Открытый доступ
Доступ предоставлен
Только для подписчиков
Том 486, № 2 (2019)
- Год: 2019
- Статей: 4
- URL: https://journal-vniispk.ru/0012-5008/issue/view/9319
Chemistry
Hydrogels and Sponge Materials Based on Triblock Copolymers of Lactide and Ethylene Glycol
Аннотация
New techniques were developed for the preparation of spongy materials and hydrogels based on triblock copolymers of lactide and ethylene glycol with various molecular structures. The effect of composition of the initial copolymers and supramolecular structure on their mechanical characteristics and biocompatibility was studied. According to cytological studies, all materials had a high level of cell viability (CV). The possibility of obtaining hydrogels with elastic moduli of up to 4460 kPa, which is a record high value for such systems, was demonstrated.
149-151
The Reactivity of 3-Hydroxy-6-methyl-2-ethylpyridine 2-Nitroxysuccinate and Reference Drugs in Model NO-Generating Systems
Аннотация
The ability of 3-hydroxy-6-methyl-2-ethylpyridine 2-nitroxysuccinate (I) to generate nitrite ions (\({\text{NO}}_{2}^{ - }\)) and nitrogen monoxide (NO) in model systems with cysteine (Cys) and deoxyhemoglobin (Hb) has been studied. Compound I has been found to release \({\text{NO}}_{2}^{ - }\) and NO more efficiently than Nicorandil. The accumulation rate of \({\text{NO}}_{2}^{ - }\) in the system of Cys with I is by a factor of 1.5 higher than that with Nitroglycerin. It has been shown that, in contrast to Nitroglycerin, compound I is not reduced by Hb.
152-155
New Proton-Conducting Polydiimidazopyridine-Based Membrane for an HT-PEM Fuel Cell
Аннотация
Polydiimidazopyridine was synthesized from 2,3,5,6-tetraaminopyridine and 2,5-dihydroxyterephthalic acid in polyphosphoric acid (PPA) and characterized. Polydiimidazopyridine possessed high viscosity, high thermooxidative stability, and excellent film-forming properties. The polymer was processed from a reaction solution in PPA to proton-conducting membranes featuring high proton conductivity in the temperature range of 20–200°C, being superior in this value to many known membranes.
156-159
Chemical Technology
The Influence of Manganese Oxide on the Sintering and Properties of the Eutectic Ceramics of the ZrO2–Al2O3–SiO2 System
Аннотация
The sintering, microstructure, and phase composition of the eutectic ceramics of the ZrO2–Al2O3–SiO2 system with an MnO additive have been studied. It has been shown that the additive contributes to the decrease in the sintering temperature to 1250–1350°С. The synthesized materials have a high content of the tetragonal phase, a fine crystalline structure with a grain size of 100–600 nm, and high flexural strength up to 420 MPa. The developed low-temperature materials can find application in mechanical engineering as high-temperature machine parts and refractory materials.
160-163