RT info:eu-repo/semantics/article
T1 Aromatic polyimide membranes with tert-butyl and carboxylic side groups for gas separation applications—covalent crosslinking study
A1 Esteban Hernández, Isabel Noelia
A1 Juan y Seva Martínez, Marta
A1 Aguilar Lugo, Carla
A1 Miguel García, Jesús Ángel
A1 Staudt, Claudia
A1 Campa, José G. de la
A1 Álvarez, Cristina
A1 Lozano, Ángel E.
K1 Polymers
K1 Polímeros y polimerización
K1 Polyimides
K1 Strength of materials
K1 Resistencia de los materiales
K1 Gases - Separation
K1 Plasticization resistance
AB A set of aromatic copolyimides was obtained by reaction of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), and mixtures of the diamines 1,4-bis(4-amino-2-trifluoromethylphenoxy)-2,5-di-tert-butylbenzene (CF3TBAPB) and 3,5-diamino benzoic acid (DABA). These polymers were characterized and compared with the homopolymer derived from 6FDA and CF3TBAPB. All copolyimides showed high molecular weight values and good mechanical properties. The presence of carboxylic groups in these copolymers allowed their chemical crosslinking by reaction with 1,4-butanediol. Glass transition temperatures (Tg) were higher than 260 °C, showing the non-crosslinked copolyimides had the highest Tg values. Degradation temperature of crosslinked copolyimides was lower than their corresponding non-crosslinked ones. Mechanical properties of all polymers were good, and thus, copolyimide (precursor, and crosslinked ones) films could be tested as gas separation membranes. It was observed that CO2 permeability values were around 100 barrer. Finally, the plasticization resistance of the crosslinked material having a large number of carboxylic groups was excellent.
PB MDPI
SN 2073-4360
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/59310
UL https://uvadoc.uva.es/handle/10324/59310
LA eng
NO Polymers, 2022, Vol. 14, Nº. 24, 5517
NO Producción Científica
DS UVaDOC
RD 27-jul-2024