For the first time, copolymers of polyphenylene sulfone (PPSU) with cardo fragments of phenolphthalein (PP) were synthesized to develop highly permeable flat-sheet ultrafiltration membranes. By introducing cardo fragments into the polymer chain, we achieved a mechanical strength 1.3 times higher than the strength of commercial PPSU. It is shown that the introduction of the cardo monomer significantly increases the solubility of the polymer in aprotic solvents. The highest solubility is observed at the concentration of PP 50 mol.%. It is found that reduced viscosity of cardo polymer solutions leads to an increase in the coagulation rate. The permeance of asymmetric ultrafiltration membranes increases with PP concentration from 17.5 L/(m²·h·bar) (10 mol.% PP) to 85.2 L/(m²·h·bar) (90 mol.% PP). These data are in agreement with the results of a study of the coagulation rate of polymer solutions. Thus, for ultrafiltration membranes with 1.5–8 times higher permeance in comparison with PPSU due to the introduction of cardo fragments in the polymer chain, possessing high rejection of the model dye Blue Dextran (M_W = 70,000 g/mol), more than 99.2%, as well as high strength characteristics, were achieved.

The use of a reactive copolymer—poly alkenyl succinic anhydride, which is capable of being involved in the curing reaction—as a modifier of epoxy systems is considered. The copolymer compatibility with the epoxy system’s components; the impact, mechanical, adhesive, and thermal properties of cured samples; and their morphology are studied. The dual role played by the copolymer in modifying epoxy systems is demonstrated. For systems modified with this copolymer, a significant increase in strength, impact toughness, and adhesive strength is achieved.

Research works on the development of urethane-forming compositions and carbon- and glass-fiber-reinforced plastics based on them obtained by vacuum infusion are continued. A laboratory thermovacuum infusion unit is created. Prototype samples of such composites are obtained and tested. Correlations between the qualitative indicators (viscosity, hydroxyl number (HN)) of component A in polyurethane (PU) binders and between the HN and physical and mechanical indicators of cured binders are found. It is shown that the dependences of the strength and Young modulus of PU films increase with increasing values of the HN and have an exponential and polynomial character of the dependence. An attempt is made to find explanations for the observed phenomena. It is found that the same regularities are observed on the composites as on PU films: the physical and mechanical indicators of carbon- and glass-fiber-reinforced plastics increase with an increase in the values of the HN.

Modification of the epoxy matrix was performed using a complex elastomeric agent, which consisted of ether cyclocarbonate compounds with different functionalities. The mechanical and adhesive properties of the resulting epoxyurethane formulations were investigated. The potential applications of these experimental formulations as adhesives, sealants, and flexible plastics were demonstrated.

The geometry and structure of hollow fiber membranes fabricated from polysulfone by the dry-wet phase inversion method were studied with the help of scanning electron microscopy. Various amine hardeners and difunctional polyetheramines were analyzed as potential components of sealing compounds. The fabricated hollow fiber membranes were sealed in model membrane modules using epoxy sealing compounds with different hardeners. The applicability of these materials was assessed based on the presence of defects when gases were supplied under pressure at the contact point between the membrane and the epoxy. The use of polyetheramine as an amine hardener for the epoxy systems caused no defects at the point of contact between the hollow fiber membranes and the epoxy compound, even when pressures up to 0.5 atm were applied. This ensures high selectivity values for the He/N ₂ gas pair in the resulting membrane modules.