This paper investigates the tribological properties of ultra‐high molecular weight polyethylene (UHMWPE) filled with copper micro‐powder (CMP). The fabrication and testing procedures implemented to characterize strength and wear properties of the composite are discussed. The effect of copper micro‐powder concentration on tensile strength, elongation at break, impact resistance, coefficient of friction, and wear resistance of the composite is investigated. Results show that copper micro‐powder concentration of 1 wt% yields the optimal combination of wear resistance and tensile strength of the composite. A morphological analysis based on scanning electron microscope (SEM) images of the copper micro‐powder‐ultra‐high molecular weight polyethylene specimens is also discussed. The presence of ridges and plaques on the specimens, analyzed after the sliding wear tests, is attributed to fatigue and adhesion mechanisms. Investigations performed by using an electron probe micro‐analyzer provide evidence that the detachment of copper micro‐powder particles from the matrix during sliding wear tests creates a lubricating layer that drastically decreases the coefficient of friction of the composite and improves its wear resistance properties.
Wood and wooden glued products are widely used as building structures in various construction industries that operate within a wide range of atmospheric factors and require stability and durability. Therefore, the goal was to conduct experimental studies to determine the stability of the adhesive bond of a window element made of wood under the influence of temperature and moisture static fluctuations. In this regard, a comprehensive approach was applied to experimentally establish the effectiveness of the glued wood layer by investigating the resistance of the adhesive layer to destruction when changing temperature and humidity fields within a wide range. According to the experimental values of the adhesive layer boundary after exposure to temperature and humidity fields such as glued wood, it was established that the best result of the tensile strength (0.29 N/mm2) was obtained for polyurethane adhesive. For rubber glue and PVA, the tensile strength was 0.17 N/mm2, which provides adhesion quite well due to its properties. This is due to the fact that the adhesive composition must have sufficient elasticity to allow the wood to expand and dry out under the influence of temperature. In turn, the glued layer based on bustilate and liquid glass, has the tensile strength set at a preasure of 0.07 N/mm2 and 0.12 N/mm2 accordingly. A decrease in the adhesive capacity for bustilate is due to the fact that at a low-temperature level, it loses its properties. The liquid glass-based adhesive has an alkaline environment and interacts with the components of wood resin acids, reducing adhesion. The results obtained allow selecting effective adhesives for the production of composite materials from wood, depending on the operating conditions, and provide for the properties of glued wood
Colloidal crystal (CC) fiber has unique light manipulation characteristics, fiber flexibility, and the potential to be used in the textile industry as an alternative to chemical dyes. Introducing polyamide 66 (PA66) into CC fiber can effectively improve the performance of fibers. In this study, polyamide 66 (PA66) CC fibers with various morphologies were fabricated by electrospinning using high-tensile PA66 and P(St-MMA-AA) latex particles as raw materials, such as close-packed, inlaid, noodle-like, spindle knots, bamboo-like, semi-enclosed, hat-like, etc. The formation mechanism of various fibers was analyzed based on the phase separation and assembly interaction. The prepared PA66 CC fiber film was reported to have unique structural color and enhanced mechanical properties, which can be used as a substrate for drawing various patterns. This work will provide a novel idea for the fabrication of functional CC fiber, which is helpful for the potential application in the textile industry.
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