


Том 50, № 4 (2018)
- Год: 2018
- Статей: 22
- URL: https://journal-vniispk.ru/0015-0541/issue/view/14657
Proceedings of the Ivth International Conference “Modern Trends in Polymer Chemistry and Technology Development,” St. Petersburg, 2018
Orientation of Pile in Pile Cover Formation Process on Flocked Material
Аннотация
Concepts of fibre orientation on the surface of flocked material are used to construct a model of pile cover formation. Calculated values of the orientation parameter and its experimental estimates are compared. The possibility of evaluation of the characteristics that determine the orientation of the pile and the process of its application based on measurement of the pile cover density for different flocking durations is shown.



Article
Preparation and Study of Polymer Implants with a Silver Nanocoating
Аннотация
Polymer mesh implants with a nanostructured silver coating were prepared by the chemical reduction of silver ions with and without prior plasmochemical activation of the polymers. We studied the effect of plasmochemical treatment on the amount and size of the reduced silver particles and determined the antimicrobial activity of these samples. The homogeneity of the nanostructured silver coating was evaluated.



Thermooxidative Destruction of Solvent During Production of High-Strength Fibers of Ultrahigh-Molecular Polyethylene (UHMPE) by Gel-Formation Method
Аннотация
Changes in the chemical composition of the solvent (Vaseline oil) as a result of its thermooxidative destruction were detected and investigated by UV and IR spectroscopy. It was found that an absorption band at ~270 nm, corresponding to the chromophoric C=O and C=C groups, appears in the electronic spectrum and increases in intensity during thermal destruction of Vaseline oil while absorption bands at 1720 and 1740 cm-1, due to the appearance of terminal acid and aldehyde groups respectively, appear in the IR spectrum. The kinetics of the accumulation of chromophoric groups in relation to the experimental temperature was investigated, and a correlation was established between the intensity of the color of the solvent and the concentration of chromophoric groups.



Transenergo Plastics Based on Film-Type Composite Materials
Аннотация
Film-type composite materials based on a polypropylene matrix and carbon nanoparticles in various forms (spherical technical carbon and anisotropic carbon nanofibers) were obtained by the melt method. Different types of relationship were found between the electric and thermal conduction and the concentration of the carbon nanofillers. It was shown that with the introduction of carbon nanofibers it is possible to obtain transenergo plastics with simultaneous electroconductive and thermoconductive characteristics. The electroconductivity of the film-type composite materials was modeled in the region of nanofiller contents at and below the threshold for flow of electric current.



Modeling Systemic Tranformations in Carbon-Fiber Production Technology
Аннотация
The basic principles of information modeling are examined as systems engineering technology for producing carbon fibers (CFs) with given properties. The concept of a fiber system is introduced based on general system theory. The fundamental systems of the polymer fiber precursors and CFs based on them are represented as composites. The properties of the produced CFs can be controlled in two ways, i.e., by performing technological transitions during CF preparation as composites and by affecting each of the materials of the technological procedure, including use of the observed effect to change the properties of the polymer fiber—precursor system during its subsequent heat treatment. Information modeling is found to be highly efficient in practice for producing CFs with high electrical conductivity from poly(para-phenylene-1,3,4-oxadiazole).



Morphology and Strength Characteristics of Composites Based on Nanocrystalline Cellulose and Water-Soluble Polymers
Аннотация
The effect of nanocrystalline cellulose (NCC) content on the morphology and strength characteristics of its composites with poly(ethylene oxide) (PEO), polyvinylpyrrolidone (PVP), and their mixture is studied. The miscibility of PEO and PVP improves if NCC is added. Scanning electron microscopy images showed that rearrangement of PEO crystalline regions and sorption of PVP on NCC particles improves the homogeneity of the composite structure and improves the strength characteristics.



Effect of Terminal Hydrophobic Groups on the Behavior of Linear Poly-2-Isopropyl-2-Oxazoline in Aqueous Solution
Аннотация
Light scattering, turbidimetry, and viscosimetry have been used to study aqueous solutions of poly-2-isopropyl-2-oxazolines differing in the structure of their hydrophobic terminal groups. The phase separation temperature was determined. A complex temperature dependence was found for the viscosity of these solutions featuring an inflection point near the phase separation temperature. The addition of polyacrylic acid to a solution of poly-2-isopropyl-2-oxazoline has only a weak effect on the phase transition temperature but has a considerable effect on the viscosity of the system.



