scholarly journals INFLUENCE OF SHUNGITE ON PERFORMANCE PROPERTIES OF POLYMERIC COMPOSITE MATERIAL

2020 ◽  
pp. 96-105
Author(s):  
N. Klyuchnikova ◽  
A. Piskareva ◽  
K. Urvanov ◽  
S. Gordeev ◽  
I. Genov
Keyword(s):  
Food Industry ◽  
Chemical Resistance ◽  
Natural Fibers ◽  
Polymeric Composite ◽  
Polymeric Materials ◽  
High Strength ◽  
Polymer Materials ◽  
Polymeric Composite Material ◽  
Bactericidal Properties ◽  
Production Technologies

Polymers are increasingly replacing conventional materials such as wood, metals, natural fibers. This is due to a number of advantages of polymer materials over classic ones: increased chemical resistance to aggressive environments, high strength indicators and durability in the operation of products. In addition, polymeric materials are actively used in the food industry. The use of polymer packaging is reaching global proportions. Improving production technologies and formulations allows to create new polymer composites with improved properties, which gives the rapid growth of the polymer industry. In order to impart the necessary properties, fillers are introduced into the polymeric material. By introducing such additives into the polymer, it is possible to control the properties of the material obtained, for example, viscosity, density, transparency, bactericidal and other important properties. The article considers the influence of shungite on the operational properties of the finished composite based on low-pressure polyethylene. The research results showed that the composite obtained provides the highest characteristics with respect to light reflection and absorption for all wavelength regions that are important during operation, has bactericidal properties, and it has been proved that in the shungite-filled polymer, a shift in the temperature of the onset of thermal degradation towards higher temperatures is observed. The composite acquires higher operational and physico-mechanical properties.

Prediction of Deformation Processes of Polymeric Materials Taking into Account Plastic Irreversible Deformation

2021 ◽  
Vol 1022 ◽  
pp. 52-61
Author(s):  
Aleksey V. Demidov ◽  
Avinir G. Makarov ◽  
Nina V. Pereborova
Keyword(s):  
Hollow Structure ◽  
Polymeric Materials ◽  
High Strength ◽  
Textile Yarn ◽  
Polymer Materials ◽  
Prediction Errors ◽  
Synthetic Fibers ◽  
Plastic Component ◽  
Innovative Materials ◽  
Deformation Processes

The need to develop new methods for predicting the properties of polymeric materials is also justified by the goal of designing new innovative materials with the required functional properties and increased competitiveness. The classical methods for predicting deformation processes of polymeric materials are based on the numerical solution of integral constitutive equations for polymer viscoelasticity of the Boltzmann-Volterra type, which do not consider corrections for the irreversibility of the plastic component of deformation and therefore can lead to significant prediction errors. To improve the accuracy of predicting the deformation processes of polymer materials it is proposed to introduce a physically justified correction with account for the irreversibility of the plastic component of deformation. The introduction of this correction significantly increases the reliability and accuracy of predicting the functional and operational properties of polymer materials. The article suggests demonstrating the methods for predicting deformation processes with the example of the polyester textile yarn made of polyester fibers. Unlike many other synthetic fibers, the polyester ones have such important properties as structural stability, softness along with high strength, elasticity, resilience, tensile strength, crease and pilling resistance, temperature regulation, shape retention, etc. The polyester fiber has a hollow structure and its single components have the form of spiral springs which give the effect of a springy base when intertwined.

High-strength fast-curing polymeric composite material

2014 ◽  
Vol 87 (9) ◽  
pp. 1350-1354 ◽  
Author(s):  
V. P. Rybalko ◽  
A. I. Nikityuk ◽  
E. I. Pisarenko ◽  
P. B. D’yachenko ◽  
A. S. Korchmarek ◽  
...  
Keyword(s):  
Composite Material ◽  
Polymeric Composite ◽  
High Strength ◽  
Polymeric Composite Material

scholarly journals Study of the Efficiency of Two Antipyrenes for the Creation of Fireproof Polymeric Composite Materials

2021 ◽  
Vol 320 ◽  
pp. 02002
Author(s):  
Sergey Barbot’ko ◽  
Mikhail Bochenkov ◽  
Oleg Volniy ◽  
Oleg Korobeinichev ◽  
Andrei Shmakov ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Oxygen Index ◽  
Organic Phosphorus ◽  
Total Duration ◽  
Fire Retardant ◽  
Propagation Speed ◽  
Polymeric Composite ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Oxidation Reactions

