Abstract This paper reports that PPy/PANI blends are successfully synthesized from solution process. For high performance optoelectronic devices, understanding the electrical and optical properties of materials should be significant. The aim of this work is to study the polymer-blend morphologies as well as the electrical and optical properties of materials. The polymer blends were prepared as a function

Abstract In this study, shielding effectiveness for a few composite films was examined. Composites were prepared by combining thermoplastic polyurethane, polyaniline and ferrite cobalt. The composites were synthesized in several steps by the hydrothermal and melt blending method. Different tests were performed to characterize ferrite cobalt, polyaniline/ferrite cobalt and final ternary composite. The

Abstract Cellulose nanocrystals (CNC)/poly(butylene adipate-co-butylene terephthalate) composites enhanced compatibility with phthalic anhydride were one-step prepared via melt blending. The obtained composites then underwent squeezing treatment in a two-roll milling equipment at a given temperature. CNC/PBAT composites were separated and then tested via FTIR and UV–Vis spectrophotometer. During reactive

Abstract Mullins effect during uniaxial cyclic compression tests, together with its reversibility, of ethylene–acrylic acid copolymer (EAA)/nitrile–butadiene rubber (NBR) thermoplastic vulcanizates (TPVs) were investigated systematically. The results showed that EAA/NBR TPVs had excellent mechanical properties when the weight ratio was 40/60. Morphology studies showed that sphere-like NBR particles

Abstract The blends of ethylene-octene copolymers with octene content of 15 and 3 wt % and ethylene-vinyl acetate copolymer were studied by thermogravimetric analysis, differential scanning calorimetry, atomic force microscopy, and tensile experiments. Thermal behavior reveals that the addition of ethylene-octene copolymer improves the thermal stability of ethylene-vinyl acetate copolymer. Two single

Abstract The process of solid-phase dissolution of polyacrylonitrile copolymer containing ionic sulfo groups in an electron-donating solvent, N-methylmorpholine-N-oxide, is studied depending on its crystal hydrate form and preparation conditions. Optical studies of the transition of solid-phase copolymer–solvent systems to a viscous flow state make it possible to construct solubility curves and reveal

Abstract Silk fibroin (SF) and polyhydroxyalkanoate (PHA) have received increasing attention in recent years because of their unique biodegradability and biocompatibility. Studies on SF or PHA-based materials that are intended for use as biomaterials have attracted great attention, but few studies have been conducted on SF/PHA composite materials. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)

Abstract Attapulgite (ATT) is a naturally rigid reinforcing filler. In this present study, ATT was first purified, and varying amounts of purified ATT was added to polylactic acid (PLA) to modify PLA through a melt-blending technique. The objective was to determine how the content of ATT affected the characteristics of the ensuing PLA/ATT nanocomposites: morphology, mechanical and thermal properties

Abstract New oligomeric compounds containing long aliphatic chains with polar nitrogen-containing terminal groups are successfully used as clay modifiers in a one-step process for producing polymer-aluminosilicate nanocomposites. Polymer-aluminosilicate nanocomposites based on medium density polyethylene containing modifiers of various chemical structures (the length of the modifier aliphatic chain

Abstract The dynamic heterogeneity of polymer chains is characterized by the lower correlation times of its end Kuhn segments with respect to those of the middle segments. In this study, the heterogeneity was investigated using molecular dynamics simulation of freely jointed chains of various lengths in the melt. Our characterization of the segmental dynamics along the chain additionally revealed the

Abstract The influence of the structure of the polymer matrix on the main photoluminescence characteristics of composites based on core (CdSe) and core–shell type (CdSe/ZnS) quantum dots embedded in liquid-crystalline and amorphous polymers of similar chemical structure is studied. The photoluminescence spectra consist of two bands (2.15 and 1.70 eV), the first of which corresponds to the radiative

Abstract— The formation of polyelectrolyte complexes between natural polysaccharides, chitosan and carboxymethyl cellulose sodium salt, in water–ethanol media was studied. It was found that, with an increase in the content of ethanol in the solvent to 50 vol %, the intensity of the Coulomb interactions between oppositely charged groups of polyelectrolytes gradually weakens and, as a consequence, the

