Papers by Keyword: Polymeric Materials

Abstract: Easy wrap film has been widely used a single use film for dust free storage and COVID 19 prevention during the global pandemic. In the study, natural rubber (NR) latex was chosen as the domestic raw material for a coating application. Sulfur pre-vulcanized NR (PVNR) latex was prepared and purposely planned to be mixed with PVAc-co-PVA (Polyvinyl acetate-co-polyvinyl alcohol) or copolymer as the coating product for the proposed easy wrap film. Role of ratio between polymeric materials in physical, mechanical, thermal and weather resistant properties of the prepared films was elucidated. Ability of spark resistance of the easy wrap film prepared from the polymer mixtures prepared was tested.

Abstract: The Covid-19 virus, which started in 2019 and has taken the whole world under its influence has negatively affected normal living conditions and accordingly, increased awareness to prevent anti-microbial diseases transmitted by contact. In almost all sectors, precautions have been taken considering the transmission of diseases by contact. As a requirement of our age, they enrich their product ranges by developing new methods and making innovations for companies whose sector is dominated by industrial locks, hinges, and handles, both in terms of hygienic product design and in terms of the raw material of the part used in production. For example, it is preferable that the products in the air-conditioning sector have anti-microbial properties. The evaluation of the effect of microorganisms on plastic raw materials and the determination of whether this effect causes future deterioration in plastic materials has been examined in our article. Currently, the products supplied to the sectors are products produced from raw materials such as PA6 GFR30, ABS, PA6, which are available on the market. It is aimed to provide anti-microbial properties of products in accordance with the needs of the sector and the era by changing the raw material used or adding additives in certain proportions to the raw material.

Abstract: Energy saving is one of today’s biggest challenges. Since the construction industry is very energy intensive, there is a question of drastic reduction of energy consumption in all types of buildings. There are different approaches to this issue, but ultimately there is a need to create materials that have high thermal resistance.

Abstract: 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.

Abstract: The paper presents the development of optimum structures and the production of polymeric coatings technology which can absorb aggressive substances. The studies of coatings penetrating into the film are presented due to the organization of their capillary-cellular structure by introducing special fillers. A new approach to solve the problem of protecting the environment, people, buildings and structures from the effects of aggressive substances has been proposed. The essence of the method consists in the preventive deposition on the surfaces of construction objects of porous coatings that can irreversibly absorb aggressive substances. Based on theoretical and experimental studies, porous coatings have been developed that are capable of accumulating in their volume aggressive substances, as well as certain principles of providing the coating with the necessary capillary-porous structure. The mechanism of creating a capillary-cellular structure of a polymer coating based on nitrocellulose are substantiated.

Abstract: Industry 4.0 era, as a whole, when economical entities not need to worry only about the classical business issues like natural disasters, asymmetrical competition, loss of key employees, among others, will be faced with increasingly sophisticated cyber threats targeting critical infrastructure as well as the smart devices that we use to control them virtually. Modern technology is prone to vulnerabilities that can be exploiting to get into targeted networks. Any connected system or industrial robot can easily be scanned for vulnerabilities that can be exploited and lead to the production of defective goods. As a paradox of this society, the future of Polymeric and Composites Materials and of related infrastructure will be based on high degree of automation – despite all associated cyber risks. Moreover, the blue efficiency paradigm will be based on increased role of IT and AI tools that will push the cyber risks even further. The paper will address the cyberspace constraints and corresponding solutions applied to Polymeric and Composites Materials paradigm.

Abstract: The paper focuses on the field of unconventional technologies, specifically on ultrasonic welding of polymeric materials. Ultrasonic welding is one of the well-known techniques of plastic bonding, which significantly reduces the production process. It differs from other welding and connecting processes by the fact that the heat required for joining two plastic materials is obtained solely by mechanical vibrations between the connected parts. The paper aims to assess the strength of the welded specimens and then compare them with the model situation. For experimental welding, polypropylene was chosen. The specimens in the form of standardised test blades were subjected to a tensile test after welding in order to evaluate the effect of the length of the overlapping joint on the final strength of the joint. The resulting weld strength (bearing capacity) was also compared to the strength of the basic material to determine the degree of the strength loss against the basic material.

Abstract: This article deals with the area of non-conventional technologies, in particular results of CO₂ laser micro-machining are the subject of this experimental study. Laser beam and its impact on different types of polymeric materials were studied in details. The aim was to find an optimal combination of laser cutting parameters (power and feed) for ABS, POM, PS, PMMA, PA 6, PA 66, PC, POM, PP, PTFE and PVC. The laser machinability was evaluated with different technological parameters. Next, the Theory of hypothesis testing for evaluation of the laser machinability was applied.

Abstract: The paper deals with possibilities of using the laser in technologies. The parametric temperature field analysis was realized by the finite element method. The analysis was run in COSMOS/M software solver. A thermal module HSTAR makes it possible to realize cases of the temperature dependences on the material properties. Material data can be entered as a function of a temperature. The thermal and physical characteristics of the polymeric materials change significantly. The output of the analysis was described by spectrograms with temperature field distribution of various materials.

Abstract: The mathematical model of heat and mass transfer processes at polymeric material ignition by several metal particles heated to high temperatures was developed. Numerical research of integrated characteristic at the accounting of diffusive and convective heat and mass transfer in the oxidizer during the induction period was executed. Common effect of several local sources with limited power consumption on the main integrated characteristic of process – ignition delay time was established.