Abstract A series of previously synthesized homoleptic and heteroleptic complexes of zirconium and hafnium were used for the polymerization of ethylene. Upon activation with methylaluminoxane, all the complexes serve as pre-catalysts for the polymerization of ethylene. The effects of polymerization time, reaction temperature, solvents, and methylaluminoxane to catalyst ratio on the polyethylene yield

Abstract The work is focused on the investigation of the influence of the amount of co-agent on cross-linking and properties of rubber compounds. The in-situ radical polymerization of zinc dimethacrylate occurs during the curing process of rubber compounds with organic peroxide. Polymerized zinc dimethacrylate tends to form different types of chemical and physical linkages within the rubber matrices

Abstract A series of novel co-polynaphthalimides were synthesized from 1,4,5,8-naphthalene tetracarboxylic dianhydride, 9,9-bis(4-aminophenyl) fluorene and various bis(ether amine)s by high-temperature solution polycondensation reaction. The synthesized polymers were characterized using FTIR and elemental analysis techniques. As a result, all polymers were soluble in m-cresol and some of them were

Abstract The work is focused on the investigation of the effect of dicumyl peroxide as curing agent and zinc dimethacrylate as co-agent on morphology, cross-linking and properties of rubber vulcanizates, in which the amount of zinc dimethacrylate was kept constant and amount of peroxide was varied. The cross-link density of vulcanizates increased proportionally to the amount of dicumyl peroxide. The

Abstract This study highlights the method of synthesis and characterization of a novel hybrid material consisting of zinc cobaltite (ZnCo2O4) and the conductive copolymer based on pyrrole and N-methyl pyrrole. The pure ZnCo2O4 is synthesized by sol-gel method, polypyrrole-ZnCo2O4, poly(N-methyl pyrrole)-ZnCo2O4 and poly(pyrrole-co-N-methyl pyrrole)-ZnCo2O4 are synthesized by chemical oxidative polymerization

Abstract Polyoxymethylene/thermoplastic polyether elastomer composites were prepared by using the chain extender based on styrene, methyl methacrylate and glycidyl methacrylate copolymer as the reaction compatibilizer. The composites were fabricated by melt extrusion, and the content of thermoplastic polyether elastomer varied from 0 to 25 phr, while the amount of the chain extender was 0.2, 0.4, and

Abstract Psyllium has been explored for various food and pharmaceutical applications. Recently, its therapeutic action against cancer has been reported. Hence, herein in this research it has been modified to develop hydrogels through graft copolymerization reaction for use as sustained drug delivery carriers for anti-cancer drug “5-fluorouracil” (FU) to enhance the therapeutic potential. Synthesis

Abstract The present study aimed to conduct the ethylene polymerization using two binary catalytic systems to evaluate the resulting reactor blend of polyethylene. Subsequently, the study continued to explore the effects of catalyst to monomer molar ratio, reaction temperature, ethylene pressure and nanofillers on the catalysts activity, molar mass, thermal behavior, structural and morphological properties

Abstract A new type of aromatic ionomers is obtained by the interaction of aromatic ionogenic polymer, sulfonated polyphenylquinoxaline, with hydroxides of alkali metals (Li, Na, and K). It is found that introduction of the metal strongly affects the aggregation of ionomer macromolecules which is associated with both the specific intermolecular interaction between ionic groups and the interaction between

Abstract The regularities of the controlled synthesis of amphiphilic copolymers of styrene and acrylic acid mediated by dithiobenzoate and trithiocarbonates as reversible addition fragmentation chain transfer agents in a 1,4-dioxane solution are considered. The influence of the general composition and chain microstructure on the dispersion stability and hydrodynamic sizes of polymer particles of copolymers

Abstract The method of obtaining hydrogels from sodium alginate interpolymer complexes with the copolymer of methyl vinyl ether and maleic anhydride is developed. It is shown that the interpolymer network is formed via hydrogen bonding between the hydroxyl groups of alginate and the carboxyl groups of the copolymer. The structure of the network, namely, the type of bonds and their density, is primarily

Abstract To develop the colorless transparent fluorinated polyimide (PI) with low coefficient of thermal expansion (CTE) and high tensile strength, a series of ternary copolymerized fluorinated PIs were synthesized by 4,4-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,2'-bis(trifluoromethyl) benzidine (TFMB), and the third monomer 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA). The

