Papers by Keyword: Polyethylene

Abstract: The combination of natural additives with synthetic polymers allows the development of environmentally friendly materials with increased biodegradability. In this article, we investigated composite films based on low density polyethylene (PE) with different content (10-30 wt %) of natural rubber (NR). A mycological test with fungi and a full-scale soil test revealed that the composite with 30 wt% NR was the most biodegradable (weight loss was 7.2 wt % over 90 days). In the experiment on biodegradation in soil, the most intensive development of filamentous fungi was recorded in field tests. However, the rate of weight loss by samples of PLA-LDPE compositions when exposed in natural conditions is significantly lower than the rate of weight loss in laboratory tests. Thus, the present study was carried out to analyse the effect of various additives of biodegradable polymers on biodegradation in soil.

Abstract: The static and cyclic mechanical behavior of samples of composite material with a matrix made of silicone rubber or low-pressure polyethylene reinforced with fibers of titanium nickelide with a martensitic structure has been investigated. It is shown that such composite materials have high deformation cycle resistance.

Abstract: We have obtained polymer composites based on low-pressure polyethylene and carbon-containing fillers: carbon black, carbon nanotubes. The electrical properties of the obtained polymer composites have been investigated. Obtained polymer composites have electrically conductive properties. This article shows that the electrical properties significantly depend on the concentration, type of carbon-containing filler, as well as on temperature and voltage. It was found that containment of a certain amount of carbon-containing fillers leads to a formation of conductive paths composites, leading to the manifestation of a positive temperature coefficient in electrical resistance by the material.

Abstract: The paper presents a comparative analysis of the dynamic loading of a polymethyl methacrylate (PMMA) target by a polyethylene (PE) projectile exposed to laser radiation with similar initial energy characteristics of the projectile and the laser pulse. The similarities and differences in the mechanisms of the target's response and its destruction to high-speed mechanical and laser action are shown. A higher efficiency of laser irradiation in the destruction of PMMA was found, and the conditions for the transition of the fracture mechanism from brittle to elastic-plastic were shown.

Abstract: The features of the dependence of the dielectric constant and the specific volume resistance of the composite "80 wt. % SKI-3 + 20 % wt. % LDPE" from the content of nanosized filler particles - aluminum and black carbon. The use of modern methods for studying macroscopic properties and electron microscopy made it possible to study the structure and morphology of the supramolecular formations of the composite. Models and possible physical mechanisms leading to extreme changes in εʹ and ρ_V at low concentrations of nanoparticles are presented.

Abstract: Представлен оригинальный метод получения композиционных сорбционных материалов на основе смешанных ферроцианидов Ni-K и Zn-K в композиции с силоксан-акрилатной эмульсией и полиэтиленом. Оригинальность метода заключается в гидрофобизации материала за счет введения полиэтиленовых волокон в структуру ферроцианидов. Изучены особенности извлечения микро- и микроконцентраций катионов Cs ⁺ , а также радионуклидов Cs-137 из морской воды в статических и динамических условиях. Экспериментальные значения сорбции аппроксимируются согласно уравнениям Фрейндлиха, Ленгмюра, Ленгмюра-Фрейндлиха, а значения максимальной сорбции G _max и константы адсорбционного равновесия K _lрассчитаны. Установлено, что сорбенты, синтезированные с использованием полиэтилена, при степени очистки морской воды от ионов цезия до 99% обладают наилучшими сорбционными характеристиками. Значения K _p для цезия при использовании исследуемых сорбентов могут достигать 10 ⁵ мл / г, что свидетельствует об их перспективности для очистки морской воды от радиоактивного цезия. Описанный подход является примером простого и доступного технологического синтеза эффективных и востребованных на практике сорбентов высокого эксплуатационного качества.

Abstract: This paper is devoted to the study of the technological process for the production of tape from polyethylene and wood-polymer composite by extrusion. At the first stage, the wood-polymer composite granulate was obtained on a co-rotating twin-screw extruder. The tape was made on a Rheomex 19/25 PolyLab OS single-screw extruder with a barrel length L/D = 25. The processing temperature of the wood-polymer composite was in the range of 145 ... 160°C. The tensile strength and elasticity modulus in tension, water absorption per day and density were investigated for the developed wood-polymer composite and polyethylene. It has been found out that for the developed wood-polymer composite, the strength and elastic modulus along the stretch direction increase by 11% and 6%, respectively. Orientation stretching has a significant effect on the physical and mechanical properties of wood-polymer composites.

