DEVELOPMENT OF TEXTILE-RUBBER COMPOSITE MATERIALS USING RECYCLED RUBBER AND TEXTILES WITH APPLICATIONS IN INDUSTRY

This paper study methods to obtain composite materials based on recycled rubber from End-of-Life tires and scrap textile. Rubber particles was obtained by industrial shredding procedures and separated by dimension, using sieves. Recycled cotton weave was obtained from scrap cotton textiles. The composite material was produced mixing the recycled rubber powder with a solution of acrylate rubber (AR), (NipolR AR 51) in acetone/ethyl acetate, then coating that composition on a 100% recycled cotton weave. After application, the composite was dried in a dryer with ventilation. The final composite material will be chemical characterized. Attempts will be made to determine whether the composite can be used as isolation material with temperature dissipation characteristics.

Structure/Properties Relationship of Anionically Synthesized Diblock Copolymers “Grafted to” Chemically Modified Graphene

A novel approach to obtaining nanocomposite materials using anionic sequential polymerization and post-synthetic esterification reactions with chemically modified graphene sheets (CMGs) is reported. The anionically synthesized diblock copolymer precursors of the PS-b-PI-OH type were grafted to the chemically modified –COOH groups of the CMGs, giving rise to the final composite materials, namely polystyrene-b-poly(isoprene)-g-CMGs, which exhibited enhanced physicochemical properties. The successful synthesis was determined through multiple molecular characterization techniques together with thermogravimetric analysis for the verification of increased thermal stability, and the structure/properties relationship was justified through transmission electron microscopy. Furthermore, the arrangement of CMGs utilizing lamellar and cylindrical morphologies was studied in order to determine the effect of the loaded CMGs in the adopted topologies.

In-situ synthesis of TiN and TiB2 compounds during reactive spark plasma sintering of BN–Ti composites

A BN-TiB2-TiN composite was produced via reactive sintering of the hexagonal BN (hBN) with 20 wt% Ti. Spark plasma sintering (SPS) was used as the fabrication method and the sample was characterized by X-ray diffractometry, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. According to the results, the Ti was utterly consumed during the SPS, led to the in-situ TiB2 and TiN0.9 formations. Additionally, the microstructural study revealed the nucleation and growth of new hBN platelets from the initial fine hBN particles. Anyway, the final composite reached a relative density of 95%, because of the remaining free spaces between the hBN platelets. It was found that some nitrogen and boron atoms could leave the TiN and TiB2 microstructures, respectively, and diffuse into the opposing phase.

Effect of Friction Stir Process Parameters on Mechanical Properties of Al/Eggshell/SiC Composite Material

The rise in pollution is a serious matter of concern for all nations. Industries are mainly responsible for damaging the balance of the cycle of pollution. In this paper, the mechanical properties of Aluminum have been enhanced by reinforcing it with eggshell wastes and SiC as reinforcement particles. Ball-milling technique has been applied for up to 75 hours for making the densities of Aluminum, Eggshell and SiC equal. The prime focus of this work is to improve the hardness value of Aluminium-based final composite material. Friction Stir Process (FSP) technique has been used to develop the composite and the driving parameters of FSP like rotational speed, transverse speed etc. are optimized with the help of the Box-Behnken Design approach. The optimized value of rotation speed was 966.14 rpm as well as transverse speed was 23.18 mm/min. Hardness and tensile strength of composite developed at an optimum combination of parameters were found to be 72.2 BHN and 194.48 MPa respectively. Results showed that tensile strength and hardness were enhanced by about 44.05% and 64.09% respectively.

The Efficiency of Elemental Geochemistry and Weathering Indices as Tracers in Aeolian Sediment Provenance Fingerprinting

Eight geochemical elements (Al, Ca, Fe, K, Na, Mg, Si, Ti) and 17 associated weathering indices were measured in 34 aeolian source samples and 10 sand dune target sediment samples in three absolute particulate size fractions. For each fraction, three final composite fingerprints (i.e., geochemical elements only, weathering indices only and a combination of the two) for discerning and ascribing the aeolian sediment sources were selected. The Modified MixSIR Bayesian un-mixing model was used to apportion aeolian source contributions using the final composite fingerprints. Regardless of the composite fingerprint used, all results across the different size fractions suggested that the south-eastern alluvial fan is the dominant (average contribution 50.6%, SD 19.0%) source of the sand dune samples, with the western alluvial fan being the second most important (average contribution 38.4%, SD 20.4%) source. Comparisons of the posterior distributions for the predicted source proportions generated using the nine composite fingerprints (three kinds of composite fingerprints*three particle size fractions) showed that the composite fingerprints combining the geochemical elements and weathering indices generated the most powerful source material discrimination. Our results demonstrate the use of weathering indices alongside more conventional elemental geochemistry tracers for investigations into sand dune sediment provenance.

