Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine Moieties
Mixed matrix membranes (MMMs), derived from three aromatic polyimides (PIs), and an affordable porous organic polymer (POP) having basic bipyridine moieties were prepared. Matrimid and two fluorinated polyimides, which were derived from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride and 2,2′-bi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/12/6/547 |
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| author | Sandra Rico-Martínez Cristina Álvarez Antonio Hernández Jesús A. Miguel Ángel E. Lozano |
| author_facet | Sandra Rico-Martínez Cristina Álvarez Antonio Hernández Jesús A. Miguel Ángel E. Lozano |
| author_sort | Sandra Rico-Martínez |
| collection | DOAJ |
| description | Mixed matrix membranes (MMMs), derived from three aromatic polyimides (PIs), and an affordable porous organic polymer (POP) having basic bipyridine moieties were prepared. Matrimid and two fluorinated polyimides, which were derived from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride and 2,2′-bis(4-aminophenyl)hexafluoropropane (6F6F) or 2,4,6-trimethyl-m-phenylenediamine (6FTMPD), were employed as polymer matrixes. The used POP was a highly microporous material (surface area of 805 m<sup>2</sup> g<sup>−1</sup>) with excellent thermal and chemical stability. The MMMs showed good compatibility between the PIs and POP, high thermal stabilities and glass transition temperatures superior to those of the neat PI membranes, and good mechanical properties. The addition of POP to the matrix led to an increase in the gas diffusivity and, thus, in permeability, which was associated with an increase in the fractional free volume of MMMs. The increase in permeability was higher for the less permeable matrix. For example, at 30 wt.% of POP, the permeability to CO<sub>2</sub> and CH<sub>4</sub> of the MMMs increased by 4- and 7-fold for Matrimid and 3- and 4-fold for 6FTMPD. The highest CH<sub>4</sub> permeability led to a decrease in CO<sub>2</sub>/CH<sub>4</sub> selectivity. The CO<sub>2</sub>/N<sub>2</sub> separation performance was interesting, as the selectivity remained practically constant. Finally, the POP showed no molecular sieving effect towards the C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> and C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> gas pairs, but the permeability increased by about 4-fold and the selectivity was close to that of the matrix. In addition, because the POP can form metal ion bipyridine complexes, modified POP-based MMMs could be employed for olefin/paraffin separations. |
| first_indexed | 2024-03-09T23:06:14Z |
| format | Article |
| id | doaj.art-ca23eeeb3c684c4583d0c18c539d1933 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-09T23:06:14Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-ca23eeeb3c684c4583d0c18c539d19332023-11-23T17:53:42ZengMDPI AGMembranes2077-03752022-05-0112654710.3390/membranes12060547Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine MoietiesSandra Rico-Martínez0Cristina Álvarez1Antonio Hernández2Jesús A. Miguel3Ángel E. Lozano4IU CINQUIMA, University of Valladolid, Paseo Belén 5, E-47011 Valladolid, SpainInstitute for Polymer Science and Technology (ICTP-CSIC), Juan de la Cierva 3, E-28006 Madrid, SpainSurfaces and Porous Materials (SMAP, UA-UVA_CSIC), Associated Research Unit to CSIC, University of Valladolid, Paseo Belén 7, E-47011 Valladolid, SpainIU CINQUIMA, University of Valladolid, Paseo Belén 5, E-47011 Valladolid, SpainIU CINQUIMA, University of Valladolid, Paseo Belén 5, E-47011 Valladolid, SpainMixed matrix membranes (MMMs), derived from three aromatic polyimides (PIs), and an affordable porous organic polymer (POP) having basic bipyridine moieties were prepared. Matrimid and two fluorinated polyimides, which were derived from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride and 2,2′-bis(4-aminophenyl)hexafluoropropane (6F6F) or 2,4,6-trimethyl-m-phenylenediamine (6FTMPD), were employed as polymer matrixes. The used POP was a highly microporous material (surface area of 805 m<sup>2</sup> g<sup>−1</sup>) with excellent thermal and chemical stability. The MMMs showed good compatibility between the PIs and POP, high thermal stabilities and glass transition temperatures superior to those of the neat PI membranes, and good mechanical properties. The addition of POP to the matrix led to an increase in the gas diffusivity and, thus, in permeability, which was associated with an increase in the fractional free volume of MMMs. The increase in permeability was higher for the less permeable matrix. For example, at 30 wt.% of POP, the permeability to CO<sub>2</sub> and CH<sub>4</sub> of the MMMs increased by 4- and 7-fold for Matrimid and 3- and 4-fold for 6FTMPD. The highest CH<sub>4</sub> permeability led to a decrease in CO<sub>2</sub>/CH<sub>4</sub> selectivity. The CO<sub>2</sub>/N<sub>2</sub> separation performance was interesting, as the selectivity remained practically constant. Finally, the POP showed no molecular sieving effect towards the C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> and C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> gas pairs, but the permeability increased by about 4-fold and the selectivity was close to that of the matrix. In addition, because the POP can form metal ion bipyridine complexes, modified POP-based MMMs could be employed for olefin/paraffin separations.https://www.mdpi.com/2077-0375/12/6/547gas separationpolyimidesmixed matrix membranesporous organic polymersCO<sub>2</sub> capture |
| spellingShingle | Sandra Rico-Martínez Cristina Álvarez Antonio Hernández Jesús A. Miguel Ángel E. Lozano Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine Moieties Membranes gas separation polyimides mixed matrix membranes porous organic polymers CO<sub>2</sub> capture |
| title | Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine Moieties |
| title_full | Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine Moieties |
| title_fullStr | Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine Moieties |
| title_full_unstemmed | Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine Moieties |
| title_short | Mixed Matrix Membranes Loaded with a Porous Organic Polymer Having Bipyridine Moieties |
| title_sort | mixed matrix membranes loaded with a porous organic polymer having bipyridine moieties |
| topic | gas separation polyimides mixed matrix membranes porous organic polymers CO<sub>2</sub> capture |
| url | https://www.mdpi.com/2077-0375/12/6/547 |
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