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Joinville, Brazil

Hamester M.R.R.,Instituto Superior Tupy IST | Balzer P.S.,Instituto Superior Tupy IST | Becker D.,University Estadual Of Santa Catarina Udesc
Materials Research | Year: 2012

There is a high content of calcium carbonate in mussel and oyster shells, which can be used in the formulation of medicine, in construction or as filler in polymer materials. This work has as its main objective to obtain calcium carbonate from mussel and oyster shells and used as filler in polypropylene compared their properties with polypropylene and commercial calcium carbonate composites. The shellfish was milling and heated at 500 °C for 2 hours. The powder obtained from shellfish were characterized by scanning electron microscopy (SEM), X-ray fluorescence, particle size distribution and abrasiveness and compared with commercial CaCO 3 and mixed with polypropylene. The thermal and mechanical properties of polypropylene with CaCO 3 obtained from oyster and mussel shells and with commercial CaCO 3 were analysed. The results showed that CaCO 3 can be obtained from oyster and mussel shell and is technically possible to replace the commercial CaCO 3 for that obtained from the shells of shellfish in polypropylene composites. Source


Efftinga C.,Instituto Superior Tupy IST | Folguerasb M.V.,Santa Catarina State University | Guthsc S.,Federal University of Santa Catarina | Alarconc O.E.,Federal University of Santa Catarina
Materials Research | Year: 2010

Ceramic floor tiles are widely used in buildings. In places where people are bare feet, the thermal sensation of cold or hot depends on the environmental conditions and material properties including its microstructure and crustiness surface. The introduction of the crustiness surface on the ceramic floor tiles interfere in the contact temperature and also it can be an strategy to obtain ceramic tiles more comfortable. In this work, porous ceramic tiles were obtained by pressing an industrial atomized ceramic powder incorporated with refractory raw material (residue from porcelainized stoneware tile polishing) and changing firing temperature. Raw materials and obtained compacted samples were evaluated by chemical analysis, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), thermogravimetric analysis (TGA), and differential thermal analysis (DTA). Thermal (thermal conductivity and effusivity) and physical (porosity) measurements were also evaluated. Source


Kleinschmidt A.C.,Instituto Superior Tupy IST | Balzer P.S.,Instituto Superior Tupy IST | Soldi V.,Federal University of Santa Catarina
Polimeros | Year: 2011

This work analyzed the influence from the sequence of mixture for the composite of polypropylene (PP) with 10% by volume of banana fiber (FB) using maleic anhydride grafted polypropylene (PP-MA) as the coupling agent. The thermal, mechanical, water absorption and morphology of the composites were characterized. Three different sequences were used to mix: the processing of all components together (PP + PP-MA + FB), extrusion of PP / PP-MA and after grinding, the mixture was processed with FB ((PP / PP - MA) + FB), and the mixture of PP-MA with FB followed by extrusion of the composite with PP (PP + (PP-MA + FB)). The composites showed higher thermal stability and lower percent crystallinity than the pure PP, regardless of the sequence of mixing. It was found that the mixture of PP + PP-MA + FB processed once had a higher impact resistance. The composites modified with PP-MA, regardless of the sequence of mixture used, showed higher modulus and lower water absorption than the composite without coupling agent. For the tensile strength and modulus of elasticity no significant changes were observed. The images from scanning electron microscopy indicated that FB had higher adhesion for the composites with PP-MA, especially for composition PP + (PP-MA + FB). Source

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