The in situ reactive interfacial compatibilization and properties of polylactide/sisal fiber biocomposites made via melt blending with an epoxy-functionalized terpolymer elastomer were investigated.
The indiscriminate accumulation of waste materials of petrochemical origin has prompted research that leads to obtaining environmentally friendly materials using renewable raw materials. The objective of this thesis was to establish the process conditions for the extraction of microparticles of fique bagasse and the evaluation of the effect of their incorporation in a foamed material obtained from cassava starch.The extraction of the microparticles was carried out by means of a hydrolysis process with sulfuric acid using previously conditioned fique bagasse. To determine the process conditions, a 33 factorial design was run in which the acid concentration (5, 10 and 15%), temperature (70, 80 and 90 ° C) and time (3, 5 and 7h) of hydrolysis, obtaining a significant effect on the morphological, chemical and thermal properties, highlighting functional groups, morphology, color and degradation and melting temperatures characteristic of cellulose, with 10%, 70 ° C and 7h being the conditions that allowed obtaining the smallest size of particle.To determine the effect of the incorporation of the microparticles on the properties of the foams, a unifactorial design was evaluated with five levels of concentration of microparticles (0.0, 0.5, 0.75, 1.0 and 1.25%) in the mixture for obtaining foam, finding a significant effect on the properties of expansion index, density, compressibility and water absorption, being the 0.75% treatment the one that presented outstanding properties with respect to the other treatments. This indicates that fique bagasse in adequate concentrations has potential for use in the production and improvement of the properties of starch-based foams.
In this work, a plant trial was conducted on an industrial low pressure die casting (LPDC) manufacturing process for the production of aluminum alloy wheels. Various types of data have been acquired, including extensive measurements of temperature at different locations (die, wheel and cooling channels), pressure in cooling channels and size/location of shrinkage porosity in the produced wheels. Moreover, two process conditions were tested in the trial—one was the standard production process condition and the other was designed to generate shrinkage porosity in wheels by altering the die temperature. The large amount of quantitative data acquired in this study helped us to understand the key transport phenomena occurring in the process, which include: (1) a thorough picture of the evolution in temperature at a large number of discrete locations in the die and the casting; (2) the dynamic and complicated heat transfer in the cooling channels both water-on and water-off stages, associated with boiling water heat transfer. This paper (Part I) presents the results and findings obtained from the process characterization. The follow-on paper (Part II) will introduce the developed modeling methodology based on the data produced from this work.
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