ITEC - Instituto de Tecnologia
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/25
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Navegando ITEC - Instituto de Tecnologia por Assunto "Açaí"
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Item Acesso aberto (Open Access) Comportamento higroscópico do açaí e cupuaçu em pó(2008-12) SILVA, Alessandra Eluan da; SILVA, Luiza Helena Meller da; PENA, Rosinelson da SilvaThe aim of this work was to evaluate experimentally the adsorption and desorption isotherm of açaí (Euterpe oleracea) and cupuaçu (Theobroma grandiflorum) powders using a hygrometer AQUAlab3TE of Decagon. Three levels of temperature (15, 25 and 35 °C) were tested. The type III curves obtained suggest the materials are rich in carbohydrates. Four mathematical models were fitted to the experimental data, Handerson, Oswin, GAB, and modified BET by nonlinear regression analysis using the software STATISTICA for Windows 5.1B. The Oswin and GAB models were better fitted to the açaí and cupuaçu powder sorption data, respectively. The monolayer for açaí and cupuaçu powders was determined. The desorption heat of the açaí powder was also determined.Item Acesso aberto (Open Access) Production and evaluation of recycled polymers from açaí fibers(2010-06) CASTRO, Clívia Danúbia Pinho da Costa; DIAS, Carmen Gilda Barroso Tavares; FARIA, José de Assis FonsecaThe possibility of recycling and the favorable mechanical properties of the products have encouraged the study and production of thermoplastic composites from natural fibrous waste. Açaí (cabbage palm) fiber, which is removed from the seed, has been slightly investigated, as compared to what is already known about the fruit pulp. In this study, the influence of açaí fiber as an element of reinforcement in recycled everyday usage thermoplastics using simple, low cost methodology was evaluated. Recycled matrixes of high impact polystyrene and polypropylene were molded by hot compression from which the fiber composites were obtained. The FTIR technique showed that the process was efficient in preventing degradation of the açaí fibers. The influence of the fiber on the mechanical behavior of the recycled matrixes was investigated by microscopic images of compression and impact tests. The results showed better impact performance for the fiber combined with the polymeric matrixes.