Inks for 3D printing were prepared by dispersing bacterial cellulose nanofibers (CNF) functionali... more Inks for 3D printing were prepared by dispersing bacterial cellulose nanofibers (CNF) functionalized with methacrylate groups in a polymerizable deep eutectic solvent (DES) based on choline chloride and acrylic acid with water as a cosolvent. After 3D printing and UV-curing, the double-network composite gel consisting of chemically and physically crosslinked structures composed from sub-networks of modified CNF and polymerized DES, respectively, was formed. The rheological properties of inks, as well as mechanical and shape memory properties of the 3D-printed gels, were investigated in dynamic and static modes. It was shown that the optimal amount of water allows improvement of the mechanical properties of the composite gel due to the formation of closer contacts between the modified CNF. The addition of 12 wt% water results in an increase in strength and ultimate elongation to 11.9 MPa and 300%, respectively, in comparison with 5.5 MPa and 100% for an anhydrous system. At the same ...
Study of the Mechanical Characteristics of Polymer Composite Materials Based on Acrylic Hydrogels and Inorganic Nanoparticles Using Oscillation Rheometry
Bulletin of the Saint Petersburg State Institute of Technology (Technical University)
The production of polymer composite materials based on acrylic gels and such inorganic fillers as... more The production of polymer composite materials based on acrylic gels and such inorganic fillers as bentonite and detonation nanodiamonds, which make it possible to improve physical and mechanical characteristics of gels, was studied. Oscillation rheometry methods were used to study the rheological properties of these materials, based on the dependences of dynamic modules on frequency. The influence of the fillers studied on the values of dynamic modules and the tangent of the mechanical loss angle of the gel was discussed
Effect of Dibenzyltrithiocarbonate on the Kinetics of 5-VINYLTETRAZOLE Radical Polymerization
Izvestiâ Sankt-Peterburgskogo gosudarstvennogo tehnologičeskogo instituta (tehničeskogo universiteta), 2023
The aim of this work was to study the influence of water as a co-solvent on the interaction betwe... more The aim of this work was to study the influence of water as a co-solvent on the interaction between a polymerizable ionic liquid—choline acrylate (ChA)—and bacterial cellulose. Bacterial cellulose dispersed in ChA is a new type of UV-curable biopolymer-based ink that is a prospective material for the 3D printing of green composite ion-gels. Higher cellulose content in inks is beneficial for the ecological and mechanical properties of materials, and leads to increased viscosity and the yield stress of such systems and hampers printability. It was found that the addition of water results in (1) a decrease in the solvent viscosity and yield stress; and (2) a decrease in the stability of dispersion toward phase separation under stress. In this work, an optimal composition in the range of 30–40 wt% water content demonstrating 97–160 Pa of yield stress was found that ensures the printability and stability of inks. The rheological properties of inks and mechanical characteristics (0.7–0.8 ...
3-(5-Phenyl-2H-tetrazol-2-yl)pyridine was synthesized by treating 5-phenyl-1H-tetrazole with pyri... more 3-(5-Phenyl-2H-tetrazol-2-yl)pyridine was synthesized by treating 5-phenyl-1H-tetrazole with pyridin-3-ylboronic acid under Chan–Evans–Lam coupling conditions. The structure and identity were confirmed by 1H, 13C-NMR spectroscopy, IR spectroscopy, UV–Vis spectroscopy, high-resolution mass spectrometry, and TLC. The molecular structure was studied experimentally by sequential X-ray diffraction analysis and theoretically by DFT B3LYP quantum chemistry calculation.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
The emergence and growth of bacterial resistance to antibiotics poses an enormous threat to human... more The emergence and growth of bacterial resistance to antibiotics poses an enormous threat to humanity in the future. In this regard, the discovery of new antibiotics and the improvement of existing ones is a priority task. In this study, we proposed the synthesis of new polymeric conjugates of polymyxin B, which is a clinically approved but limited-use peptide antibiotic. In particular, three carboxylate-bearing polymers and one synthetic glycopolymer were selected for conjugation with polymyxin B (PMX B), namely, poly(α,L-glutamic acid) (PGlu), copolymer of L-glutamic acid and L-phenylalanine (P(Glu-co-Phe)), copolymer of N-vinyl succinamic acid and N-vinylsuccinimide (P(VSAA-co-VSI)), and poly(2-deoxy-2-methacrylamido-D-glucose) (PMAG). Unlike PGlu and PMAG, P(Glu-co-Phe) and P(VSAA-co-VSI) are amphiphilic and form nanoparticles in aqueous media. A number of conjugates with different polymyxin B loading were synthesized and characterized. In addition, the complex conjugates of PGLu...
Journal Scientific and Technical Of Information Technologies, Mechanics and Optics, 2017
Subject of Research. The paper deals with characteristics study of polymer composites based on co... more Subject of Research. The paper deals with characteristics study of polymer composites based on commercially available polyvinyl chloride and biopolymer filler pectin in various weight ratios (1.5 and 10 mass%) for the usage as biodegradable packaging. Method. Biopolymer composite films were obtained by rolling at the temperature of 165-170 °C and pre-mixing of all composition components with a paddle stirrer at a stirring speed of 6000 rpm for four minutes. The introduction of natural materials into the polymer matrix facilitates the decomposition of plastics during disposal, and the processing of К.В. Волкова, И.В. Троценко, М.В. Успенская, В.К. Баля, Е.В. Сивцов, Е.В. Белухичев Научно-технический вестник информационных технологий, механики и оптики, 2017, том 17, No 5 835 composite polymeric materials for five and ten minutes by low-temperature plasma in argon: oxygen modifies the surface of the material, ensuring access of microorganisms for biodegradation. Samples of composites ...
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