Abstract: The work is devoted to the study of the effect of marine calcium carbonate on the polymer matrix. The composite flat strips based on low-density polyethylene filled by crushed shells of sea oysters, which are the main source of sea calcium, were investigated. Marine calcium carbonate masterbatch was used to reduce the cost and stiffen the resulting composite materials. The effect of the masterbatch concentration on mechanical properties and oxidative degradation were studied. The materials were exposed to three climatic factors (temperature, UV-radiation and moisture). The addition of crushed shells led to embrittlement of the test materials. According to FTIR analysis, the absorption band at 1432 cm^-1 attributed to carbonate minerals decreased or completely disappeared after weathering test due to washing out of CaCO₃ from the composite.

Abstract: The purpose of this work is to improve the production technology of biodegradable hybrid compositions based on low-density polyethylene with thermoplastic starch and new plasticizer–distilled monoglyceride and determination of the composition effect on mechanical properties. Starch was plasticized with a mixture of glycerol and distilled monoglycerides, instead of the known sorbitol. This article describes methods for producing biodegradable hybrid composite films based on polyethylene and thermoplastic starches (corn, pea and rice) with a mass ratio of components, respectively, 40:60÷60:40 and their mechanical properties. Properties and structure of composite films are studied using test methods, rheological parameters, optical microscopy, and differential scanning calorimetry. The advantages of using monoglycerides as a plasticizer in thermoplastic starch/ polyethylene compositions have been demonstrated. Composites obtained using distilled monoglycerides and thermoplastic corn, pea and rice starch have been characterized by 62-81% higher values of critical stress and 62-93% elongation at rupture, compared with BHC containing sorbitol. The thickness of biodegradable hybrid composite films with monoglycerides is 55-86% less than that of films containing sorbitol in composition of thermoplastic starch. Higher elongation values at rupture and lower film thickness will ensure more effective destruction in environment and more cost-efficient use in packaging.

Abstract: Previous studies on the physical properties of each Polyethylene (PE) or Ethylene Vinyl Acetate (EVA) foam have been widely reported. The current challenge is how to understand the combination of PE and EVA foam in order to obtain appropriate properties in various applications. Therefore, an experimental breakthrough in order to understand the physical mechanism on the PE:EVA mixed foam in order to maintain many appropriate properties due to their applications was studied. The physical properties of a combination of PE and EVA foam with Azodicarbonamide (ADC) as blowing agent and the addition of Zinc Oxide (ZnO) as accelerated agent in foaming process have been investigated in this study. The foams were prepared via two steps. Firstly, the various content of PE and EVA resins with combination of various content of ZnO and the addition of ADC, stearic acids and antioxidants were mixed by a single screw extrusion as the results of pellets. Furthermore, this intermediate product was pressed by compression moulding at the temperature of 175 °C and pressure of 30 bar for 5 minutes, then the pressure was released for the foaming process. The effect of the addition of ZnO were observed on the density and the mechanical properties of the foams. The density decreased with increasing of ZnO content up to 4 per hundred resin (phr) on the foam with PE content maximum of 20 phr. Interestingly the density of the foam increased with the addition of 6 phr of ZnO. Due to the increasing number of ZnO, we found the formation of foams completely. We observed the approval of the hardness, tensile and compression properties of each formulation, respectively. Furthermore, the morphology observation of the foams was conducted by scanning electron microscopy (SEM) to measure the size and homogeneous of the cells. We observed large size of cells at low density of foams, meanwhile uniform of cell was obtained at the high density of foams. Finally, the Fourier transform infrared (FTIR) spectroscopy confirmed that in general the intensity of the absorption peak at around 2216 cm^-1 - 2223 cm^-1 of each formulation decreased with the addition of ZnO up to 4 phr of ZnO and increased again at 6 phr of ZnO.