Most of polymeric materials, when exposed to high temperatures, heat flows or an open flame, are capable of exothermic oxidation reactions – combustion. That is why polymeric materials are fire hazardous. The studies on creating a non-flammable polymer materials are crucial, as such products can make our everyday life a lot more safe. Studies have been carried out to assess the effectiveness of the action of two types of fire retardants (graphene and an organic phosphorus-containing compound DOPO-THPO), introduced into an epoxy resin. Evaluation of the effectiveness of the fire-retardant action was carried out by the methods of oxygen index (OI) and flammability according to UL 94. For the investigated compositions, it was found that there is no direct correlation between the value of the oxygen index and the ability of the samples to maintain self-combustion. For these compositions, the total duration of residual combustion in vertical tests and the speed of flame propagation in horizontal tests are naturally correlated. It was found that if the total duration of combustion of five samples during vertical tests is 500 seconds or less, then these compositions during horizontal tests will fade, that is, formally, their flame propagation speed will be equal to zero.

scholarly journals Nano- and Micro-Modification of Building Reinforcing Bars of Various Types

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 323
Author(s):  
Aleksandr Rudenko ◽  
Alexander Biryukov ◽  
Oleg Kerzhentsev ◽  
Roman Fediuk ◽  
Nikolai Vatin ◽  
...  
Keyword(s):  
Modulus Of Elasticity ◽  
Average Distance ◽  
Polymeric Materials ◽  
High Strength ◽  
Polymer Materials ◽  
Reinforcing Bars ◽  
Nanosized Powders ◽  
Plastic Properties ◽  
Resistance Decrease ◽  
Composite Reinforcement

Fiber-reinforced plastic (FRP) rebar has drawbacks that can limit its scope, such as poor heat resistance, decrease its strength over time, and under the influence of substances with an alkaline medium, as well as the drawback of a low modulus of elasticity and deformation. Thus, the aim of the article is the nano- and micro-modification of building reinforcing bars using FRP rebars made of basalt fibers, which were impregnated with a thermosetting polymer binder with micro- or nanoparticles. The research discusses the major results of the developed composite reinforcement with the addition of micro- and nanosized particles. The microstructure of FRP has been studied using scanning electron microscopy. It was revealed that dispersion-strengthened polymer composites with the inclusion of microsilica (SiO2) and nanosized aluminum oxide (Al2O3) particles have a much higher modulus of elasticity and strength when compared with the original polymer materials. In the course of the experiment, we also studied the retained plastic properties that are characterized by the absence of fragility. However, it was found that the high strength of materials was attained with a particle size of 10–500 nm, evenly distributed in the matrix, with an average distance between particles of 100–500 nm. It was also exhibited that composite reinforcement had improved the adhesion characteristics in comparison with both steel reinforcement (1.5–2 times, depending on the diameter), and with traditional unmodified FRP rebar (about 1.5 times). Thus, the use of micro-/nanosized powders increased the limit of the possible temperature range for the use and application of polymeric materials by almost two times, up to 286–320 °C, which will undoubtedly expand the range of the technological applications of products made of these materials.

A Variational Formulation for the Dynamic Hygrothermoelastic Finite Element Analysis of Mechanical Systems Fabricated With Polymeric Composite Materials

1987 ◽  
Author(s):  
C. K. Sung ◽  
B. S. Thompson ◽  
M. V. Gandi
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Elevated Temperatures ◽  
Mechanical Systems ◽  
Polymeric Composite ◽  
Polymeric Materials ◽  
High Strength ◽  
Superior Performance ◽  
Element Formulation ◽  
High Stiffness

Abstract Many classes of mechanical systems must now be designed with members possessing high stiffness-to-weight ratios and high strength-to-weight ratios in order to achieve superior performance characteristics. One of the philosophies proposed for addressing these classes of problems requires the articulating members to be fabricated with modern composite materials. While these materials enable high-strength, high-stiffness and low-mass members to be fabricated, the properties of these polymeric materials are adversely affected by elevated temperatures and also moisture absorption. The subject of this paper is the development of a methodology for predicting the dynamic hygrothermoelastic response of machine systems fabricated with these advanced materials. This methodology is based on a variational theorem which provides the basis for a finite element formulation. An illustrative example serves to demonstrate some preliminary work on predicting the response of a four-bar linkage fabricated with polymeric composite links simultaneously subjected to both mechanical and hygrothermal loadings.

scholarly journals Antiseptic polymer materials

2019 ◽  
Vol 58 (6) ◽  
pp. 1-18
Author(s):  
Ilgiz Kh. Garaev ◽  
◽  
Ildar N. Musin ◽  
Lyubov A. Zenitova ◽  
◽  
...  
Keyword(s):  
Composite Material ◽  
Chemical Resistance ◽  
Scientific Literature ◽  
Polymer Surface ◽  
Antimicrobial Properties ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Polymer Systems ◽  
Antimicrobial Substances ◽  
Or Groups

