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Rheological Master Curves of Crystallizing Polymer Mixtures
We present a simple methodology for extending linear viscoelastic measurements of crystallizing polymers to the high-frequency regime, where usually crystallization kinetics represents an obstacle. The idea is to perform rapid quenches, below the melting temperature (which corresponds to the high-frequency region), ac…
Materials Research - Ibero-american Journal of Materials: judicious, fair and educative!
Production of metallic copper powder by autocatalytic reaction in suspension
The production of metallic powder by precipitation from solution was studied in laboratory scale as an alternative to the conventionally adopted processes, based on the atomization of molten material, for producing metal powders with small particle size. The process is based on the precipitation of metals from aqueous…
Pore structure and carbonation in blended lime-cement pastes
The present study aims to gain a fuller understandingof the curing process in lime pastes (100, 90, 80, 70,60, 50 and 40% lime) blended with cement by analyzingcarbonation in these materials. A hydrated, airslaked lime powder and CEM II A/L 32.5 Portlandcement were used for the blends. These materialswere singled out…
Classification of multi-layered plaster in St. Abbondio Cloister at Como, Italy: an analytical tool for architectural archaeology
St. Abbondio, at Como, Italy, is one of the most outstandingRomanesque basilicas in Northern Italy. Theentire building, and particularly the cloister, has beenthe object of a number of restorations over the centuries,as well as a significant conservation endeavourconducted between 2000 and 2003. In the in-depthdiagnos…
Shear strength of match cast dry joints of precast concrete segmental bridges: proposal for Eurocode 2
This paper discusses a study on the performance of concretesegmental bridges with shear keys, focusing on theshear behaviour of castellated dry joints under ultimatelimit state conditions. The widely varying formulationused to evaluate joint shear strength were compiled,along with the experimental results published in…
Analysis of Shear Deformable Symmetrically Laminated Composite Plates on Elastic Foundation
Characterization by X ray diffraction of mechanically alloyed tripotassium sodium sulfate
Nanocrystalline powder of tripotassium sodium sulfate (K3Na(SO4)2 - KNS) was successfully obtained by mechanical alloying a mixture of potassium sulfate (K2SO4) and sodium sulfate (Na2SO4) with a proportion of 3:1 in a planetary mill. X ray powder diffraction (XRPD) was used to characterize this material. Powders prod…
Disperse Polymer Systems
TABLE OF CONTENTS
Effect of surface deposited rare earth oxide gel characteristics on cyclic oxidation behavior of Fe20-Cr alloys
Rare earths have been used to increase high temperature oxidation resistance of many chromium dioxide and alumina forming alloys. These rare earths can be added as elements (or as oxide dispersions) to the alloys or applied as an oxide coating to the alloy surface. The sol-gel technique is considered to be very effici…
H3PO4/Al2O3 catalysts: characterization and catalytic evaluation of oleic acid conversion to biofuels and biolubricant
Al2O3 and H3PO4/Al2O3 catalysts were investigated in the conversion of oleic acid to biofuels and biolubricant at 1 atm and at 623 K. The catalytic tests were performed in a fixed bed and continuous flow reactor, using an oleic acid-catalyst ratio of 4 and N2 as the carrier gas. The reaction products were analyzed by…
Determination of the optimum composition of adobe brick for a school in Cuba
The present article describes a study conducted to determinethe ideal composition of both traditional and stabilizedadobe as a construction material. The clay soil of avillage in Villa Clara, Cuba, was characterized for its suitabilityto build several adobe structures for a facility forpre-schoolers. Consolidation, si…
Congresos y Seminarios
Prediction of Zero Shear Viscosity of Poly (Vinyl Chloride) Plastisols
Abstract The rheological behaviour of PVC plastisols composed of a blend of suspension and micro-suspension resins in different proportions was investigated. The present work was mainly focused on the variation of the zero shear viscosity versus the concentration of the extender resin. Hence, the packing fraction F m…
Effect of casting temperature and atmosphere on castability of Ni-Cr alloys: a comparative study with direct flame casting method
The purpose of this study was to compare the effect of casting temperature and atmosphere on the castability of three Ni-Cr alloys against direct flame casting method. Vera Bond (VB), Vera Bond 2 (VB2) and Wiron 99 (W99) were cast at three temperatures: VB and VB2 (1310 °C, 1340 °C and 1370 °C); W99 (1400 °C, 1430 °C…
Encapsulation and re-use of wood industry waste: varnish powder
The present article describes the findings of the first stageof the analysis of xiloarcilla, a material made of clayand a wood industry by-product, namely the wood andpolyurethane varnish powder pump-suctioned off woodcomponents during sanding and polishing. This powderwas added to the clay in proportions of from 1% t…