Abstract The effect of substituent nature and position on a series of late transition metal catalysts based on nickel (A–D) was investigated practically and theoretically. Catalyst A bearing isopropyl groups on the ortho position showed the highest activity while for the ortho and para chlorine substituted catalysts B–D insignificant activities were observed. These experimental results were confirmed

Abstract Certain quantitative parameters characterizing the Cu(0)-mediated SET polymerization of methyl acrylate, that is, the kinetic orders of the polymerization rate with respect to the concentration of the monomer and initiator and the rate constants of initiation under various conditions, are determined. A method for the separate determination of Cu(I) and Cu(II) ions during polymerization is

Abstract A comparative study of the thermal behavior of acrylonitrile-acrylic acid copolymers synthesized by conventional radical polymerization and reversible addition-fragmentation chain transfer polymerization to deep conversions with different modes of introducing acrylic acid into the reaction is carried out. It is shown that, at similar average compositions of conventional copolymers, the difference

Abstract New copolymers of norbornene and 1,5-bis(hexenyl-5)-1,1,3,3,5,5-hexamethyltrisiloxane containing flexible siloxane and rigid norbornene fragments in the main chain are synthesized. Synthesis is carried out using three types of olefin metathesis reactions: the ring-opening metathesis polymerization of norbornene, the metathesis of nonconjugated diene 1,5-bis(hexenyl-5)-1,1,3,3,5,5-hexamethyltrisiloxane

Abstract A facile strategy for hydrophobic films based on oil-infused polystyrene microspheres with the unit of γ-methacryloxypropyltrimethoxysilane is demonstrated. Specifically, the rough polystyrene microspheres with unit of γ-methacryloxypropyltrimethoxysilane are synthesized by suspension polymerization. These hydrophobic films were used, for the first time, as rough substrates for loading low

Abstract Graft copolymer containing ester and amide linkages was synthesized by ring opening polymerization of ε-caprolactone, followed by reaction with acrylamide and synthesis of macromonomer and further radical polymerization of macromonomer. The synthesized graft copolymer was characterized and its bactericidal and fungicide degradation efficiency was examined. It was shown that biodegradation

Abstract— The possibility of surface modification of detonation nanodiamonds to give them dispersability in methyl methacrylate is considered. In situ polymer composites are obtained by classical radical polymerization and reversible chain-transfer polymerization based on stable sols of detonation nanodiamonds in a monomer. Evidence that nanodiamonds are dispersed in a polymer matrix up to a size of

Abstract The compositions of alumoboro- and alumochromophosphate with a tetratomic alcohol, pentaerythritol, which is the component forming hydrogen and chemical bonds with the phosphate groups, are considered. The extremum dependence of the softening point on the concentration of pentaerythritol accompanied by a symbatic change in the moisture resistance is found. The heat and thermal resistance,

Abstract Interpolyelectrolyte complexes of a linear cationic polymer poly(diallyldimethylammonium chloride) and anionic microgel particles with carboxyl groups in a pH 6 buffer solution are presented. Dispersions of the microgel and its complexes—negatively charged with a 3-fold molar excess of the anionic groups of the microgel and positively charged with a 3-fold molar excess of the cationic groups

Abstract The reactive mixing of poly(N-vinylpyrrolidone) modified by the introduction of anchor oxirane fragments with polymers of various nature containing N–H unsubstituted tetrazole rings is carried out. Amphiphilic and polyelectrolyte network paired polymers of the conetwork type are obtained which are capable of limited swelling in aqueous media accompanied by the formation of hydrogels sensitive

Abstract The state of the art of materials science in the field of synthesis of promising functional thermoelastoplasts based on polyurethanes and poly(urethane ureas) is analyzed. Interest in these materials has remained high during the past two decades owing to the ease of production, biocompatibility, good thermal and mechanical characteristics, and the possibility to adjust properties to a specific

Abstract The comparative reactivity of oleic, linoleic, and linolenic fragments of vegetable oil triglyceride chains in the processes of their conversion to the corresponding hydroxyurethanes is studied. According to DFT quantum-chemical calculations, the linolenic fragments of triglyceride chains are the most reactive. The activation barriers of reactions involving the second cyclocarbonate group

Abstract The laws of dispersion polymerization of n-butyl acrylate in an aqueous-alcoholic medium in the presence of a hydrophilic reversible addition-fragmentation chain-transfer poly(acrylic acid)-based polymeric agent with a trithiocarbonate group within the chain are investigated. It is shown that the portioned introduction of the monomer into the synthesis makes it possible to achieve higher maximum