The work is devoted to the analysis of information in the domestic and foreign literature on antiseptic polymer materials. Recently, there has been an increased interest in polymeric materials (compositions), which, in addition to the properties inherent in polymeric materials (a combination of elasticity and strength, corrosion and chemical resistance, etc.), have antiseptic properties, i.e. when the polymer exhibits its antimicrobial properties in contact with the polymer surface. The manifestation of antiseptic properties of polymers is possible in the presence of active atoms or groups with antimicrobial properties in the polymer chain itself, as well as in the presence of antimicrobial substances in the composite material as an additional additive. Both methods of creating antiseptic polymer systems are described in the scientific literature. In terms of the volume of messages, the composite (second) method for creating antiseptic polymer composite materials significantly exceeds the synthetic (first) method, since it is simpler and more accessible, both in terms of technology and the availability of components for their creation. Various classes of compounds with antiseptic properties are considered as potential components of antiseptic polymer compositions. The existing terminology used in the field of antiseptic systems is analyzed.

Possibilities of using biodegradable polymeric materials in the agricultural sector

2020 ◽  
Vol 67 (2) ◽  
pp. 115-120
Author(s):  
Raisa A. Alekhina ◽  
Victoriya E. Slavkina ◽  
Yuliya A. Lopatina
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymers ◽  
Biodegradable Polymer ◽  
Agricultural Sector ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Limiting Factors ◽  
Research Purpose ◽  
Biodegradable Materials ◽  
Advantages And Disadvantages

The article presents options for recycling polymers. The use of biodegradable materials is promising. This is a special class of polymers that can decompose under aerobic or anaerobic conditions under the action of microorganisms or enzymes forming natural products such as carbon dioxide, nitrogen, water, biomass, and inorganic salts. (Research purpose) The research purpose is in reviewing biodegradable materials that can be used for the manufacture of products used in agriculture. (Materials and methods) The study are based on open information sources containing information about biodegradable materials. Research methods are collecting, studying and comparative analysis of information. (Results and discussion) The article presents the advantages and disadvantages of biodegradable materials, mechanical properties of the main groups of biodegradable polymers. The article provides a summary list of agricultural products that can be made from biodegradable polymer materials. It was found that products from the general group are widely used in agriculture. Authors have found that products from a special group can only be made from biodegradable polymers with a controlled decomposition period in the soil, their use contributes to increasing the productivity of crops. (Conclusions) It was found that biodegradable polymer materials, along with environmental safety, have mechanical properties that allow them producing products that do not carry significant loads during operation. We have shown that the creation of responsible products (machine parts) from biodegradable polymers requires an increase in their strength properties, which is achievable by creating composites based on them. It was found that the technological complexity of their manufacture and high cost are the limiting factors for the widespread use of biodegradable polymers at this stage.

Flexural behavior of functionally graded polymeric composite beams

2021 ◽  
pp. 152808372110003
Author(s):  
M Atta ◽  
A Abu-Sinna ◽  
S Mousa ◽  
HEM Sallam ◽  
AA Abd-Elhady
Keyword(s):  
Flexural Strength ◽  
Volume Fraction ◽  
Stress Gradient ◽  
Polymeric Composite ◽  
Composite Beams ◽  
Functionally Graded ◽  
Flexural Behavior ◽  
Bending Test ◽  
Polymeric Composite Material ◽  
Fiber Volume

The bending test is one of the most important tests that demonstrates the advantages of functional gradient (FGM) materials, thanks to the stress gradient across the specimen depth. In this research, the flexural response of functionally graded polymeric composite material (FGM) is investigated both experimentally and numerically. Fabricated by a hand lay-up manufacturing technique, the unidirectional glass fiber reinforced epoxy composite composed of ten layers is used in the present investigation. A 3-D finite element simulation is used to predict the flexural strength based on Hashin’s failure criterion. To produce ten layers of FGM beams with different patterns, the fiber volume fraction ( Vf%) ranges from 10% to 50%. A comparison between FGM beams and conventional composite beams having the same average Vf% is made. The experimental results show that the failure of the FGM beams under three points bending loading (3PB) test is initiated from the tensioned layers, and spread to the upper layer. The spreading is followed by delamination accompanied by shear failures. Finally, the FGM beams fail due to crushing in the compression zone. Furthermore, the delamination failure between the layers has a major effect on the rapidity of the final failure of the FGM beams. The present numerical results show that the gradient pattern of FGM beams is a critical parameter for improving their flexural behavior. Otherwise, Vf% of the outer layers of the FGM beams, i.e. Vf% = 30, 40, or 50%, is responsible for improving their flexural strength.

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