RT info:eu-repo/semantics/article
T1 Phase Segregation and Gas Separation Properties of Thermally Treated Copoly(ether-imide) from an Aromatic Dianhydride, an Aromatic Diamine, and Various Aliphatic Diamines
A1 Tena Matias, Alberto
A1 Marcos-Fernandez, Angel
A1 Palacio Martínez, Laura
A1 Cuadrado Curto, María Purificación
A1 Prádanos del Pico, Pedro Lourdes
A1 de Abajo, Javier
A1 Lozano, Angel E.
A1 Hernández Giménez, Antonio
AB Copoly(ether-imide)s formed by the reaction of an aromatic dianhydride (BPDA), an aromatic diamine (ODA), and various aliphatic diamines (PEO-2000, PPO-2000, RT-1000, pTHF-1700, and pTHF-350) have been obtained. These copolymers underwent phase segregation processes, as confirmed by small-angle X-ray scattering (SAXS), when they were thermally treated. Gas permeabilities of these materials depended on the phase separation. Thus, a linear relationship between gas permeability and increasing percentage and size of the domains of the segregated phase has been obtained. The differences in the degree of segregation have been examined for the different aliphatic diamines used in the synthesis of the copolymers. The effect of polarity, length, and structure of the chain were examined in terms of permeability for the gases O2, N2, CO2, and CH4. It has been shown that long aliphatic chains with adequate polarity and the ability to interact with and enhance the condensation of a certain gas give better materials. Improved selectivities, approaching the Robeson limit, were seen as a consequence of the thermal treatment. Also, an interesting reverse selectivity has been observed for the mixture CH4/N2, probably due to a combined effect of a specific interaction and an increase in solubility of CH4 in the soft segregated portions of the copolymer.
PB ACS Publications
YR 2012
FD 2012
LK https://uvadoc.uva.es/handle/10324/72771
UL https://uvadoc.uva.es/handle/10324/72771
LA spa
NO Ind. Eng. Chem. Res. 2012, 51, 9, 3766–3775
DS UVaDOC
RD 20-may-2025