Vol 486, No 2 (2019)

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.

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.

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.