Gas separation membranes obtained by partial pyrolysis of polyimides exhibiting polyethylene oxide moieties

Aromatic copolyimides (PIx) and aromatic-aliphatic copolyimides (PIxEOy) were synthesized by reacting 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with mixtures obtained from 2,2′-bis(4-aminophenyl)hexafluoropropane (6FpDA), 5-diaminobenzoic acid (DABA) and Jeffamine ED-2003 (PEO). Th...

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Bibliographic Details
Published in:Polymer (Guilford) 2022-04, Vol.247, p.124789, Article 124789
Main Authors: Matesanz-Niño, Laura, Aguilar-Lugo, Carla, Prádanos, Pedro, Hernandez, Antonio, Bartolomé, Camino, de la Campa, José G., Palacio, Laura, González-Ortega, Alfonso, Galizia, Michele, Álvarez, Cristina, Lozano, Ángel E.
Format: Article
Language:English
Subjects:
Carbon dioxide
Crosslinking
Ethylene oxide
Gas separation
High resistance
Mechanical properties
Membrane permeability
Membranes
Methane
Polyethylene
Polyethylene oxide
Polyimide resins
Polyimides
Polymer blends
Polymers
Pyrolysis
Selectivity
Thermal cross-linking
Thermal stability
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Summary:Aromatic copolyimides (PIx) and aromatic-aliphatic copolyimides (PIxEOy) were synthesized by reacting 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with mixtures obtained from 2,2′-bis(4-aminophenyl)hexafluoropropane (6FpDA), 5-diaminobenzoic acid (DABA) and Jeffamine ED-2003 (PEO). The selective thermal removal of PEO from PIxEOy yielded membranes with high thermal stability and good mechanical properties. The presence of carboxylic groups minimized the shrinkage during the cross-linking process. The membranes containing 10 mol% DABA exhibited good O2/N2 and CO2/CH4 separation performance, and resistance to CO2 plasticization. PIx/PIxEOy blends containing less than 10 wt% PEO were prepared. The CO2/CH4 selectivity/permeability balance of cross-linked membranes largely exceeded that of PIx. The results highlight a possible strategy for using analogous cross-linkable polymers exhibiting ethylene oxide moieties as mere additive to prepare high free volume polyimide's membranes, exhibiting enhanced separation properties and high resistance to plasticization. [Display omitted] •Cross-linkable copolyimides with carboxyl and ethylene oxide groups were obtained.•Selective thermal removal of ethylene oxide groups was achieved.•Membrane's shrinkage due to cross-linking was low.•Gas separation performance and resistance to CO2 plasticization were improved.•Cross-linkable copolyimides were used as additives to better membrane performance.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2022.124789