Abstract A transparent hybrid photopolymer material is synthesized on the basis of (8-acryloyl-1,4-dithia-8-azaspiro[4.5]decan-2-yl)methyl acrylate and 3-[3-(3-mercaptopropyl)-1,1,3,5-tetramethoxy-5,5-diphenyltrisiloxane]propane-1-thiol. Using NMR spectroscopy and MALDI TOF mass spectrometry, the ability of the thiol-siloxane compound to undergo spontaneous hydrolytic condensation during storage is

Abstract The physicomechanical and rheological characteristics of epoxyphosphazene-modified binders based on an epoxy-resorcinol resin and isophorone diamine and diaminodiphenyl sulfone hardeners are investigated. It is shown that the introduction of epoxyphosphazene into the epoxy resin helps to maintain the technological characteristics of the binder at an acceptable level and to attain a 40% increase

Abstract The thermal and thermomechanical properties of polyurethanes based on isophorone diisocyanate and polyfurit crosslinked using various curing agents are studied by differential scanning calorimetry and dynamic mechanical analysis. Two transitions are observed on thermograms in the temperature range from –100 to +150°С. The first transition detected at a temperature below –60°С corresponds to

Abstract A series of polyurethanes, polyureas, and poly(urethane ureas) with flexible blocks based on α,ω-bis(hydroxyalkyl)polydimethylsiloxane and α,ω-bis(aminopropyl)polydimethylsiloxane with molecular weights (5.6 and 0.9) × 103, respectively, is synthesized to obtain artificial vessels by electrospinning. The structure and properties of the polymers are characterized by gel permeation chromatography

Abstract Here we report the synthesis and viscoelastic properties of smart hydrogels based on N-isopropylacrylamide, cationic (3-acrylamidopropyl)trimethylammonium chloride and nanoclay. Hydrogels were prepared by aqueous free radical polymerization. The effect of some salts, N,N '-methylenebisacrylamide, (3-acrylamidopropyl)trimethylammonium chloride and nanoclay content on the viscoelastic properties

Abstract Natural weathering was performed in a Saharan region to characterize its effect on low-density polyethylene (LDPE) films used for greenhouse coverings. The morphological changes, followed by differential scanning calorimetry (DSC), showed that the damages caused by the oxidation of tie molecules increased the lamellae thickness, its distribution and the crystallinity. Wide-angles X-ray diffraction

Abstract Using modified amino ethers of boric acid, porous polyurethanes are synthesized, the porous morphology of which is due to the peculiarities of the hyperbranched macromolecular architecture of amino ethers of boric acid. A change in the structure of amino ethers of boric acid by the introduction of terminal bulky substituents with hydroxyl groups contributes to a change in the size and pore

Abstract Oligomeric hydroxyaryloxycyclotriphosphazenes P3N3Cln(OC6H5)x(OC6H4OH)y are obtained by the polycondensation of phenoxychlorocyclotriphosphazenes with the general formula P3N3Cl(6 − x)(OC6H5)x (x = 3.1, 4.5) with an excess of resorcinol under homogeneous (pyridine) and heterogeneous (K2CO3) acceptance of HCl in a yield of 60–85%. Full substitution of the chlorine atoms in the specified oligomers

Abstract The factors affecting the methanolysis of polycarbonates catalyzed by sodium methylate are studied. The conversion rate increases with an increase in the basic properties of solvents; the rate of methanolysis depending on the amount of solvent (tetrahydrofuran) is described by an extreme dependence. Changes in sodium methylate concentration and temperature have a small effect on the methanolysis

Abstract The effect of conjugated dinitrones N,N-dimethylglyoxaldinitrone, N,N-di-tert-butylglyoxaldinitrone, and N,N-diphenylglyoxaldinitrone on the radical polymerization of styrene initiated by azobis(isobutyronitrile) is studied. It is found that, during the polymerization of styrene at temperatures below 90°C, chains terminate on the studied nitrones to generate high molecular weight nitroxide

Abstract Poly(N-(3-carboxyphenyl)maleimide-alt-styrene) with superior heat-resistance was synthesized by free radical copolymerization and its structure was confirmed by FTIR and NMR spectroscopy. To show the advantages in heat-resistance of the synthesized copolymers, the thermal properties of poly(N-phenylmaleimide-alt-styrene) and poly(N-phenylmaleimide-alt-maleic anhydride) with similar structures