Abstract Nanofibers are known as promising carriers for anticancer drug delivery, particularly in postoperative local chemotherapy, through surgical grafting the membrane. In this study, blends of poly (ε‑caprolactone) (PCL) and gelatin (Ge) at various polymeric proportions were used for electrospinning of the nanofibers containing the anticancer drug of 5-Fluorouracil (5-FU). The electrospinning was

Abstract Retrieving information about the molecular motion of polymer chain in melt from the FID is based on the theoretical assumptions in which the heterogeneity of segmental dynamics and its anisotropy along chain are ignored. This article—the second and conclusive in the series—demonstrates, in detail, the FID calculation for various length chains considering these peculiarities revealed in the

Abstract In order to explore the effect of molecular structure on the crystallization and polymorphic behavior of β-nucleated isotactic polypropylene (β-iPP), four commercial iPP samples with different average isotacticities, molecular weights and isotactic distributions were used. The relationship between the molecular structure characteristics and β-crystallization behavior were investigated by means

Abstract Dimethyl amino ethyl methacrylate was grafted onto chitosan using gamma irradiation technique. The grafting (%) was increased with irradiation dose increment. The presences of Cu+2 and Ag+ with different concentrations (1 and 2%) in the properties of composites were examined. The prepared copolymers composites were characterized by FTIR, TGA, SEM, XRD and the electrical conductivity. The TGA

Abstract Plasticizers were added to the polymeric networks to improve the performance of the composite solid propellants. Energetic plasticizers were used to increase the energy content, in addition to improving the glass transition temperature and mechanical properties. The compatibility between polymer and plasticizer is an important criterion for obtaining the best thermomechanical properties. In

Abstract For the well-known theoretical model of hydrodynamic chromatography, which relates the relative retention of an analyte and the separation efficiency to the characteristic parameter of a system, expressions are proposed that make it possible to find the optimal conditions for analysis. The theoretical model well predicts the relative retention of analytes but greatly overestimates the separation

Abstract Using mulberry silkworm pupae as an alternative source of renewable raw materials, a water-soluble Bombyx mori chitosan derivative N-carboxymethylchitosan is synthesized. A method for the photochemical reduction of silver ions into silver nanoparticles in an N-carboxymethylchitosan matrix is developed. The presence of silver nanoparticles in a colloidal solution is confirmed by UV spectroscopy

Abstract The general density functional approach is used to develop a molecular-statistical theory of rod-coil diblock copolymers which is valid in the case of both weak and strong segregation. The free energy of the rod-coil copolymer is expressed as a functional of the number densities of rod and coil monomers which depend on the translational and orientational degrees of freedom. The equilibrium

Abstract Composite materials based on secondary polypropylene and short-chopped basalt fibers are presented. Composites contain from 5 to 20% basalt fibers; each composite is heated at a temperature of 500, 650, and 750°C. For all samples, stress–strain curves are obtained. The tensile modulus reaches 2120 MPa at a basalt fiber content of 20%, while for the initial secondary polypropylene this modulus

Abstract The main purpose of this research work is to synthesize polypyrrole (PPy) and polypyrrole (PPy)-cadmium oxide (CdO) nanocomposites with different concentrations by using in-situ chemical polymerization method. Thin films of the synthesized composites were prepared by doctor blade method. The samples were characterized by XRD technique and four probe method to find the structure and electrical

Abstract The temperature dependence of the glass transition activation energy for amorphous organic polymers and inorganic glasses is calculated using the Williams–Landel–Ferry equation for the relaxation time (viscosity). The results obtained are in satisfactory agreement with the experiment. The nature of the dependence of the glass transition activation energy on the temperature is discussed.

