Effect of polymer molecular weight on the long-term process stability of crosslinked polybenzimidazole organic solvent nanofiltration (OSN) membranes.
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| Title: | Effect of polymer molecular weight on the long-term process stability of crosslinked polybenzimidazole organic solvent nanofiltration (OSN) membranes. |
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| Authors: | Oxley, Adam1,2 (AUTHOR), Livingston, Andrew G.1,2 (AUTHOR) a.livingston@qmul.ac.uk |
| Source: | Journal of Membrane Science. Jan2024, Vol. 689, pN.PAG-N.PAG. 1p. |
| Subjects: | Molecular weights, Crosslinked polymers, Polymers, Organic solvents, Nanofiltration, Compacting |
| Abstract: | The importance of polymer molecular weight on the long-term performance of polybenzimidazole (PBI) membranes in organic solvents was investigated. PBI membranes were manufactured from two different polymer molecular weights: the standard molecular weight of PBI polymer, used almost universally across literature for organic solvent stable membranes (∼27,000 g mol-1), and an untested ∼ two-fold higher molecular weight (∼60,000 g mol-1). After crosslinking, all PBI membranes were chemically and mechanically stable. However, during continuous long-term pressurised filtration in DMF, the standard molecular weight PBI membranes suffered slow permeance decline over time. This was attributed to rearrangement of the crosslinked polymer chains. Increasing the extent of crosslinking reduced the rate of membrane permeance decline but did not provide a fully process stable membrane. Using a higher molecular weight PBI, and a similar extent of crosslinking, resulted in a membrane with constant permeance and excellent process stability, even during continuous DMF filtration at 120 °C. This was attributed to the increased interchain interactions and entanglement in the high molecular weight polymer, which reduced the rate of chain rearrangement and compaction. This work demonstrates the importance of polymer molecular weight for reducing membrane compaction and providing process stability in organic solvents. [Display omitted] • Membranes were cast from a standard molecular weight (MW) PBI and a high MW PBI. • These membranes were crosslinked with dibromo-p-xylene to different crosslinking extents. • The PBI MW was critically important to the long-term membrane stability. • Only PBI with a high MW and a high crosslinking extent gave membranes stable in DMF. • The standard MW PBI with the same crosslinking extent suffered significant permeance loss. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Membrane Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 173473339 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effect of polymer molecular weight on the long-term process stability of crosslinked polybenzimidazole organic solvent nanofiltration (OSN) membranes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Oxley%2C+Adam%22">Oxley, Adam</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Livingston%2C+Andrew+G%2E%22">Livingston, Andrew G.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> a.livingston@qmul.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Membrane+Science%22">Journal of Membrane Science</searchLink>. Jan2024, Vol. 689, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Molecular+weights%22">Molecular weights</searchLink><br /><searchLink fieldCode="DE" term="%22Crosslinked+polymers%22">Crosslinked polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Polymers%22">Polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Organic+solvents%22">Organic solvents</searchLink><br /><searchLink fieldCode="DE" term="%22Nanofiltration%22">Nanofiltration</searchLink><br /><searchLink fieldCode="DE" term="%22Compacting%22">Compacting</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The importance of polymer molecular weight on the long-term performance of polybenzimidazole (PBI) membranes in organic solvents was investigated. PBI membranes were manufactured from two different polymer molecular weights: the standard molecular weight of PBI polymer, used almost universally across literature for organic solvent stable membranes (∼27,000 g mol-1), and an untested ∼ two-fold higher molecular weight (∼60,000 g mol-1). After crosslinking, all PBI membranes were chemically and mechanically stable. However, during continuous long-term pressurised filtration in DMF, the standard molecular weight PBI membranes suffered slow permeance decline over time. This was attributed to rearrangement of the crosslinked polymer chains. Increasing the extent of crosslinking reduced the rate of membrane permeance decline but did not provide a fully process stable membrane. Using a higher molecular weight PBI, and a similar extent of crosslinking, resulted in a membrane with constant permeance and excellent process stability, even during continuous DMF filtration at 120 °C. This was attributed to the increased interchain interactions and entanglement in the high molecular weight polymer, which reduced the rate of chain rearrangement and compaction. This work demonstrates the importance of polymer molecular weight for reducing membrane compaction and providing process stability in organic solvents. [Display omitted] • Membranes were cast from a standard molecular weight (MW) PBI and a high MW PBI. • These membranes were crosslinked with dibromo-p-xylene to different crosslinking extents. • The PBI MW was critically important to the long-term membrane stability. • Only PBI with a high MW and a high crosslinking extent gave membranes stable in DMF. • The standard MW PBI with the same crosslinking extent suffered significant permeance loss. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Membrane Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.memsci.2023.122149 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Molecular weights Type: general – SubjectFull: Crosslinked polymers Type: general – SubjectFull: Polymers Type: general – SubjectFull: Organic solvents Type: general – SubjectFull: Nanofiltration Type: general – SubjectFull: Compacting Type: general Titles: – TitleFull: Effect of polymer molecular weight on the long-term process stability of crosslinked polybenzimidazole organic solvent nanofiltration (OSN) membranes. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Oxley, Adam – PersonEntity: Name: NameFull: Livingston, Andrew G. IsPartOfRelationships: – BibEntity: Dates: – D: 05 M: 01 Text: Jan2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 03767388 Numbering: – Type: volume Value: 689 Titles: – TitleFull: Journal of Membrane Science Type: main |
| ResultId | 1 |
