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Pirassununga, Brazil

Guimaraes B.M.G.,Av. Duque de Caxias Norte | Marin D.C.,Carrer de Colom 15 | Zonatti W.F.,Av. Arlindo Bettio 1000 | Mantovani W.,Av. Arlindo Bettio 1000 | And 4 more authors.
Key Engineering Materials | Year: 2016

The employ of vegetal fibers for textiles and composites represents a great potential in economic and social sustainable development. Some Malvaceae species are considered tropical cosmopolitans, such as from Sida genus. Several species of this genus provide excellent textile bast fibers, which are very similar in qualities to the jute textile fiber. The objective of the present study is present the physicochemical characterization of six Brazilian vegetal fibers: Sida rhombifolia L.; Sida carpinifolia L. f.; Sidastrum paniculatum (L.) Fryxell; Sida cordifolia L.; Malvastrum coromandelianum (L.) Gurck; Wissadula subpeltata (Kuntze) R.E.Fries. Respectively the two first species are from Brazilian Atlantic Forest biome and the four remaining from Brazilian Cerrado biome, despite of present in other regions of the planet. The stems of these species were retted in water at 37oC for 20 days. The fibers were tested in order to determine tensile rupture strength, tenacity, elongation, Young's modulus, cross microscopic structure, Scanning Electronic Microscopy (SEM), regain, combustion, acid, alkali, organic solvent and cellulase effects, pH of the aqueous extract, Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). The obtained values were compared with those from fibers of recognized applicability in the textile industry including hemp. The results are promising in terms of their employment in thermoset and thermoplastic medium resistance composites. © (2016) Trans Tech Publications, Switzerland. Source


Cravo J.C.M.,Av. Duque de Caxias Norte | Sartori D.L.,Av. Duque de Caxias Norte | Fiorelli J.,Av. Duque de Caxias Norte | Balieiro J.C.C.,Av. Duque de Caxias Norte | Savastano Junior H.,Av. Duque de Caxias Norte
Ciencia Florestal | Year: 2015

The present study aimed to develop particleboards of low density with peanut shell, coconut husk fiber green (hybrid) and two-component polyurethane resin based on castor oil. The experimental panels were manufactured with particles up to 8mm and 15% polyurethane resin. The pressing was carried out at 5.0 MPa for 10 minutes at 100°C of temperature. The physical-mechanical properties of the material were determined as recommended by ABNT 14810:2006. The results demonstrated a mechanical performance that meets the recommendations established by normative ANSI A208.1-1999 and ABNT 14.810-2:2006. © 2015, Universidade Federal de Santa Maria. All rights reserved. Source

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