Abstract In this study, polymeric cryogels were synthesized to develop a new methacrylamide-based polymeric material that includes chitosan to remove dyes that may be present as contaminants in aqueous media. Methacrylamide/chitosan (MAmCS) cryogels prepared under cryogenic conditions were characterized by FTIR, SEM/EDX and swelling tests. It was determined that the Langmuir isotherm model, pseudo

Abstract In this study, four types of widely used commercial β-nucleating agents (β-NAs) were used to prepare β-nucleated isotactic polypropylene (β-iPP). Differential scanning calorimetry (DSC), polarizing optical microscopy (PLOM), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to comparatively study the roles of β-NA in the β-nucleation efficiency, isothermal crystallization

Abstract The CsMe/PVA/ZnO nanocomposite hydrogels have been introduced as a new object to deliver drugs, which is dependent on pH. They were prepared successfully in situ by forming of ZnO nanoparticles within swollen CsMe/PVA hydrogels. The resulting hydrogels were examined by running various experimental procedures such as FTIR, XRD, EDX and SEM. XRD and EDX patterns verified the formation of ZnO

Abstract Heating of a multiply protonated poly(ethylene oxide) chain in an intense high-frequency electric field in a vacuum is studied using molecular dynamics simulations. The rate of absorption of the field energy by the chain is determined at the field frequencies from 0.5 to 150 GHz. The absorption spectrum depends on the number of attached protons n, and also on the temperature of the chain.

Abstract— A parametric mode of radiofrequency superradiance was found to emerge upon external exposure of a paramagnetic polymer composite to pulses of elastic waves under high pressure. The composite was a polystyrene matrix containing a system of crossed spins on the basis of Co(QH)2–O–Co(QH)2 or Mn(QH)2–O–Mn(QH)2 binuclear clusters (QH is a ligand based on QH2, 3,6-di-tert-butylpyrocatechol), which

Abstract— Hydrogel is a kind of new functional polymer material with application value and economic benefit. It has wide application in biomedical field because of its good biocompatibility and hydrophilicity.In this work, chitosan hydrogel was prepared by free radical graft copolymerization using natural biodegradable polymer chitosan as the carrier, temperature sensitive N-isopropylacrylamide (NIPAm)

Abstract The influence of polymer-solvent noncovalent interactions on conformational order in macromolecules as a reason behind the structural plasticization of polymers is considered. The films of styrene-n-butyl acrylate copolymers of various microstructure and composition formed from solutions in solvents of different nature (toluene, acetone) are studied by ATR IR spectroscopy and quantum-chemical

Abstract The products of triethanolamine- and triethylamine-catalyzed reactions of etherification of orthophosphoric acid using poly(oxypropylene glycol)-1000 are studied. It is shown that the nature of tertiary amine markedly influences the completeness of the etherification reaction. When using triethanolamine, its hydroxyl groups are also involved in the etherification of orthophosphoric acid. The

Abstract Enhancing on the crystallization ability of poly(L-lactic acid) (PLLA) during practical processing is one of the most effective way to overcome the poor heat resistance. In this work, N,N '-adipic bis(piperonylic acid)dihydrazide (PAAH) was synthesized to be firstly used as a heterogeneous nucleating agent to evaluate its influence on the performances, including the crystallization, melting

Abstract Nanomodified polyetherimide samples obtained by fused deposition modeling using an experimental setup for three-dimensional printing of highly heat-resistant plastics are studied. Their structure and thermal properties are investigated by pycnometry, scanning electron microscopy, differential scanning calorimetry, thermogravimetry, and dilatometry. It is found that the modification of polyetherimide

Abstract Using X-ray diffraction, electron microscopy, and differential scanning calorimetry, the structure and mechanical properties of tubes based on poly (L-lactide) microfibers obtained by electrospinning from a dichloroethane solution and designed for implantation in small diameter blood vessels during prosthetics are studied. It is shown that freshly formed microfibers have an amorphous structure

Abstract Composites of various composition are obtained by the solid-phase mixing of thermoplastic polyesters poly(3-hydroxybutyrate) and polylactide under conditions of shear deformation in the presence of poly(ethylene glycol) as a plasticizer. The thermophysical parameters in primary and secondary heating scans are measured. It is shown that the original polyesters are immiscible polymers. The degree