Removal of Lead by Oxidized Graphite

Lead ion adsorption on the surfaces of pristine and oxidized graphite is studied quantitatively using X-ray photoelectron spectroscopy (XPS) and standard electrochemical measurements. The XPS analysis confirmed the oxidation of graphite, yielding a final composite consisting of 15.97% of oxygen and 84.03% of carbon in comparison with the pristine graphite powder consisting of 6.13% oxygen and 93.87% carbon. The adsorption of lead (II) ion was confirmed by the peaks observed at 138 eV and 143.8 eV, associated with the emissions from Pb4f 7/2 and Pb4f 5/2, respectively. The effective concentration of Pb2+ ion and the optimum dosage of oxidized graphite were calculated to be 400 µM and 200 mg, respectively. Adsorption capacity of bare graphite was 41.18%, whereas that of oxidized graphite was 73.3%. The present results show that graphite oxide is a candidate material for the adsorption of Pb2+ ion from water.

Corrosion protection properties of different inhibitors containing PEO/LDHs composite coating on magnesium alloy AZ31

Corrosion inhibitors 2,5-pyridinedicarboxilate (PDC), sodium metavanadate (SMV) and 5-aminosalicylate (AS) were impregnated into porous PEO coatings respectively via vacuuming process, followed by fast sealing treatment in a Ce containing solution. After that layered double hydroxides (LDHs) based nanocontainers were respectively prepared on them via hydrothermal treatment. In frame of this work it was shown, that sealing effect for the pore was provided by formation of new phase CeO2 on the surface of PEO coatings. And, hydrothermal preparation for preparing LDHs leaded obvious changes in structure and thickness of the coatings. In addition, impregnation of inhibitors was in favor of improving LDHs content in final composite coatings. EIS result indicated that AS/Ce-HT specimen exhibited a best corrosion protection.

Hevea Braziliensis Nr Part 2: Potential Commercial Application of Methyl Methacrylated Nr, Heveaplus Mg50 in The Paint and Coating Industries With The Atr Ftir Spectral Analyses of the Final Blend Composite With Acrylate Emulsified Paint

The final composition of the blended Heveaplus MG50 and polyacrylic emulsion paint composition, the depolymerised Heveaplus MG50 latex was mixed with polyacrylic emulsified paint with a minor active pre-dispersed curative agents, other diluent additives and dispersion agents, which was heated up in a steam-batch at 70-80 °C for 25 minute, cool to room-temperature, then the analysis of the final composite material was done using the Bruker ATR FTIR spectroscopy.

Hevea Braziliensis Nr Part 2: Potential Commercial Application of Methyl Methacrylated Nr, Heveaplus Mg50 in The Paint and Coating Industries With The Atr Ftir Spectral Analyses of the Final Blend Composite With Acrylate Emulsified Paint

The final composition of the blended Heveaplus MG50 and polyacrylic emulsion paint composition, the depolymerised Heveaplus MG50 latex was mixed with polyacrylic emulsified paint with a minor active pre-dispersed curative agents, other diluent additives and dispersion agents, which was heated up in a steam-batch at 70-80 °C for 25 minute, cool to room-temperature, then the analysis of the final composite material was done using the Bruker ATR FTIR spectroscopy

Application of Heuristic Modeling in the Development of an Algorithm for Generating a Binary Tree of an Object According to a Technical Drawing

This article presents the problem of developing an algorithm for automated reading of a drawing of an object, consisting of three types with the necessary cuts. According to the drawing, a partition of the object into nonderivative figures should be obtained and boolean operations should be identified, with the help of which the final composite figure will be constructed from non-derivative figures. Thus, in the process of solving this problem, a socalled binary tree of the modeled composite figure will be generated. Moreover, it is necessary to take into account the multiplicativity of the solution to this problem and the possibility of choosing optimal solutions. This paper poses a specific problem, in which non-derivative figures can be got using four formbuilding operations available in the arsenal of tools for getting three-dimensional elements in the Compass 3D geometric modeling system, namely, such operations as "extrusion", "rotation", "along the trajectory" and "cross-sections".