RT info:eu-repo/semantics/article
T1 Polymeric films based on blends of 6FDA-6FpDA polyimide plus several copolyfluorenes for CO2 separation
A1 Tena Matias, Alberto
A1 Vazquez Guilló, Rebeca
A1 Marcos Fernández, Ángel
A1 Hernández Giménez, Antonio
A1 Mallavia, R.
K1 Conjugated blend membrane
K1 Gas separation
K1 Fluorescence
K1 Carbon dioxide
K1 Copolyfluorene
K1 Polyimide
AB Three emitting copolyfluorenes, based on 2,7-(9,9-dihexyl)fluorene and different arylgroups (1,4-bencene, PFH-B; 1,4-bencen-1,2,5-thiadiazole PFH-BT; 1,4-naphthalen-1,2,5-thiadiazole, PFH-NT), showing diverse acceptor character, in differentproportions were blended with a polyimide 6FDA-6FpDA to make a series of films.These copolyfluorene-polyimide blends were prepared and characterized in solid state,using several techniques. The fluorescence of conjugated polymers can be used as a toolto understand the formation of the membrane and also to increase permeability andselectivity in comparison to films without fluorescence. The relationship between theintrinsic fluorescence of conjugated polyfluorenes and their gas separation propertieshas been explored in order to establish the influence of the composition and the natureof the aryl group, in the conjugated polymer, on the gas separation performances. In allcases, a low proportion of copolyfluorenes (< 1%weight) gives better CO2/CH4permselectivity properties than the original pure polyimide matrix. The best results werefound for the samples that contain PFH-NT. This sample gives 25 % increase in theCO2 permeability with 15 % increase in CO2/CH4 selectivity. Finally, the loss ofefficiency in conjugation mechanisms of absorption and emission of the samples couldbe explained on the basis of the π-staking of the polymer chains produced when acertain low percentage of conjugated polymers in the blend is surpassed. When this π-staking starts, gas permeation properties start to decline too.
PB Royal Society of Chemistry
YR 2015
FD 2015
LK http://uvadoc.uva.es/handle/10324/21907
UL http://uvadoc.uva.es/handle/10324/21907
LA eng
NO RSC Advances. 2015,5, p. 41497-41505
NO Producción Científica
DS UVaDOC
RD 24-nov-2024