Ionic transport processes in polymer mixture solutions based on quaternized polysulfones

Filimon, Anca; Dobos, Adina Maria; Avram, Ecaterina

doi:10.1016/j.jct.2016.11.031

Cited by 16 publications

(4 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, with an increase in VBC content, both peaks at 915 cm –1 and 1640 cm –1 become more pronounced. Meanwhile, there is a gradual decline in intensity observed for the pyridine peak at 1590 cm –1 , further confirming successful quaternization . Additionally, upon heating, the presence of the −CH 2 – group resulted in an absorption band at 1460 cm –1 .…”

Section: Discussionmentioning

confidence: 69%

“…Meanwhile, there is a gradual decline in intensity observed for the pyridine peak at 1590 cm −1 , further confirming successful quaternization. 28 Additionally, upon heating, the presence of the −CH 2 − group resulted in an absorption band at 1460 cm −1 . The intensity enhancement of this absorption band is indicative of methylene production through cross-linking reaction occurring at the C�C double bond.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Side Chain Crosslinked Anion Exchange Membrane for Acid Concentration by Electrodialysis

He,

Chen,

et al. 2024

Chem Bio Eng.

View full text Add to dashboard Cite

Electrodialysis (ED) technology for waste acid treatment has high economic efficiency and environmentally friendly advantages. The primary limitation of ED in the retrieval of low-concentration spent acids lies in the leakage of hydrogen ions through anion exchange membranes (AEMs) due to its extremely small size and high mobility. To address this issue, a series of AEMs named QPAB-x (x = 3, 5, 7, 10) were designed for acid concentration in ED process by increasing the membrane densities through in situ crosslinking in this study. The successful synthesis of polymers was confirmed through 1 H nuclear magnetic resonance hydrogen ( 1 H NMR) spectroscopy and Attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. Furthermore, ATR-FTIR spectroscopy showed that the higher the side chain content, the higher the crosslinking degree of the membranes. X-ray photoelectron spectroscopy (XPS) was employed to characterize the effects of aqueous and acidic environments on QPAB membranes. The performance disparities between QPAB-x membranes in acidic and aqueous environments were examined separately. Subsequently, the influence of crosslinking degree on the acid-blocking capability of the membranes was thoroughly investigated by conducting ED acid-concentration experiments to monitor the hydrogen ions concentration process and determine the current efficiency and energy consumption of the QPAB-x membranes. Our experimental results demonstrated that QPAB-x membranes with higher cross-linking degrees have lower water content, especially the QPAB-10 membrane with an IEC of approximately 1.5 mmol g −1 and a remarkably low water content of around 10%. This leads to a reduced H + transfer number and excellent acid-blocking properties. Additionally, compared to commercial membrane A2, using the QPAB-10 membrane in the ED process resulted in a higher final H + concentration in the concentrated chamber. Consequently, these synthesized membranes exhibit considerable promise in the field of ED acid recovery.

show abstract

Section: Discussionmentioning

confidence: 69%

Section: ■ Introductionmentioning

confidence: 99%

Side Chain Crosslinked Anion Exchange Membrane for Acid Concentration by Electrodialysis

He,

Chen,

et al. 2024

Chem Bio Eng.

View full text Add to dashboard Cite

show abstract

“…Commercial aromatic polysulfone (PSF, UDEL-3500, Union Carbide Company, Texas), with number-average molecular weight M n = 39,000 g·mol −1 , was used in the synthesis of functionalized polysulfones [ 29 , 30 ]. Cationic polysulfone containing quaternary ammonium side groups (PSFQ, M n = 28,000 g·mol −1 , ionic chlorine content 5.44%; Table 2 ) was synthesized by reacting chloromethylated polysulfone (CMPSF) with a tertiary amine, namely N,N—dimethylbutylamine, according to the detailed procedure presented in previous studies [ 29 , 30 , 70 ].…”

Section: Methodsmentioning

confidence: 99%

Green Blends Based on Ionic Liquids with Improved Performance for Membrane Technology: Perspectives for Environmental Applications

Filimon¹,

Dobos²,

Dumbrava³

et al. 2022

IJMS

View full text Add to dashboard Cite

Present research was directed towards the development of new high-performance and cost-effective polysulfone membranes (PSFQ) by introducing ionic liquids (ILs—Cyphos 101 IL and Aliquat 336) into their matrix. Variation of ILs was performed with the aim to find the one that brings new properties and improves the functionality and selectivity of PSFQ membranes in ultrafiltration processes. Based on the obtained results of the rheological study, we established the compatibility of compounds and optimal content of the used ILs, namely 3 wt% and 15 wt% Cyphos 101 IL and compositions varying between 3 and 15 wt % Aliquat 336. Results indicated that the ILs acted as plasticizers when they were added to the system, a helpful aspect in processing membranes used in water decontamination. The efficiency and performance of the membranes were evaluated by their use in the treatment of diclofenac (DCF)-containing waters. Membranes obtained from PSFQ/Aliquat 336 solution containing 15 wt% IL exhibited a 97% removal degree of DCF in the treatment process of 50 mL solution containing 3 mg/L DCF. The separation efficiency was kept constant for four filtration/cleaning cycles. The results indicated an improvement in membrane performance as the amount of IL in their structure increased, which confirms the potential for application in water treatment processes.

show abstract

“…Commercial aromatic polysulfone in powder form (UDEL-3500-PSF, Union Carbide Company, Houston, TX, USA) (Mn = 39,000 g/mol; Mw/Mn = 1.625) was used in the synthesis of functionalized polysulfones [10][11][12]. Thus, the cationic polysulfone containing quaternary ammonium side groups (PSFQ, Mn = 28,000 g/mol) was synthesized by the reaction of chloromethylated polysulfone (CMPSF with a content in chlorine of 7.42% and Mn = 29,000 g/mol) with a tertiary amine, N,Ndimethylbutylamine (DMBA) [12,26]. The quaternary polymer was isolated from the reaction medium by precipitation in diethylether, washed three times with diethylether, and dried for 48 h under vacuum, at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Design of Biologically Active Surfaces Based on Functionalized Polysulfones by Electrospinning

Filimon¹,

Olaru²,

Doroftei³

et al. 2019

The 23rd International Electronic Conference on Synthetic Organic Chemistry

Self Cite

View full text Add to dashboard Cite

The development of a new generation of electrospun polymeric materials designed to accomplish multi-performance in a bioinspired integrated system represents the main goal of the present research. Polysulfones promise to become such nanosized fibrous structures with attractive properties associated with biomedical applications by the development of a new "construct". Therefore, the homogeneous solutions of the functionalized polysulfones with quaternary ammonium groups (PSFQ) dissolved in various solvents were processed by electrospinning to create polymeric scaffolds that can modulate cellular behavior. Additionally, the antibacterial activity of PSFQ fibers against Gram-negative and Gram-positive bacteria has indicated the potential of these scaffolds for biomedical use.

show abstract

Ionic transport processes in polymer mixture solutions based on quaternized polysulfones

Cited by 16 publications

References 69 publications

Side Chain Crosslinked Anion Exchange Membrane for Acid Concentration by Electrodialysis

Side Chain Crosslinked Anion Exchange Membrane for Acid Concentration by Electrodialysis

Green Blends Based on Ionic Liquids with Improved Performance for Membrane Technology: Perspectives for Environmental Applications

Design of Biologically Active Surfaces Based on Functionalized Polysulfones by Electrospinning

Contact Info

Product

Resources

About