RT info:eu-repo/semantics/article
T1 Prediction of gas permeability of block-segregated polymeric membranes by an effective medium model
A1 Tena Matias, Alberto
A1 Viuda, Mónica de la
A1 Palacio Martínez, Laura
A1 Prádanos del Pico, Pedro Lourdes
A1 Marcos Fernández, Ángel
A1 Lozano, Ángel E.
A1 Hernández Giménez, Antonio
K1 Copoly(ether-imide) membrane
K1 Phase segregation
K1 Thermal treatment
K1 Gas separation
K1 Effective Medium Approximation
K1 Percolation
AB 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 terminatedpoly(ethylene oxide) PEO(2000) (Mw=2000 g/mol) or PEO(6000) (Mw= 6000 g/mol), has beensynthesized using different PEO contents. Cast films of these copolymers have been thermally treated toensure 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 differentproportions of PEO, were compared with the predictions of various electrical or thermal conductivitymodels adapted to gas permeability. Several of these models, from Maxwell-Garnett to percolationtheory, 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 allmixture 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 ofpermeability, a common feature for all the studied segregated copolymer membranes. The model waseven 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).
PB Elsevier
SN 0376-7388
YR 2014
FD 2014
LK http://uvadoc.uva.es/handle/10324/21895
UL http://uvadoc.uva.es/handle/10324/21895
LA eng
NO Journal of Membrane Science, 2014,vol.  453, p. 27–35
NO Producción Científica
DS UVaDOC
RD 22-nov-2024