Papers by Keyword: Polymer Binder

Abstract: This study investigates how feedstock composition affects the performance of 17-4 PH stainless steel (SS) parts produced by fused deposition modeling (FDM). Feedstocks consisted of 91–93 wt.% SS, with varying amounts of polyethylene glycol (PEG), paraffin wax (PW), and stearic acid (SA). Rheological analysis revealed shear-thinning behavior, with viscosity predominantly affected by PEG content at lower metal concentrations and increasingly governed by metal loading at higher concentrations. Thermal debinding confirmed that feedstocks with at least 91 wt.% metal and 3 wt.% PEG maintained structural integrity. Among tested formulations, 93 wt.% SS provided the best print quality, achieving 4.31 g/cm³ density, 1154 MPa flexural modulus, and 5.8 MPa flexural strength. Overall, the results highlight the importance of balancing metal and binder content for optimal FDM outcomes.

Abstract: Functional properties of composite material based on mechanically grinded scrap tires with different particle size of fractioned crumb and polyurethane type polymer binder were investigated to estimate influence of rubber particles size and content on composite material properties (Shore C hardness, compressive stress at 10 % deformation, tensile strength, elastic modulus and elongation at break, apparent density). Optimization possibilities of composite material consisting of rubber particles with different sizes or fractions were investigated. The obtained results show that variation of composition of the composite material by changing size of rubber granulate have definite influence on selected properties of the material. Purposeful selection and mutual combination of rubber particles size included in material can ensure desirable and predictable mechanical properties of composite material.

Abstract: Spectroscopy Fourier Transform Infrared (FTIR) – Attenuated Total Reflectance (ATR) used to study the surface of polymeric materials on polymeric substrates using a sensitive technique for chemical profiling, study of reflection spectroscopy, and a non-invasive. In this study we will investigate of Polytetrafluoroethylene (PTFE) deposition in carbon composite paper without damaging its structure by FTIR-ATR. Carbon composite paper was prepared by mixing the carbon material from coconut fiber and polymer binder in xylen as solvent, casted on glass substrate, and then rolled to make a sheet. Coating process was done by dipped the carbon composite paper in the PTFE suspension with different content of 10 wt%, 20 wt% and 30 wt% for 30 minutes and dried at room temperature for one night and heated at 150°C for 30 minutes, and finally heated at 350°C for 30 minutes to melt the PTFE. All samples were analyzed by using FTIR-ATR and SEM-EDS. Deposition of PTFE with different content in carbon composite papers could be observed by FTIR-ATR. The peaks located at near 1205 cm^-1 and 1154cm^-1 with different intensity for each PTFE contents. FTIR-ATR could be used as a pre-detection method of PTFE deposition in carbon composite paper before using SEM-EDS, because FTIR-ATR would be reflected at the highly reflective surface.

Abstract: This paper gives the information about the dielectric testing of the cement-based composites prepared from a mix of cement mortar and quartz sand, with shredded automobile tires as an admixture, which were intentionally degraded by high-temperature treatment (in the temperature range from 0 °C to 400 °C). The monitoring of structural changes in the thermal stress is very important, for example determining the reliability of the whole structure and influence of polymer admixture on measured dependences. Development of electrical parameters and permittivity at each temperature area reliably shows structural changes and the structural reliability.

Abstract: The present paper deals with the application of impedance spectroscopy method to test cement-based composites after their exposure to high temperatures. A type CEM I Portland cement, siliceous sand and shredded automobile tires were used to prepare mortar specimens. The specimens differentiated in whether or not a 10 % w/w acrylic polymer binder (polymer dispersion 20 % w/w to cement mass) addition to the mortar mixture was used. The specimens were exposed to high temperatures (temperature range: 25-400 °C). Monitoring of structural changes during subjection to thermal stress is an effective way to determine the reliability of specimens structure. Based on Debye's dielectric theory, the specimens were used as dielectric models. Impedance spectra were obtained, while relative permittivity, loss factor and impedance were also measured. The results concerning electrical parameters and permittivity at each temperature were an indicator of the structural changes and its reliability.

Abstract: For the recycling of rapid-cooled steel slag (RCSS), various specimens were prepared with the different replacement ratios of RCSS and the addition ratios of polymer binder. The physical properties of these specimens were then investigated by compressive strength test, flexural strength test, water absorption test, hot water resistance test, measurement of pore distribution and observation of micro-structures using scanning electron microscope(SEM). Results showed that compressive and flexural strength increased with the addition ratios of polymer binder and replacement ratios of RCSS, but those strengths decreased reversely when addition ratio of polymer binder and replacement ratio of RCSS were excessively high. By the hot water resistance test, the compressive strength and flexural strength decreased remarkably and total pore volume increased but bulk density decreased. SEM observation of structure before hot water resistance test revealed very compact infusion of structure but decomposition or thermal degradation appeared in polymer binder when observed after the hot water resistance test.

Abstract: In order to improve the efficiency of high-hardness laser strengthening mold polishing, especially to the free-form surface, a new precision finishing method based on soft-consolidation abrasives pneumatic wheel is brought forward. The pneumatic wheel is constituded by flexible rubber maxtrix, combined with the robbet control. The abrasives group is bond to the rubber matrix by the polymer binder. In the way, compared with those free abrasives used in other polishing method, the soft-consolidation abrasives can get more stable surpport from nearby polymer to form effective cutting. On the other hand, it is unlike the abrasive of rigid grinding wheel because the flexibility of pneumatic wheel can have self-adaptation according to the changes in local curvature and achieve large scale copying contact between tools and work piece. Combined with the lay elastic system theory and Preston equation and coefficients, the mechanics model of polishing is given. The results of experiment shows the Ra of workpiece can be reached to 0.09um and the efficiency of process can be improved three times more than free abrasive machining. It will show its wild prospects in the process of polishing.

Abstract: in order to improve the polishing efficiency to high hardness and high resistance free-form surface of mold, the paper present a new method based on soft-consolidation abrasive pneumatic wheel. The abrasive group is bond to the rubber matrix by the polymer binder. In this way, a flexible pneumatic wheel is formed to get copying contact with the free-form surface for efficient cutting. Combined with the elastic system theory, mechanics model of polishing is found. Scidic silicone sealant is used as the polymer binder, because of its excellent effect of adhesion. The result of experiment shows its wild prospects in the process of polishing.