Synthesis of Polyketone Anion Ion Exchange Fibers by Paal-Knorr Reaction and Its Physico-Chemical Properties

Hwang, Soo Hyun; Kim, Jeong Ju; Park, Eun Ji; Hwang, Taek Sung

doi:10.1007/s13233-020-8058-4

Cited by 7 publications

(15 citation statements)

References 17 publications

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“…630.7 and 619.2 eV, which are attributed to the 3d 3/2 and 3d 5/2 features, respectively, occurring due to the spin‐orbit splitting effect. [ 14 ] The total amount of iodine in the different samples is comprised of between 6.5 and 8.4 %at (see Table S2, Supporting Information). A single peak is observed in the O 1s spectral region for all the FPK cm membranes, centered at ca.…”

Section: Resultsmentioning

confidence: 99%

“…The derivatives produced in this way still contain PK moieties since the reaction of the PK 1,4-diketone units is statistically random and does not reach completeness even in excess of amine, maintaining some of the original polymer properties. At present, many functionalized polyethylene pyrroles-co-PKs (FPK)with anionic exchange group (ammonium, [12][13][14] pyridinium, [11,15,16] or imidazolium [17,18] ) have been proposed. Their degree of functionalization, or relative number of diketone units converted to pyrrole, which corresponds to the number of functional side chains, can be easily tuned by changing the amine/PK ratio or the reaction conditions (temperature or reaction time).…”

Section: Introductionmentioning

confidence: 99%

“…Their degree of functionalization, or relative number of diketone units converted to pyrrole, which corresponds to the number of functional side chains, can be easily tuned by changing the amine/PK ratio or the reaction conditions (temperature or reaction time). [14,15] The modification of the polymer composition by introducing ionic and hydrophilic moieties in its structure generally improves its dispersibility and subsequent processability compared to those of the original PK, for which the solvent choice is quite limited (being soluble mainly in cresol or fluorinated alcohols). In their functionalized form, the FPKs powder can be easily dissolved in dimethyl formamide for casting or electrospinning in the preparation of membranes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

Alvi

Vezzù

Pagot

et al. 2022

Macro Chemistry & Physics

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New inorganic-organic hybrid anion exchange membranes are produced after incorporation of tantalum oxide into trimethylammonium-functionalized polyethylene pyrrole-co-polyethylene ketone (functionalized polyketone, FPK), obtained by the chemical modification of a polyketone polymer. The influence of tantalum oxide fillers on the properties of the synthesized membranes is investigated. The interaction between inorganic fillers and the polymer chains is studied using Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR). The thermal analysis of the FPK membranes reveals they are thermally stable at up to 250°C. However, the incorporation of the inorganic fillers reduces the thermal stability. Modulated Differential Scanning Calorimetry (MDSC) results indicate that the inclusion of inorganic fillers leads to an increase in crystallinity. This study reports that the properties of the bulk polymer can be tuned by controlling the degree of functionalization and content of inorganic fillers, as confirmed by Near Ambient Pressure X-Ray Photoelectron Spectroscopy (NAP-XPS) studies. Finally, Broadband Electrical Spectroscopy (BES) studies demonstrate that the hybrid membranes are characterized by several polarization phenomena contributing to the overall ion conductivity of the material, which at RT is of 1.46 and 1.61 mS cm −1 for the FPK cast membrane and the hybrid membrane with 5.0 wt.% of Ta 2 O 5 filler, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

Alvi

Vezzù

Pagot

et al. 2022

Macro Chemistry & Physics

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“…The polyamine fragment consists of three different regions: a carbonyl group (CO) directly connected to the backbone, the polymer backbone including a pyrrolic ring, providing rigidity and stability to the polyamine, and the amine functional group (NH 2 ) connected to the pyrrolic ring through an alkyl chain. The latter is the active part of the polyamine, which is converted into a tri-methyl-ammonium (TMA) group after a methylation reaction with methyl iodide and subsequent OH-exchange (N(CH 3 ) 3 + ), − (Scheme ).…”

Section: Introductionmentioning

confidence: 99%

“…In the present work, DFT simulations were carried out on a monomer of the polyamine (PA) − ,− to study the interactions of water molecules and hydroxide anions with a single monomer, eventually extrapolating information on the hydrophilic/hydrophobic nature of the polymer. In addition, the role of functional groups in ion transport and the influence of the hydration level on the degradation of the cationic group are analyzed.…”

Section: Introductionmentioning

confidence: 99%

Water Uptake in an Anion Exchange Membrane Based on Polyamine: A First-Principles Study

et al. 2022

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An atomistic level study of a single monomer of polyamine interacting with water molecules and hydroxide anions (OH – ) was carried out to investigate the role of the polyamine structure in the hydrated morphology of anion exchange membranes (AEMs) for alkaline fuel cells and its influence on ionic conductivity and chemical stability. DFT calculations were performed to find the ground state of the system, studying the interactions of the solvent species with three different regions of the polymer—the amine functional group, the backbone, and the carbonyl group. The hydrophilic/hydrophobic behavior of each segment was determined, with calculated binding energies and Bader charge analysis providing a more quantitative analysis of the interactions and activation and reaction energies computed to investigate the chemical degradation mechanism. The results show the tendency of both OH – and water molecules to form water clusters in the proximity of the ionized amine group. As such, these regions constitute the preferential pathway for ionic conductivity. Besides, the essential role of the water content is pointed out, not only to enhance conductivity but also to reduce degradation in an alkaline environment. The present work provides a baseline to assess the impact of polymer chemistry on the ionic conductivity of the membrane and acts as the first step for the development of high-performance AEMs and for an improvement of the overall performance of the fuel cell.

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Synthesis and physicochemical characterization of sulfonated polyketone ion exchange membrane using response surface methodology

Lee

Kim

Lim

et al. 2022

Polymers for Advanced Techs

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In this study, the process parameters used for the synthesis of sulfonated polyketone in the preparation of ion exchange membranes were optimized using the response surface methodology (RSM). Sulfonated polyketone ion exchange membranes were prepared by varying three process parameters: concentration of the sulfonating agent, reaction temperature, and reaction time. The properties of the prepared membranes, such as the degree of sulfonation, water uptake, swelling ratio, ion exchange capacity, and mechanical properties, were evaluated. According to the RSM analysis, the degree of sulfonation and swelling ratio of the sulfonated polyketone ion exchange membranes were predominantly affected by the concentration of the sulfonating agent, whereas the water uptake and mechanical properties were predominantly affected by the reaction temperature. The optimal process parameters determined for the synthesis of sulfonated polyketone in the ion exchange membranes are: sulfonating agent concentration of 0.4 wt.%, reaction temperature of 40°C, and reaction time of 62.6 min, which resulted in an ion exchange capacity of 0.88 meq/g. Based on these results, it was concluded that the analysis using RSM is very useful because the experiments and statistical analysis showed similar results.

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Synthesis of Polyketone Anion Ion Exchange Fibers by Paal-Knorr Reaction and Its Physico-Chemical Properties

Cited by 7 publications

References 17 publications

Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

Water Uptake in an Anion Exchange Membrane Based on Polyamine: A First-Principles Study

Synthesis and physicochemical characterization of sulfonated polyketone ion exchange membrane using response surface methodology

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