Abstract PEG-based smart hydrogels have excellent properties and are widely used in the drug delivery, tissue engineering and other fields. In this article, a temperature responsive and pH sensitive dual responsive hydrogel which is suitable for water plugging and profile control in the Daqing oil field was prepared via graft copolymerization using polyethylene glycol (Mn = 600, 1000, and 2000) and

Abstract The polymerization of commercial strained cycloalkene, 5-ethylidene-2-norbornene, in the presence of Pd–N-heterocyclic carbene complexes (two of which are synthesized for the first time) containing phosphine or pyridine ligands is studied. Upon activation with borate Na+[B(3,5-(CF3)2C6H3)4)]–, the studied Pd complexes catalyze the polymerization of 5-ethylidene-2-norbornene according to the

Abstract Novel lanthanide thiolate complexes of [LLn(SCH2C6H5)]2(THF) (L2– = [Me2NCH2CH2CH2N{CH2-(3,5-tBu2-C6H2-2-O)}2]2–; Ln = Sm(1), Yb(2)) has been developed for controlled ring-opening polymerization of ε-caprolactone at 20~40°C.

Abstract In recent decades, the need for producing adsorbents with high absorption capacity and easy separation has led to preparation of magnetic absorbents. In this study, green synthesis of iron oxide/cellulose nanocomposite was used to remove metronidazole from aquatic solutions by application of aqueous extract of spent tea waste regarding its effective and magnetic separation capability. The

Abstract A thermal-responsive Y-shaped amphiphilic block copolymer, namely poly(N-isopropylacrylamide-block-[poly(ε-caprolactone)]2 (PNIPAAm-b-PCL2), was synthesized through the combination of atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP) techniques, and its potential as smart anti-cancer drug delivery system was investigated preliminary. The fabricated polymers

Abstract In this study, cross-linked microspheres formed by interpenetrating networks of carboxymethyl cellulose and polyacrylic acid were prepared via inverse-suspension polymerization. The resultant has high adsorption capacity for rare earth ions, can reach 313 mg/g for Ce3+ under the condition of pH 6 at normal temperature. Unique self-creep characteristic gives it a fast-speed adsorption performance

Abstract A phenyl-substituted terephthalamide β-nucleating agent, N,N'-diphenylterephthalamide (DPTH) was synthesized and characterized by Fourier transform infrared spectroscopy (FTIR) and 1H nuclear magnetic resonance (1H NMR). DPTH’s effect on the crystallization and melting behaviors in isotactic polypropylene (iPP) was investigated by differential scanning calorimetry (DSC), wide angle X-ray diffraction

Abstract In this study, a new modified polymer by grafting poly(N-vinylpyrrolidone) onto polyethersulfone was prepared. The polymerization was carried out in a homogenous phase by using N-methyl pyrrolidone as solvent. Crucial parameters affecting the graft copolymerization, such as monomer concentration and absorbed dose were studied. The existence of grafted chains was confirmed by FTIR spectroscopy

Abstract Graphene oxide modified with long flexible hydrocarbon chains attracts increasing interest in toughing and stabilizing polymer nanocomposites. Herein, graphene oxide bearing with two types of long alkyl chains, namely 2-octyldodecylamine (swallow tail) and dodecylamine (linear), were prepared and introduced into polylactide by a master batch melt blending process. Swallow-tailed graphene oxide

Abstract Epoxy-based porous monoliths are prepared by chemically induced phase separation. The roles played by N,N-dimethylformamide (DMF) in both curing and phase separation kinetics are studied in detail. It is found that the addition of DMF not only changes the speed of phase separation, but the way. Meanwhile, the occurrence of secondary phase separation is partly inhibited, which is in favor of

Abstract Methacrylate-containing silsesquioxane–siloxane oligomers with Mw = (2–20) × 103 determined by gel permeation chromatography (GPC) are synthesized by acidohydrolytic copolycondensation of γ‑methacryloxypropyltrimethoxysilane and diorganodialkoxysilanes. According to the data of 29Si NMR spectro-scopy, the molecules of these oligomers contain silsesquioxane units (RSiO1.5)n, where R is a γ-methacryloxypropyl

Abstract The hydrolysis of three hydroxypropyl methylcellulose samples with varying degrees of polymerization by aqueous solutions of trifluoromethanesulfonic acid with a concentration of 1, 2, 3, and 4% at a temperature of 80, 90, 100, and 110°C in a microwave reactor is studied. The completeness of hydrolysis is estimated by 13C NMR spectroscopy of the disappearance of the signal the acetal carbon

