Modeling of the creep behavior of epoxy/yerba-mate residue composites

Abstract

This work presents the short-term creep behavior of novel epoxy composites reinforced by post-consumed yerba-mate (YM). Particulate composites were manufactured using 5, 10, and 20 wt.% of YM. The composite morphologies were related to the dynamic mechanical and creep behavior at the glassy state (∼30°C). Creep tests were performed using three different stress loads (1.5, 3.0, and 6.0 MPa). Weibull model, Artificial Neural Network (ANN) approach and Response Surface Methodology (RSM) were used to fit the experimental curves and to predict results. A better fit was obtained using the ANN approach than the Weibull model due to the capability of ANN to learn from own data and in fitting complex nonlinear data. The RSM approach proved to be an intelligent and reliable technique to access a higher range of results, reducing experimental time and cost and keeping statistical significance. Also, the present methodology can be extended to model and predict other properties and/or optimize parameters.

Aramid pulp modified with imidazolium ionic liquids as a potential replacement for carbon black in fluorinated rubber composites

“…Moreover, the shifting of the damping curves to higher temperatures indicates decreased mobility of the polymer chains, from the addition of fillers, which may be related to the greater interface characteristics. [35][36][37][38] From these results, it is evident that for rubbery compounds, the better interfacial characteristics and/or greater dispersion of fillers into the matrix are not only related to a higher mechanical response, evaluated in quasi-static mechanical tests (such as higher elastic modulus or tensile strength). On the other hand, a full evaluation of viscoelastic response may evidence better the real reinforcement of fillers.…”

Occurrence of filamentous fungi in yerba mate discarded in the environment

“…In the state of Rio Grande do Sul, the per capita consumption is 9kg/year (IBRAMATE, 2018). Due to its high consumption, large amounts of waste are generated and its improper disposal may cause environmental issues and harm wildlife (Neves et al, 2022).…”

“…Despite being a natural organic compound, the waste generated by the consumption of mate does not have an adequate destination yet. Research has been made exploring its potential applications as biodegradable films (Arrieta et al, 2018), as a source of antioxidant phenolic compounds (Gullón et al, 2018), and also in the reinforcement of epoxy-based composite materials (Neves et al, 2022). However, its large-scale reuse is not yet a common reality, and most of the waste generated goes to landfills or home gardens (Gullón et al, 2018).…”