Abstract The effect of residual secondary structures in peptides and proteins on their separation is considered within the framework of the lattice model of adsorption and chromatography of macromolecules. It is shown that, if the model takes into account secondary structures, such as helices, folds, or crosslinks, the retention volume may change considerably. At the same time, for short peptides with

Abstract The tilted lamellar phase of a symmetric rod–coil diblock copolymer is studied by dissipative particle dynamics simulation over a wide range of degrees of block segregation. The microphase separation in the copolymer and the orientational ordering of rigid blocks in the tilted phase are investigated. For the first time, spatial profiles of the orientational order parameter and the density

Abstract Films obtained from aqueous solutions of chitosan succinamide sodium salt are studied. It is found that the process of water vapor sorption by polymer films proceeds in an anomalous mode and the diffusion coefficients of water and the dioxidine drug in the films depend on the thickness of the samples and the concentration of the polymer in the initial solution. It is assumed that the dependence

Abstract The thermodynamic characteristics of deformation of thermoplastic elastomers obtained by the dynamic vulcanization of two crystallizable components polypropylene and ethylene-propylene-diene copolymer are studied by deformation calorimetry. The entropy and energy effects of deformation are determined for the original, oriented, and annealed (at 70°C) samples containing 20 and 29 wt % polypropylene

Abstract Poly(ethylene terephthalate)/clay nanocomposite multifilament yarn was manufactured by conventional masterbatch approach. Poly(butylene terephthalate) was used as a carrier polymer in masterbatch steps. The masterbatches were diluted into pilot melt spinning machine and subsequently drawn with 2.65 ratios to prepare fully oriented yarn. The degree of dispersion in nanocomposite fibers was

Abstract Phase equilibria in systems polystyrene–block and gradient n-butyl acrylate–styrene copolymers are studied for the first time using optical interferometry for polystyrene of various molecular weight and copolymers of different architecture. Phase diagrams, which are characterized by the upper critical solution temperatures, are constructed. The pair interaction parameters for these systems

Abstract This study focused on the preparation method and evaluation of micro-nano composites based on emulsion polymerization styrene butadiene rubber (ESBR) and kaolinite. A novel method – latex blending was utilized to improve the dispersion of kaolinite in matrix and obtain a semi-exfoliation type clay/polymer composite. The results showed that the kaolinite particles presented a semi-exfoliation

Abstract Magnetoactive elastomers based on polydimethylsiloxane functional oligomers with a concentration of magnetic iron microparticles of 70, 75, and 80 wt % are synthesized. Soft samples with low (about 2 kPa) elastic moduli are obtained by introducing side chains into the polymer network without using a low molecular weight oil. It is shown that the rigidity of the matrix can be controlled by

Abstract The adsorption of poly(acrylic acid) (PAA5K) with negative charge on the highly negatively charged polystyrene sulfate latex (PSL) particles at various ionic strengths were investigated in the present study. The adsorption of PAA was promoted with high ionic strength while the driving forces were mainly controlled by the non-electrostatic interactions including hydrogen bondings, dipole–ions

Abstract The rheological properties of aqueous suspensions of spherical and needle-shaped nanocellulose particles in the range of 25–70°C are compared. Nanocellulose samples are obtained by the acid hydrolysis of cotton cellulose fibers in H2SO4 (61–65%) at 25–45°C. The shape of nanocellulose particles affects the yield strength and non-Newtonian character of the suspension flow. In the shear stress

Abstract— Aqueous solutions of an acrylic copolymer and a low-molecular-weight anionic surfactant are studied using mesoscopic simulation by dissipative particle dynamics. The possibility of formation of a homogeneous film from the acrylic copolymer, where a domain structure is absent and a surfactant is separated from the polymer phase, is studied. A mesoscopic model taking into account the main structural

Abstract— The electron transport is studied experimentally by measuring pulsed radiation-induced conductivity in polyetheleneterephthalate under bulk irradiation of polymer films by fast electron pulses in a small-signal regime. Numerical simulation is performed using a multiple trapping model with an exponential energy trap distribution. It is shown that, contrary to the reported interpretation of

