Probing the construction mechanism of polyamide membranes regulated by interfacial polymerization from the novel micro- and macro- perspectives: A review

Zhang, Xinyue; Zhang, Huihui; Wang, Lei; Wang, Jin; Wang, Xudong; Hao, Jiajin

doi:10.1016/j.desal.2024.117422

Desalination

2024

DOI: 10.1016/j.desal.2024.117422

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Probing the construction mechanism of polyamide membranes regulated by interfacial polymerization from the novel micro- and macro- perspectives: A review

Xinyue Zhang,

Huihui Zhang,

Lei Wang

et al.

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2024

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Cited by 6 publications

References 197 publications

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A Nanofiltration Membrane Preparation Process Based on Polyethyleneimine Diffusion Modulation and Surface Modification

Gu,

Wang,

Fang

et al. 2024

J of Applied Polymer Sci

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Nanofiltration (NF) membranes play a huge role in industrial manufacturing with their unique selective permeability. Membrane material and structure are the main factors affecting the effectiveness of NF separation. Typically, NF membranes are produced by interfacial polymerization (IP). Therefore, control of the IP process is particularly important. This work provides a NF membrane preparation process by combining internal modulation of the separation layer and surface modification. The diffusion of polyethyleneimine (PEI) molecules is accelerated by the introduction of ethanol and cetyltrimethylammonium bromide into the PEI aqueous phase solution, resulting in the formation of a loose interior. In addition, the high selectivity is maintained by high molecular weight PEI modifying. After optimizing the process, the NF membrane permeate flux and selectivity can be increased compared to the blank group (MgCl2 desalination from 90% to 97%, permeate flux from 17 to 35 L m−2 h−1). The resulting PEI/TMC NF membranes also show excellent separation properties in mixed salt applications for magnesium‐lithium separation.

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A Nanofiltration Membrane Preparation Process Based on Polyethyleneimine Diffusion Modulation and Surface Modification

Gu,

Wang,

Fang

et al. 2024

J of Applied Polymer Sci

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Performance regulation of the TFC NF membrane via the introduction of oleic acid into different organic solvents

Lu,

Ning,

Zong

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDTailored design of high‐performance nanofiltration membranes is desirable. The physicochemical properties of the organic phaseare essential for the preparation of nanofiltration membranes. Therefore, byfine‐tuning the organic phase, it is possible to achieve nanofiltrationmembranes with enhanced performance.RESULTSIn this work, oleic acid, a naturally extracted fatty acid, wasintroduced into three different organic solvents (n‐heptane, n‐octane andisopar G) to construct special oil phases for interfacial polymerization. Testingresults showed that proper dosage of oleic acid addition can effectivelydecrease the nanofiltration membrane pore size and enhance the salt rejectionregardless of the solvent type. Taking n‐octane as example, 5% oleic acidaddition in it can decrease the mean pore size from 0.500 nm to 0.341 nm and improve the MgSO4 rejection from 52.4% to 95.5%. Further characterizationindicated that the introduction of oleic acid into organic solvent cansignificantly reduce the interfacial tension and promote the diffusion of piperazinefrom aqueous phase to the oil phase. In addition, oleic acid could react with piperazineand produce some white particles that could be embed into the polyamide layer, thus altering the surface morphology.CONCLUSIONIn this work, a novel modified thin film composite nanofiltration membrane was prepared by a simple and controllable oleic acid assisted interfacial polymerization strategy, which exhibits good water permeability, solute selectivity and antifouling property. Without changing the existing process, our strategy opens up a simple, environmentally friendly and operable route for the synthesis of thin film composite nanofiltration membranes. © 2024 Society of Chemical Industry (SCI).

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Heat‐Resistant Strong Adhesive Consisting of Aromatic Polyamide With an Acid‐Removable N‐Protecting Group and a Thermal Acid Generator

Katoh,

Takai,

Shirakawa

et al. 2024

Journal of Polymer Science

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We present a heat‐resistant strong adhesive system consisting of aromatic polyamide substituted with N‐tert‐butoxycarbonyl (Boc) groups, synthesized by polycondensation of bis(4‐Boc‐aminophenyl) ether (1) and isophthaloyl chloride (2), together with a thermal acid generator (TAG). Upon heating, the Boc groups are readily removed by the TAG‐generated acid, affording N‐H polyamide. Adhesion was conducted at 150°C or 250°C under a pressure of 10 kgf/cm2 for 7 h to eliminate voids due to Boc‐derived gaseous CO2 and isobutene. For metal adherends treated at 150°C, the adhesion strength was 2–3 MPa. However, upon treatment at 250°C, above the Tg of N‐H polyamide (236°C), the adhesion strength reached 7.43–6.25 MPa for sandblasted steel plate, cold commercial (SPCC) and stainless steel. Next, we prepared copolyamides with lower Tg values from 1, bis(4‐methylaminophenyl) ether (3), and 2. Upon treatment at 150°C, the adhesion strength of SPCC with copolyamide consisting of 30% 1 and 70% 3 reached 6.83 MPa. As regards heat resistance, SPCC treated with N‐Boc polyamide/TAG at 250°C maintained an adhesion strength of 7.0–7.5 MPa from room temperature to 250°C, whereas SPCC treated with copolyamide/TAG at 150°C maintained an adhesion strength of 6.8–8.2 MPa up to 200°C.

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Probing the construction mechanism of polyamide membranes regulated by interfacial polymerization from the novel micro- and macro- perspectives: A review

Cited by 6 publications

References 197 publications

A Nanofiltration Membrane Preparation Process Based on Polyethyleneimine Diffusion Modulation and Surface Modification

A Nanofiltration Membrane Preparation Process Based on Polyethyleneimine Diffusion Modulation and Surface Modification

Performance regulation of the TFC NF membrane via the introduction of oleic acid into different organic solvents

Heat‐Resistant Strong Adhesive Consisting of Aromatic Polyamide With an Acid‐Removable N‐Protecting Group and a Thermal Acid Generator

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