Optical properties of azo-based poly(azomethine)s with aromatic fluorinated fragments, ether linkages and aliphatic units in the backbone

Ткаченко, І. М.; Kurioz, Yu.; Kovalchuk, A. I.; Kobzar, Yaroslav L.; Shekera, О.V.; Tereshchenko, A. G.; Nazarenko, V. G.; Шевченко, В.В.

doi:10.1080/15421406.2020.1731080

Cited by 13 publications

(11 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…480 kJ/mol), which contributes to their role in several applications [2]. For instance, FOPs are widely applicable in the areas of medicines in various therapeutic elds, biomedical research, electronic, opti-electronic, high-quality coatings, sensors and environmental applications [3][4][5][6]. Their synthesis has also been exploited in the polymer industry, thus enhancing the formation of new materials that possess high-temperature stability, high glass transition temperature, an anti-ammable nature, resistance to solvents, and are applicable for gas separation [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the processability (e.g. solubility) of insoluble organic polymers such as poly(chains): ether, imine, azo-based, imide, ketone, sulfone, etc., in the non-polar media was improved through the incorporation of uorinated linkers that are known for their hydrophobicity nature (immiscibility in water) and very low dipole [4,5,9,11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Per-Fluorinated Azo- and Azomethane-Based Organic Polymers Developed Via Nucleophilic Aromatic Substitution Mechanism: Synthesis, Thermal, Optical Properties, Porosity and Environmental Applications

Altarawneh

El‐Kaderi

Richard

et al. 2022

Preprint

View full text Add to dashboard Cite

A new series of ether-linked, per-fluorinated organic polymers bearing azo- (-N = N-) and azomethane (-C = N-) organic linkers was reported. The synthetic methodology relied on applying the nucleophilic aromatic substitution reaction (NAS) to fluorinated linkers (e.g. decafluorobiphenyl and hexaflourobenzene) and diols of azo- and azomethane linkers. The successful formation of the new structures revealing ether-linkage substitution of selected fluorine sites was confirmed by 1H-, 13C-, 19F-NMR and FTIR. All polymers were thermally stable in the range of 350–500 °C due to the variation of fluorine and nitrogen contents. The extended conjugation of the polymers was confirmed by the changes in the UV-Vis spectra of the organic linkers and their corresponding polymers. A notable hypsochromic shift was observed in all cases, which was more pronounced with azo-based fluorinated chains due to the H-bonding on the nitrogen sites, chain conformations and planarity. The optical band gap (Eg) of the polymers was determined from the UV-Vis. The Eg values of azo-based fluorinated polymers were higher by 1eV compared to their corresponding linkers. The 19F-NMR analysis confirmed two types of NAS on both the ortho- and para- positions of the fluorinated linkers. These connections created the possibility of developing cross-linked frameworks beside the open-chain confirmation with tailored hydrophobic nature. The cross-linking formation was characterized by porosity measurements, including surface area (SA), pore size and pore volume. The highest measured values were recorded for the azo-based polymer (DAB-Z-1h), which reached 438 m2/g and a pore volume of 0.35 cm3/g. A surface area of 105 m2/g was the lowest for the open-chain azomethane-based polymer (DAB-A-1O) with a pore volume of 0.0872 cm3/g. The beneficial formation of porous structures with varied hydrophobic nature was investigated as adsorbents for separating water/benzene, water/phenol and the selective binding of methane/carbon dioxide gases from the air. The most hydrophobic polymers that contain the decafluorbiphenyl linker were suitable for benzene separation, and the superior methane uptake values were 6.14 and 3.46 mg/g, for DAB-Z-1O and DAB-A-1O, respectively. On the other hand, DAB-Z-1h, with the highest surface area (438 m2/g) and rich with nitrogen sites, has the highest CO2 uptake at 298 K (17.25 mg/g).

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Per-Fluorinated Azo- and Azomethane-Based Organic Polymers Developed Via Nucleophilic Aromatic Substitution Mechanism: Synthesis, Thermal, Optical Properties, Porosity and Environmental Applications

Altarawneh

El‐Kaderi

Richard

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Research is underway to improve the complex of properties of polymer dielectrics by means of their chemical modification, 38 the introduction of fillers of various natures into their composition 9,34,35 . Among all non‐porous polymer materials, polytetrafluoroethylene (PTFE) exhibit the lowest dielectric constant (ε' ~ 2) 26 . This class of polymers has a low degree of water absorption, high thermal (~250°C), and chemical stability 3 .…”

Section: Introductionmentioning

confidence: 99%

“…2 In this regard, at present, preference is given to relatively cheap polymer dielectrics with a lower dielectric constant, high mechanical properties, and manufacturability. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] Polyimides, 15,[17][18][19][20] polybenzoxazole, 21 polyarylene ethers, 14,[22][23][24][25] polytetrafluoroethylene, 26,27 polyethylene, 28 polyurethanes [29][30][31][32] are widely used as dielectrics. Research is underway to improve the complex of properties of polymer dielectrics by means of their chemical modification, 38 the introduction of fillers of various natures into their composition.…”

Section: Introductionmentioning

confidence: 99%

“…9,34,35 Among all non-porous polymer materials, polytetrafluoroethylene (PTFE) exhibit the lowest dielectric constant (ε' ~2). 26 This class of polymers has a low degree of water absorption, high thermal (~250 C), and chemical stability. 3 However, PTFE is a highly crystalline polymer, which makes it impossible to process it using traditional methods and requires the use of more complex and expensive technological processes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric properties of organophosphorus polyurethane ionomers

Davletbaeva

Sazonov

Nikitina

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

The dielectric and physical‐mechanical properties of organophosphorus polyurethane ionomers based on the ethers and aminoethers of ortho‐phosphoric acid have been investigated. The influence of the content of ionogenic groups and polyphosphate structures on the dielectric properties of polyurethanes has been analyzed. It is shown that the values of dielectric permittivity and tangent of dielectric loss in a wide frequency range increase with the content of ionogenic groups in polyurethanes studied. In this case, the increase in conductivity is diffusive in nature and is due to the mobility of protons within the phosphate anion clusters. The compositions of samples with a combination of high dielectric properties and excellent physical‐mechanical and adhesion characteristics have been determined. These are samples in which polyphosphate structures are present in addition to phosphate anions.

show abstract

Fluorinated Oligoazomethine with Azo Groups in the Main Chain as Stimuli-Responsive Photoactive Materials

Kurioz

Ткаченко

Kovalchuk

et al. 2023

Springer Proceedings in Physics

View full text Add to dashboard Cite

Optical properties of azo-based poly(azomethine)s with aromatic fluorinated fragments, ether linkages and aliphatic units in the backbone

Cited by 13 publications

References 44 publications

Per-Fluorinated Azo- and Azomethane-Based Organic Polymers Developed Via Nucleophilic Aromatic Substitution Mechanism: Synthesis, Thermal, Optical Properties, Porosity and Environmental Applications

Per-Fluorinated Azo- and Azomethane-Based Organic Polymers Developed Via Nucleophilic Aromatic Substitution Mechanism: Synthesis, Thermal, Optical Properties, Porosity and Environmental Applications

Dielectric properties of organophosphorus polyurethane ionomers

Fluorinated Oligoazomethine with Azo Groups in the Main Chain as Stimuli-Responsive Photoactive Materials

Contact Info

Product

Resources

About