Abstract Microfiltration membranes have been obtained from polymethylpentene by phase separation of its dioctyl sebacate solutions under cooling. The dissolution of the polymer was carried out at its melting point followed by formation of membrane precursors in the form of films from the resulting solution, which were then cooled and washed with acetone to remove the ester and pore formation. Using

Abstract The effect of chitin nanofibrils on the sorption properties of composite films is studied. The value of sorption decreases with an increase in the content of chitin nanofibrils. It is assumed that the introduction of chitin nanofibrils into the chitosan matrix contributes to a denser packing of macromolecules, formation of a more ordered crystalline structure of the composite, and development

Abstract Dilute solutions of nitrile-butadiene rubbers in toluene, methyl acetate, ethyl acetate, and butyl acetate are studied by viscometry. The rubbers are obtained using paraffinate emulsifiers and contain the same amounts of acrylonitrile and different molecular weights. The effect of rubber molecular weight and solvent nature on the intrinsic viscosity [η], viscometric Huggins k' and Kraemer

Abstract The influence of cold rolling on the mechanical characteristics of polypropylene saturated with particles consisting of three to five monolayers of graphene (the degree of filling of 0.2–3.5 wt %) is studied. The nanocomposites are obtained by in situ filling, i.e., synthesis of the polypropylene matrix on the particles, thus allowing more uniform distribution of the filler throughout the

Abstract Using a twin-screw microextruder, fibers are synthesized from polylactide with the addition of two types of chitin nanofibrils—both original and modified with poly(ethylene glycol). The fibers are subjected to the additional high-temperature orientational drawing by a factor of 4 and 6. Composite materials are investigated by a complex of thermophysical and structural methods, and their physicomechanical

Abstract The design of biologically active dosage forms based on chitosan is significantly limited by its insolubility at pH values above 6.0–6.5 and worsening of its gastrointestinal absorption capacity upon transition to neutral and alkaline environmental conditions. The partial acylation of short-chain chitosans with the use of betaine in the presence of a coupling reagent (betaination) allows one

Abstract Using the pulsed molecular acoustics method, the velocity of longitudinal and lateral sound waves in amorphous organic polymers is measured. The elastic moduli and Poisson ratio, as well as the previously introduced effective elastic modulus, are determined. It is shown that for amorphous polymers the ratio of the bulk modulus to the effective elastic modulus is a single-valued function of

Abstract The use of a solvent, Vaseline oil, for the orientational drawing of high-strength and high-modulus UHMWPE fibers is considered. Since the side effect of the residual solvent during orientational drawing of UHMWPE fibers is the formation of pores that reduce the packing density of macromolecules, then at a certain stage of drawing the fiber, the solvent is removed from it by washing in n-heptane

Abstract It is shown that a chitosan coating can be deposited on the pore surface of Celgard polyolefin matrices from aqueous solutions of chitosan saturated with carbon dioxide under high pressure; i.e., when carbonic acid is formed. To ensure the stability of the coating, the initially hydrophobic matrices should be pretreated in the presence of peroxycarbonic acid, which is formed when the aqueous

Abstract The structure of n-butyl acrylate–styrene block and gradient copolymers of various compositions is studied in detail, and their glass transition temperatures are determined. Influence of the architecture of copolymer macromolecules on the glass transition temperature is considered. Histograms of the size distribution of phases are constructed, and the density distribution of domains over the

Abstract It is shown that, in the melts of linear macromolecules, the effects of dynamic heterogeneity associated with the presence of end segments are not vanishingly small in the limit \(N \to \infty \), where \(N\) is the number of Kuhn segments in the macromolecule. The effect has a frequency nature, i.e., the division of the segments into “end” ones, more mobile in comparison with the “median”

Abstract A relaxation model for the structure ripening under annealing of a microphase-separated polymer film has been developed. Equations have been derived that describe the appearance and annihilation of defects in the kinetically controlled mode based on the experimental data on the hexagonal structure evolution. Using that equations, the time dependences of the defect-free area size have been