Influence of Carbon Black Content on the Properties of Butadiene Elastomer

В работе приведены результаты исследования физико- механических свойств до и после термического старения, степени набухания в гидравлическом масле, а также температурные свойства эластомеров на основе бутадиенового каучука марки СКД-В в зависимости от содержания малоактивного печного технического углерода марки П‑803. С увеличением содержания технического углерода до 110 масс.ч. в эластомерной матрице происходит повышение относительного удлинения и условной прочности на разрыв, с дальнейшим увеличением содержания наблюдается снижение. С увеличением содержания технического углерода в резиновой смеси показатели плотности, твердости, условного напряжения и агрессивостойкости повышаются. После испытания на термическое старение наблюдается повышение плотности, твердости и условного напряжения, а относительное удлинение и предел прочности при разрыве снижаются. При помощи термомеханического анализатора установлено, что увеличение количества содержания технического углерода в резиновой смеси не оказывает существенного влияния на начало сегментальной подвижности эластомеров, но снижает изменение линейных размеров при повышении температуры. Методом дифференциально сканирующей калориметрии установлено, что изменение количества содержания технического углерода не влияет на среднюю температуру стеклования. При оптимальном содержании технического углерода наблюдается наиболее равномерное распределение частиц в объеме эластомерной матрицы без образования большого количества агломератов либо пустотThe paper presents the results of a study of physical and mechanical properties before and after thermal aging, aggressiveness, as well as the temperature properties of elastomers based on butadiene rubber grade SKD-V, depending on the content of low-activity furnace carbon grade P‑803. With an increase in the content of carbon black up to 110 wt.h. in the elastomeric matrix, an increase in relative elongation and conditional tensile strength occurs, with a further increase in the content, a decrease is observed. The results obtained after thermal aging of samples and their soaking in AMG‑10 hydraulic oil are considered. With an increase in the content of carbon black in the rubber compound, the indicators of density, hardness, conditional stress and aggressiveness increase. After the thermal aging test, an increase in density, hardness and nominal stress is observed, and the elongation and tensile strength decrease. Changing the amount of carbon black in the rubber mixture does not affect the beginning of the segmental mobility of the elastomer, but there is a decrease in the linear-temperature expansion of the samples. Using differential scanning calorimetry, it was found that a change in the amount of carbon black does not affect the glass transition temperature. Using electron microscopy, it was shown that at the optimum content of carbon black, the most uniform distribution of particles occurs in the volume of the elastomeric matrix without the formation of a large number of agglomerates or void

Surface Treatment of Carbon Fiber Reinforcement to Increase Adhesion with Butadiene Elastomer

В работе приводятся результаты исследования увеличения адгезионного взаимодействия бутадиенового эластомера с армирующей тканью на основе углеволокна. Повышения адгезии эластомера с углеволокном добивались путем поверхностной обработки армирующей ткани, растворенной резиновой смесью в толуоле и клеем Хемосил. В результате исследования высокомодульных материалов на расслоение эластомера от углеволокна наблюдается повышение прочности адгезии. При обработке хемосилом армирующей ткани разрушение происходит по эластомеру, прочность соединения с углеволокном превышает когезионную прочность эластомера. Увеличение адгезии между армирующим наполнителем и бутадиеновой матрицей приводит к изменению упругопрочностных свойств полученных высокомодульных материалов, происходит увеличение прочности при разрыве, твердости, снижение относительного удлинения и абразивостойкости. Методом электронной микроскопии установлено, что поверхностная обработка углеткани приводит к образованию плотного контакта с эластомерной матрицей. При помощи термомеханического анализа показано, что данные материалы могут эксплуатироваться при отрицательных температурахThis study presents the results of the study of increasing the adhesive interaction of butadiene elastomer with the reinforcing fabric based on carbon fiber. Increased adhesion of elastomer with carbon fiber was achieved by surface treatment of reinforcing fabric with dissolved rubber mixture in toluene and Chemosil adhesive mixture. Examination of high-modulus materials for delamination of elastomer from carbon fiber showed an increase in adhesion strength. When a reinforcing fabric is treated with Chemosil adhesive mixture, the destruction occurs over the elastomer, the bond strength to the carbon fiber exceeds the cohesive strength of the elastomer. Increase of adhesion between reinforcing filler and butadiene matrix leads to change of elastic and strength properties of obtained high-modulus materials: increase of tensile strength and hardness, decrease of relative elongation and abrasion resistance. The method of electron microscopy has established that the surface treatment of carbon fabric leads to the formation of a dense contact with the elastomeric matrix. Thermomechanical analysis shows that these materials can be operated at negative temperature

