Membrane and Films Based on Novel Crown-Containing Dyes as Promising Chemosensoring Materials

Zaitsev, S. Yu.; Solovieva, Daria O.; Zaitsev, Ilia S.

doi:10.3390/ma3125293

Cited by 4 publications

(9 citation statements)

References 32 publications

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“…Non‐catalyzed neat ROLs are rapidly cured at elevated temperatures 6,9–12,16,18–30,35,42–48 or in the presence of acidic catalysts, 6,25 maleic anhydride, 36 bis‐maleimides, 36 etc. At 140–170°С, unsaturated aromatic ethers and esters incorporated into ROLs undergo three‐dimensional radical polymerization (TFRP) and yield a densely cross‐linked glassy copolymer with a primary polymer network 6,9,11,12,17,19 .…”

Section: Resultsmentioning

confidence: 99%

“…According to the results of earlier studies, the cured ROLs have high thermo‐oxidative stability (250–320°С) and good dielectric properties, which are resistant to hot strong acids and alkalis 20 . ROLs find applications as thermostable non‐porous impregnating compounds (clear castings), sealing compounds, vacuum‐dense glues, protective coatings, and binders for composites 6,9–11,21–36 …”

Section: Introductionmentioning

confidence: 99%

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Thermal and thermomechanical properties of rolivsan unsaturated resins co‐cured with bisphenol A dicyanate

Zaitsev

Kleptsova

Shvabskaya

2023

Polymer Engineering & Sci

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The present work discusses the experimental verification of the efficiency of a new method of chemical modification of thermosetting resins. The method is based on the use of (nano)micron-sized interlayers that appear between densely crosslinked grains of a glassy network polymer during threedimensional radical polymerization of unsaturated monomers (oligomers). These interlayers act as self-contained microreactors, into which different polyfunctional compounds can be introduced for carrying out the desired chemical reactions. Thermal and dynamic mechanical analysis, differential scanning calorimetry, and Fourier transform infrared spectroscopy were used to investigate the influence of regimes of thermocatalytic co-curing of rolivsan unsaturated resins (ROLs) with bisphenol A dicyanate (BADCy) on thermal and thermomechanical properties of the obtained crosslinked polymers. It was found that the cured ROL/BADCy blends with high (25-50 wt%) content of the BADCy component had less favorable thermal and mechanical parameters than the cured neat ROL. When the BADCy component of a ROL/BADCy blend played the role of a polyfunctional (modifying) additive (5-7.5 wt%) that migrated into "microreactors" and entered into ter-molecular and other reactions, the final cross-linked ROL-BADCy blends had better high-temperature strength, higher stability against thermo-oxidative and hydrolytic destruction than the individual components (i.e., the cured neat ROL and the cured neat BADCy). As the chemical structure may comprise two networks covalently bound to each other, they can be considered as block copolymers. The obtained results confirm the efficiency of the proposed method of chemical modification of unsaturated thermosetting resins, such as ROLs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal and thermomechanical properties of rolivsan unsaturated resins co‐cured with bisphenol A dicyanate

Zaitsev

Kleptsova

Shvabskaya

2023

Polymer Engineering & Sci

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“…According to related research, the conductivity of an IEM is affected by three factors: the network structure within the membrane, the relative size of the IEC, and the composition of the exchange group [26,44,45]. The strength of the electrostatic coactions between the functional group fixed on the membrane and the cations reportedly relies on the membrane surface charge density and the cation valence [46]. The membrane fixed-charge concentration increased with the SiO 2 /Al 2 O 3 /ZnO nanoparticle blending, and thus, the membrane area resistance decreased [26].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Nano-SiO2/Al2O3/ZnO-Blended PVDF Cation-Exchange Membranes with Improved Membrane Permselectivity and Oxidation Stability

et al. 2018

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Ion exchange membranes are used in practically every industry; however, most of them have defects such as low permeability and poor oxidation resistance. In this paper, cation-exchange membranes were prepared with poly (vinylidene fluoride) (PVDF) blended with nano-SiO2, nano-Al2O3 and nano-ZnO. Sulfonic acid groups were injected into the membrane prepared by styrene grafting and sulfonation. The methods used for characterizing the prepared membranes were Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and electrochemical measurements. Membrane performance, such as the ion exchange capacity (IEC), water uptake (WU), transport number, membrane permselectivity, membrane resistance, functional groups, and morphology were also evaluated. The hydrophilia, IEC, and permselectivity of cation-exchange membranes depended on the nanoparticle content of the membrane matrix. High transport property values were obtained, which increased with increasing nano-SiO2/Al2O3/ZnO weight fractions. Finally, the cation-exchange membranes prepared with 1.5% nano-SiO2, 2.0% nano-Al2O3 or 2.0% nano-ZnO all exhibited excellent membrane properties, including membrane permselectivity (PVDF/2% ZnO-g-PSSA membranes, 94.9%), IEC (PVDF/2% Al2O3-g-PSSA membranes, 2.735 mmol·g−1), and oxidation resistance (PVDF/1.5% SiO2-g-PSSA membranes, 2.33%). They can be used to separate applications in a variety of different areas, such as water treatment, electro-driven separation, heavy metal smelting, or other electrochemical processes.

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“…The UV-Vis measurements were obtained using a UVD-3500 double-beam spectrometer, and the IR spectra were recorded on a Bruker Tensor 27 FT-IR spectrometer. The NMR spectra were measured either in chloroform-d 1 or DMSO-d 6 using a Bruker Advance spectrometer operating at 500 MHz for 1 H and 125 MHz for 13 C. The residual solvent peaks were used as an internal reference for the chemical shifts (δ, ppm). The MS spectra were recorded on a Varian 310 MS LC/MS/MS triple quadrupole mass spectrometer fitted with an electrospray ionization interface (ESI).…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Structural Analysis of a Nitrobenzofurazan Derivative of Dibenzo-18-Crown-6 Ether

et al. 2022

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Nitrobenzofurazan derivatives are well known for their fluorescence, whilst crown ethers are known for their complexing capacity toward cationic species. In this study, we present the synthesis and structural characterization of a new derivative containing both nitrobenzofurazan moieties and a crown ether core. The new compound was obtained from dibenzo-18-crown-6 ether, which was first nitrated, reduced to the corresponding amine, and subsequently derivatized with NBD. Structural analyses performed by IR, NMR, UV–Vis, and MS confirmed its structure and physico-chemical behavior toward the complexation of alkaline cations.

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Membrane and Films Based on Novel Crown-Containing Dyes as Promising Chemosensoring Materials

Cited by 4 publications

References 32 publications

Thermal and thermomechanical properties of rolivsan unsaturated resins co‐cured with bisphenol A dicyanate

Thermal and thermomechanical properties of rolivsan unsaturated resins co‐cured with bisphenol A dicyanate

Preparation of Nano-SiO2/Al2O3/ZnO-Blended PVDF Cation-Exchange Membranes with Improved Membrane Permselectivity and Oxidation Stability

Synthesis and Structural Analysis of a Nitrobenzofurazan Derivative of Dibenzo-18-Crown-6 Ether

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