101 325 Pa.Two membranes exhibited higher permeability and ideal selectivity for CO 2/N 2.The permeability of membrane 6FDA-TMPDA/DABA 9∶1 was 1.125×10 -13 m 3·m/(m 2·s·Pa)." @default.
- W2350542227 created "2016-06-24" @default.
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- W2350542227 date "2002-01-01" @default.
- W2350542227 modified "2023-09-23" @default.
- W2350542227 title "Synthesis and gas properties of 6FDA copolyimides(6FDA-TMPDA/DABA)" @default.
- W2350542227 hasPublicationYear "2002" @default.
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