Mechanical and Tribological Properties of Polytetrafluoroethylene Modified with Combined Fillers: Carbon Fibers, Zirconium Dioxide, Silicon Dioxide and Boron Nitride

The introduction of combined fillers can effectively improve the mechanical and tribological properties of polytetrafluoroethylene (PTFE). In this work, three different types of nanosized fillers (zirconium dioxide, silicon dioxide, and boron nitride) were introduced in a carbon fiber-reinforced polymer matrix for the development of polymer composite materials (PCM). Tensile and compressive testing were carried out, and the hardness of created PCM was evaluated. It is shown that the compressive strength of PCM increased by 30–70%, and the hardness, increased by 38–55% compared to the initial PTFE. The tribological properties of the developed PCM were evaluated under dry friction conditions. An analysis of the results of an experimental study of wear confirmed that the inclusion of combined fillers (two- and three-component) in PTFE significantly increased wear resistance compared to the polymer matrix with a slight increase in the coefficient of friction. It has been shown that the introduction of three-component fillers has an antagonistic effect on the wear resistance of PCMs compared to two-component fillers. The thermodynamic properties of the composites were analyzed by differential scanning calorimetry and a thermomechanical analyzer. The surface morphology of polymer composites after wear testing was studied by IR spectroscopy and scanning electron microscopy to investigate and suggest a possible mechanism for increasing the wear resistance of the developed composites

A Study of the Wear Mechanism of Composites Modified with Silicate Filler

The article considers the effect of a filler based on synthetic wollastonite (CaSiO3), which is introduced into a polymer matrix made of ultra-high molecular weight polyethylene, on the tribotechnical parameters of the produced polymer composite material. Behavioral features of composites after friction were investigated by infrared spectroscopy and scanning electron microscopy. It was found that the introduction of wollastonite into the polymer matrix contributed to a reduction in the friction coefficient by 23% and the wear rate by four times. In the micrographs of the friction surfaces of the obtained composite, the formation of new secondary structures oriented along the friction direction, different from the initial polymer matrix, was revealed. The presence of wear products (oxidized polymer groups) and CaSiO3 on the friction surfaces was recorded by infrared spectroscopy. It was established that the synthesized CaSiO3 particles were deformed under the action of shear forces and participated in tribochemical processes

A Study of the Wear Mechanism of Composites Modified with Silicate Filler

The article considers the effect of a filler based on synthetic wollastonite (CaSiO3), which is introduced into a polymer matrix made of ultra-high molecular weight polyethylene, on the tribotechnical parameters of the produced polymer composite material. Behavioral features of composites after friction were investigated by infrared spectroscopy and scanning electron microscopy. It was found that the introduction of wollastonite into the polymer matrix contributed to a reduction in the friction coefficient by 23% and the wear rate by four times. In the micrographs of the friction surfaces of the obtained composite, the formation of new secondary structures oriented along the friction direction, different from the initial polymer matrix, was revealed. The presence of wear products (oxidized polymer groups) and CaSiO3 on the friction surfaces was recorded by infrared spectroscopy. It was established that the synthesized CaSiO3 particles were deformed under the action of shear forces and participated in tribochemical processes

Two-Layer Rubber-Based Composite Material and UHMWPE with High Wear Resistance

The aim of the study is the development of two-layer materials based on ultra-high-molecular-weight polyethylene (UHMWPE) and isoprene rubber (IR) depending on the vulcanization accelerators (2-mercaptobenzothiazole (MBT), diphenylguanidine (DPG), and tetramethylthiuram disulfide (TMTD)). The article presents the study of the influence of these accelerators on the properties and structure of UHMWPE. It is shown that the use of accelerators to modify UHMWPE leads to an increase in tensile strength of 28–53%, a relative elongation at fracture of 7–23%, and wear resistance of three times compared to the original UHMWPE. It has been determined that the introduction of selected vulcanization accelerators into UHMWPE leads to an increase in adhesion between the polymer and rubber. The study of the interfacial boundary of a two-layer material with scanning electron microscopy (SEM) and infrared spectroscopy (FTIR) showed that the structure is characterized by the presence of UHMWPE fibrils localized in the rubber material due to mechanical adhesion

Proceedings Of The 23Rd Paediatric Rheumatology European Society Congress: Part Two

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