RT info:eu-repo/semantics/article
T1 Isomeric aromatic polyimides containing biphenyl moieties for gas separation applications
A1 Matesanz Niño, Laura
A1 Cuellas, David
A1 Aguilar Lugo, Carla
A1 Palacio Martínez, Laura
A1 González Ortega, Alfonso
A1 Campa, José G. de la
A1 Álvarez, Cristina
A1 Lozano, Ángel E.
K1 Polyimides
K1 Polymers
K1 Polymerization
K1 Polimeros y polimerización
K1 Thermal resistance
K1 Gas separation
K1 Gases - Separation
K1 Chemistry
K1 2206.10 Polímeros
K1 2204.05 Gases
K1 23 Química
AB An optimized synthesis of the monomer 2,2′3,3′-biphenyltetracarboxylic dianhydride, iBPDA, was performed to obtain high molecular weight polymers. This monomer has a contorted structure that produces a non-linear shape, hindering the packing of the polymer chain. Aromatic polyimides of high molecular weight were obtained by reaction with the commercial diamine 2,2-bis(4-aminophenyl) hexafluoropropane, 6FpDA, which is a very common monomer in gas separation applications. This diamine has hexafluoroisopropylidine groups which introduce rigidity in the chains, hindering efficient packing. The thermal treatment of the polymers processed as dense membranes had two targets: on the one hand, to achieve the complete elimination of the solvent used, which could remain occluded in the polymeric matrix, and on the other hand to ensure the complete cycloimidization of the polymer. A thermal treatment exceeding the glass transition temperature was performed to ensure the maximum degree of imidization at 350 °C. The good mechanical properties of these materials allow for their use in high-pressure gas purification applications. Moreover, models of the polymers exhibited an Arrhenius-like behavior characteristic of secondary relaxations, normally associated with local motions of the molecular chain. The gas productivity of these membranes was high.
PB MDPI
SN 2073-4360
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/63710
UL https://uvadoc.uva.es/handle/10324/63710
LA eng
NO Polymers, 2023, Vol. 15, Nº. 6, 1333
NO Producción Científica
DS UVaDOC
RD 14-may-2024