Abstract The gas permeability of hydrocarbons (CH4, C2H6, n-C4H10) through four polynorbornenes obtained by modification of the addition poly(5-vinyl-2-norbornene) is studied. Upon modification, both polar (oxirane and thioacetyl fragments) and nonpolar substituents (cyclopropyl and ethyl groups) are introduced into side substituents. The introduction of polar groups leads to a decrease in gas permeability

Abstract Some properties of the product of tetrazolylethyl cellulose ether alkylation are studied. A comparative analysis of a change in the properties of heterochain (tetrazolated cellulose) and carbochain [poly(5-vinyltetrazole)] polymers when ionic N–H unsubstituted tetrazole rings are replaced with N-methyl-substituted ones in their macromolecular structure is performed. It is shown that the structure

Abstract Using transmission electron microscopy and UV–Vis spectroscopy, the effect of the concentration of the silver oligostyrylmonocarboxylate precursor in the range of 0.3–3.2 wt % in the reaction with the ED-20 epoxy resin on the formation of silver nanoparticles at a temperature of 75°C is studied. At the initial carboxylate concentration ≤0.3 wt %, silver nanoparticles with oligostyrylmonocarboxylate

Abstract New high-temperature resistant poly(carboranylmethyldiorganosiloxane)s have been synthesized by the polycondensation of 1,7-bis-[hydroxy(dimethyl)silylmethyl]-m-carborane with bis-(dimethylamino)diorganosilanes. It has been shown that the replacement of dimethylsiloxane units in polymer chain by methylphenylsiloxane or diphenylsiloxane units leads to formation of amorphous polymers. The polymers

Abstract Interpolymer complexes based on chitosan and arabinogalactan with a different degree of sulfation (7.7–40.8%) stable for 30 days are synthesized. The resulting complexes are characterized by scanning electron microscopy, IR spectroscopy, dynamic light scattering, and ζ-potential electrophoretic measurements. The main mechanism of complex formation is considered in terms of the electrostatic

Abstract Features of the synthesis of n-butyl acrylate copolymers with acrylic acid in 1,4-dioxane by free radical reversible addition-fragmentation chain transfer (RAFT) polymerization mediated by symmetric trithiocarbonates are considered. It is shown that the living mechanism of polymerization is realized in the studied systems. The chemical nature of the RAFT agent dictates different chain microstructures

Abstract Poly(aniline-co-4-bromoaniline) nanocomposites were prepared via in situ polymerization in different molar ratio in the presence of Cu2+−monmorillonite. The X-ray diffraction confirmed that the basal space of Cu2+−montmorillonite increased after the organophilization. Poly(aniline-co-4-bromoaniline)/Cu2+−monmorillonite nanocomposites were prepared by intercalating of aniline and 4-bromoaniline

Abstract The conducting film material intended for research in the field of cell technology is obtained on the basis of two biocompatible polymers—aliphatic copolyamide and polypyrrole. The material consists of hybrid nanofibers having the core–shell structure. The film is formed by copolyamide microfibers that are obtained by electrospinning and coated with a polypyrrole nanolayer. Studies show that

Abstract Polypyrrole/titanium dioxide nanocomposites with different compositions (10, 20, and 30 wt % of TiO2 with respect to monomer) were synthesized via in situ miniemulsion polymerization. The FTIR analysis proved the successful synthesis of the aforementioned products. The quasi-spherical nanostructure was observed through SEM images. TEM analysis showed a core–shell structure in which TiO2 nanoparticles

Abstract A new method is developed for the production of composite fibers based on cellulose and vinyltriethoxysilane and formed from N-methylmorpholine-N-oxide solutions. Introduction of the organosilicon additive promotes the activation of cellulose pyrolysis processes, and its choice relies on the presence of a double bond in vinyltriethoxysilane, which can be opened when the temperature rises.

Abstract The polymerization of acrylonitrile under the action of the new initiating system 1.4-diazabicyclo[2.2.2]octane–ethylene oxide is studied. The polymerization initiated by this system is accompanied by the occurrence of intra- and intermolecular chain transfer to the polymer. It is found that cyclic ethers, such as ethylene oxide and tetrahydrofuran, facilitate the reaction of chain transfer

Abstract The copolymers of acrylonitrile and acrylic acid are synthesized for the first time by trithiocarbonate-mediated reversible addition-fragmentation chain transfer polymerization in DMSO at a content of comonomers in the reaction mixture of 40%. Various regimes of acrylic acid introduction into the reaction are tested. This makes it possible to synthesize copolymers with close average composition