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Título
Polymeric films based on blends of 6FDA-6FpDA polyimide plus several copolyfluorenes for CO2 separation
Autor
Año del Documento
2015
Editorial
Royal Society of Chemistry
Descripción
Producción Científica
Documento Fuente
RSC Advances. 2015,5, p. 41497-41505
Zusammenfassung
Three emitting copolyfluorenes, based on 2,7-(9,9-dihexyl)fluorene and different aryl
groups (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 different
proportions 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 tool
to understand the formation of the membrane and also to increase permeability and
selectivity in comparison to films without fluorescence. The relationship between the
intrinsic fluorescence of conjugated polyfluorenes and their gas separation properties
has been explored in order to establish the influence of the composition and the nature
of the aryl group, in the conjugated polymer, on the gas separation performances. In all
cases, a low proportion of copolyfluorenes (< 1%weight) gives better CO2/CH4
permselectivity properties than the original pure polyimide matrix. The best results were
found for the samples that contain PFH-NT. This sample gives 25 % increase in the
CO2 permeability with 15 % increase in CO2/CH4 selectivity. Finally, the loss of
efficiency in conjugation mechanisms of absorption and emission of the samples could
be explained on the basis of the π-staking of the polymer chains produced when a
certain low percentage of conjugated polymers in the blend is surpassed. When this π-
staking starts, gas permeation properties start to decline too.
Materias (normalizadas)
Conjugated blend membrane
Gas separation
Fluorescence
Carbon dioxide
Copolyfluorene
Polyimide
Revisión por pares
SI
Patrocinador
Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA302U13)
Version del Editor
Idioma
eng
Derechos
openAccess
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