Carbon Nanotubes: Properties, Synthesis, and Application
Аннотация
This review describes features of the structure of carbon nanotubes, their principal characteristics, methods of synthesis, and regions of potential application. Most attention has been paid to the use of nanotubes in catalysis. Examples are given of the functionalization of nanotubes and also their use as catalysts, catalytic additives, and catalyst supports.



Monometallic Ru, Au, and Pt Catalysts Deposited on Carbon Nanotubes for Oxidative Steam Reforming of Methanol
Аннотация
The results are presented from investigations into the effect of oxidative treatment of carbon nanotubes on the physicochemical and catalytic characteristics of gold, ruthenium, and platinum catalysts deposited on them. The surface of multiwalled carbon nanotubes was functionalized in an acidified solution of potassium permanganate. The physicochemical characteristics of the carbon nanotubes and deposited catalysts were studied by the following methods: BET (the Brunauer–Emmet–Teller method), TPR-H (temperature-programmed reduction with hydrogen), XPA (x-ray diffraction), Fourier IRS (infrared spectroscopy with Fourier transformation), TGA (thermogravimetric analysis), scanning electron microscopy (SEM), and chemisorptions of CO and H2. The catalytic activity was determined in a flow-type quartz reactor in the range of 250-300°C at atmospheric pressure.



Development of Integral Optimality Criteria for Mathematical Modeling of Relaxation/Recovery Processes in Polymer Textile Materials
Аннотация
Our proposed integral optimality criteria for mathematical modeling of relaxation/recovery processes in polymer textile materials have been developed using integral governing equations of the Boltzmann–Volterra type. Practical realization of our criteria presumes a large number of computations, which is why we need to use modern information technologies for optimal modeling and prediction of the indicated processes.






Preparation and Biological Activity of a New Generation of Collagen Materials
Аннотация
The properties of a dry soluble collagen preparation and medicinal films prepared from it are reported. The method for preparing the soluble collagen preparation is discussed. The bulk density of the starting collagen and the surface density of its films are estimated. Results from mechanical tests and the relaxation properties of films prepared from solutions of the collagen preparation are presented. Medical and technical requirements for medicinal collagen films are drafted. The assembly of multilayered collagen nanostructures is described. Methods for creating molecularly ordered structures by successive deposition of collagen monolayers on a solid substrate are discussed.



Structure and Properties of Composites with Sunken-Loop Knit Fabric Filler
Аннотация
Samples of composites based on epoxy resin and sunken-loop knit fabric with satin and lasting 1+1 interlocking are investigated. It is shown that the strength anisotropy coefficient of the composite can be counted as a double ratio of the knit fabric density along the course to the knit fabric density along the wale. The extensibility of the knit fabric does not have a significant effect on the strength of the composite reinforced by it. The maximum strength of the composite is attained when the loop modulus is above 50. In mechanical properties, composites with a knit fabric filler are close to composites with quasi-continuous reinforcement, for example, with individual unidirectional threads.



Self-Assembly Processes in Aqueous Solutions of Heatsensitive Linear Copolymers Derived from N(Dimethylamino)Ethyl Methacrylate
Аннотация
Light scattering and turbidimetry were used to study self assembly processes of macromolecules of a linear copolymer derived from 2(dimethylamino)ethyl methacrylate in aqueous solution. A sample with molecular mass 24,000 g/mole was studied. A structural phase transition is observed with increasing temperature in solutions of this copolymer. The temperatures for the onset and completion of phase separation as well as the width of this interval increase with decreasing concentration of the copolymer in solution.



Role of the Relaxation State of Polymer Components in Wood When Making Composite Packaging Materials (Corrugated Cardboard)
Аннотация
We consider targeted variation of the relaxation state for polymer components of wood in stages of the life cycle of corrugated cardboard. From the standpoint of the structural physicochemistry of wood, we present a mechanism for the processes occurring in traditional corrugated cardboard production technology. Our thesis is that cellulose and hemicellulose can go from the glassy state to the rubbery (highly elastic) state at 220°C, but under real conditions this transition occurs at room temperature and even at negative temperatures in the case of plasticization by a sufficient amount of water. Transition of lignin from the glassy state to the rubbery state occurs at a temperature above 130°C, and at 70°C-120°C under conditions of sufficient hydration. Formation of strong interfiber bonds is possible only when the polymers forming the contact are in the rubbery or viscous-flow state.



