2024-03-28T22:56:24Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/218952021-06-23T10:14:48Zcom_10324_1157com_10324_931com_10324_894col_10324_1298
Tena Matías, Alberto
Viuda, Mónica de la
Palacio Martínez, Laura
Prádanos del Pico, Pedro Lourdes
Marcos Fernández, Ángel
Lozano, Ángel E.
Hernández Giménez, Antonio
2014
Producción Científica
A complete series of aliphatic aromatic copoly(ether-imide)s, based on aromatic dianhydrides (BPDA,
BKDA or PMDA) and mixtures of an aromatic diamine (ODA) and an aliphatic diamine terminated
poly(ethylene oxide) PEO(2000) (Mw=2000 g/mol) or PEO(6000) (Mw= 6000 g/mol), has been
synthesized using different PEO contents. Cast films of these copolymers have been thermally treated to
ensure the segregation of the linear PEO chains from the aromatic portion of these copoly(ether-imide)s.
Gas permeability (O2, N2, CO2 and CH4) of membranes, made from these copolymers with different
proportions of PEO, were compared with the predictions of various electrical or thermal conductivity
models adapted to gas permeability. Several of these models, from Maxwell-Garnett to percolation
theory, proved to be inaccurate. Nevertheless, the model based on the Effective Medium Approximation
(EMA) is proved here to succeed in predicting the main features of the experimental results for all
mixture proportions, taking as the starting point the sole input of pure homopolymer permeabilities.
Specifically, this later method was able to calculate the volume fraction for the maximum increase of
permeability, a common feature for all the studied segregated copolymer membranes. The model was
even able to predict the permeabilities of a three phase system consisting in the aromatic (BKDA-ODA)
phase plus a mixture of amorphous PEO(6000) and crystalline PEO(6000).
application/pdf
http://uvadoc.uva.es/handle/10324/21895
eng
Elsevier
Copoly(ether-imide) membrane
Phase segregation
Thermal treatment
Gas separation
Effective Medium Approximation
Percolation
Prediction of gas permeability of block-segregated polymeric membranes by an effective medium model
info:eu-repo/semantics/article
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