Environmental, economic, and technical reasons justify research efforts aiming to provide natural materials with possibility of replacing synthetic fiber composites. Commonly known lignocellulosic fibers, such as jute, sisal, flax, hemp, coir, cotton, wood, bamboo have not only been investigated reinforcement polymeric matrices but already applied in automobile components. Less common curaua, henequen, fique, buriti, olive husk, kapok are recently being studied potential owing their...

The exceptional tensile strength of ramie fiber has motivated investigations on its application as reinforcement in polymeric composites. In this study the temperature variation dynamic-mechanical parameters epoxy matrix composites incorporated with up to 30% volume were investigated by DMA tests. storage modulus, loss modulus and tangent delta. investigation was conducted from 20 200°C an equipment operating flexural mode at 1 Hz under nitrogen. results showed that incorporation tends...

The incorporation of calcite marble waste in epoxy resin for the production artificial stone can represent a technical-economical method and environmentally viable, reducing amount discarded residue environment, adding economic value to enabling generation jobs. natural Brazil recorded an exorbitant generated processing. Only 75% taken from deposits it becomes finished product rest is discarded. This study aimed evaluate mechanical physical properties produced based resin. vacuum vibro...

Journal Article Exploring the potential of Burkholderia sacchari to produce polyhydroxyalkanoates Get access T.T. Mendonça, Mendonça Departamento de Microbiologia Instituto Ciências Biomédicas Universidade São Paulo Brasil Search for other works by this author on: Oxford Academic Google Scholar J.G.C. Gomez, Gomez E. Buffoni, Buffoni R.J. Sánchez Rodriguez, Rodriguez Centro e Tecnologia Estadual do Norte Fluminense Campos dos Goytacazes J. Schripsema, Schripsema Grupo Metabolômica M.S.G....

The production of artificial stone from the agglutination epoxy resin fine waste can be a viable alternative technical, economic and ecological points views. residue derives dolomitic marble produced by diamond-plated bladed gang-saws it is usually discarded. With this new application, there value added to residue, reducing consequent environmental impact. main objective research evaluate physical mechanical properties an through vacuum vibro-compression. purpose, plates were produced, using...

Ramie (Boehmeria nivea) fiber is one of several lignocellulosic fibers with superior strength, but the least investigated, particularly as reinforcement in strong, tough polymeric composites. This paper presents mechanical properties for polyester reinforced aligned ramie up to 30% by volume. It was found that adding 30 vol% increases flexural strength about three times (212 ± 12 MPa vs. 63 7 MPa) and tensile a factor two (89 9 53 3 MPa). Polyester-ramie composites also displayed significant...

Nowadays there is an increasing tendency to reuse industrial residues in order reduce their environmental impact. A typical alternative for a residue be incorporate into productive process that could economically viable. In this work, 80 wt% of residues, quarry dust and chamotte from brick industries, were incorporated 20 epoxy resin the production novel artificial ornamental stone used civil construction. For preparation test specimens granulometric composition associated with best...

Graphene oxide (GO) incorporation in natural fiber composites has recently defined a novel class of materials with enhanced properties for applications, including ballistic armors. In the present work, performance 0.5 vol % GO-incorporated epoxy matrix composite reinforced 30 fabric made ramie fibers was investigated by stand-alone tests against threat 0.22 lead projectile. Composite characterization also performed Fourier-transform infrared spectroscopy, thermal analysis and X-ray...

The worldwide demand for ornamental stones in building construction is motivating the use of their wastes, generated during fabrication, to produce synthetic stones. This work has as its objective investigate production a marble (SOM) under vacuum and vibro-compression processing polyester matrix composite with addition waste filler. Rectangular SOM plates were subjected compression flexural mechanical tests. Samples analyzed obtain density, water absorption, microstructure. composites...

This study characterized the mechanical and thermal properties of oligomer‐based formulations diglycidyl ether bisphenol A (DGEBA) cured with series aliphatic amines (triethylenetetramine (TETA), tetraethylenepentamine (TEPA) O,O bis (2‐aminopropyl propylene glycol) (Jeffamine D230) different functionalities in glassy state. Impact Izod three‐point bending tests were conducted to determine networks' impact energy ( E i ), elasticity modulus y yield stress σ ) fracture toughness K IC values....

Compact artificial stones are widely used in buildings around the world, and expected demand to next years is increasing. In this study, stone fragments from marble processing recycled as raw materials for produce compact using compaction a vacuum environment (100 mm Hg). Crushed waste (80 85%wt) mixed with unsaturated polyester resin binder. Materials were processed under pressures of 1 10 MPa, 20 minutes at 90 °C. Artificial flexural ultimate strength 25 water absorption below 0.2%...

The present work is part of an innovation research project aiming to develop artificial stone from industrial wastes. In principle, the goal fabricate stones with improved characteristics be used as plates for housing and road construction. this work, specific residue was electrostatically precipitated powder obtained initial sintering stage integrated steelmaking plant. Plates were produce by vacuum vibro-compression epoxy resin mixed 80 85 wt% residue. After curing, characterized physical...

Brazil is one of the world’s major ornamental stone producers. As a consequence, wastes are generated on large scale and usually open air disposed. Thus, it important to develop novel material reusing these accumulated wastes, aiming minimize environmental impact. The development artificial stones made with agglomerated by synthetic polymer represents an excellent alternative and, therefore, currently subject several works. This work seeks innovative containing 85%wt granite waste 15%wt...

Diamond filled polymeric matrix composites are an attractive issue for wear resistant tools. The performance of these depends on the proper association hard diamond particles and soft matrix. In present work, tensile strength epoxy with 10, 20, 30 wt% was investigated. effect deformability, by changing monomer to hardener ratio, mechanical also evaluated. results showed that composite decreases amount diamond. This behavior attributed development a weak diamond/epoxy interface, as...

Magnetically stabilized fluidized bed reactor (MSFBR) is a sustainable and cost-effective biotechnological process, which justifies the increasing search for biocatalytic superparamagnetic supports to enzyme immobilization. This work, investigates effect of modified nanomagnetite, Fe3O4 (nM), support on properties associated with catalytic behavior potential use in MSFBR. The nM was either synthesized then 3-aminopropyltriethoxysilano (nM-APTES) or oleic acid (nM-OA) later chitosan...