Coloring Heat-Resistant Textiles
Аннотация
The physicochemical properties of aromatic polyamide and polyoxadiazole textile bases are studied. Color-treated Russian heat-resistant fibers and threads are found to have high levels of functionality. The capabilities of coloristic treatment are expanded by using a mixture of organic and mineral dyes.



Preparation and Properties of Organic-Inorganic Composites Based on Hydroxyethyl Cellulose
Аннотация
Hydroxyethyl cellulose is modified with organobentonite particles using mechanical dispersion to produce polymer films. The effect of filler concentration on the structure, strength, and biological activity of the polymer composites was studied.



Influence of the Length and Concentration of Carbon and Glass Fibers on the Properties of Polyphenylene Sulfone
Аннотация
The influence of the length and concentration of carbon (CF) and glass (GF) fibers on the rheological, physicomechanical and thermal properties of high-temperature polyphenylene sulfone thermoplastic with a filler content up to 40% (by mass) was investigated. Carbon and glass fibers 0.2- and 3-mm long were used as fillers. The introduction of CF and GF leads to a noticeable decrease in the melt flow index and the impact strength of polyphenylene sulfone, while the yield stress disappears on the stress-strain diagram, which is caused by a decrease in the material’s ability to plastic deformations. With an increase in the fiber content, the elastic modulus and tensile strength of the composite increase both in bending and in tension. A significant increase in heat resistance occurs with an increase in the CF content, and samples with a CF content of 0.2 mm have a higher mass loss temperature. In the case of composites with GF, there are no significant changes in heat resistance.



Thermochemical and Structural Transformations of Copolyamide Benzimidazole Fibers
Аннотация
The processes of thermal oxidation and carbonization of copolyamide benzimidazole (CPB) fibers were investigated, structural and chemical transformations were characterized by thermogravimetry, IR spectroscopy, elemental analysis, atomic force microscopy, and physicomechanical and electrophysical properties. Fiber hardening was found to occur on treatment at low-temperatures in air. It was shown that the preliminary oxidation of CPB fibers has practically no effect on the carbonization of the polymer. Impedance studies have confirmed that structural chemical modification leads to a decrease in the active resistance of the polymer fiber.



Study of the Mechanical Properties of Polymer Composite Material with Different Structures
Аннотация
We have studied the structure and mechanical properties of composite materials reinforced with carbon fabric. We have evaluated the mechanical properties of the composite materials made. The results obtained demonstrate a way to improve their mechanical properties.



Development of Composite Material Based on Polyphenylene Sulfone for 3D Printing
Аннотация
The effect of talc and various polymer additives on the basic mechanical properties of polyphenylene sulfone was studied. It was found that with an increase in the concentration of the filler, there is an increase in the elastic strength and a decrease in the plastic properties of polyphenylene sulfone. The physicomechanical properties of various polymer-polymer composites based on polyphenylene sulfone are considered. High efficiency of polycarbonate as a modifier of toughness is revealed. An efficient method has been developed for producing a composite with high values of impact strength and modulus of elasticity, based on the characteristics of the distribution of the filler in the polyphenylene sulfone polycarbonate binary system. It is shown that the concentration of the filler in the polycarbonate phase reduces the impact strength, whereas its concentration in the polyphenylene sulfone phase followed by the introduction of polycarbonate results in an impact-resistant and high modulus composite. Samples obtained by the 3D printing method exhibit high mechanical characteristics.



Spectral Analysis of Viscoelastic Creep of Nonwoven Geotextiles
Аннотация
Methods are proposed for mathematical modeling of nonlinear hereditary creep of nonwoven geotextiles based on spectral-time viscoelasticity theory. The procedures for predicting deformation-recovery processes and separation of complete deformation of these materials into individual components are analyzed. Computerization of the developed procedures are proposed.


