O objetivo desta pesquisa foi avaliar o reforço de fibras de bambu em compósitos poliméricos. Para tanto, o bambu da espécie (DENDROCALAMUS STRICTUS) foi processado em moinho de martelos e peneirado. Após a caracterização "in natura", os corpos de prova foram conformados em prensa a partir de dois tratamentos, 100% polipropileno e 80% polipropileno / 20% fibras de bambu, e testados mecanicamente por dobra em máquina de ensaio universal. Os resultados da caracterização das fibras indicaram propriedades químicas compatíveis com os valores publicados na literatura, além de resultados de densidade consideravelmente superiores. Por outro lado, os valores do módulo de elasticidade e de ruptura decorrentes dos ensaios mecânicos dos compósitos não apresentaram diferenças estatísticas entre os tratamentos analisados.
The objective of this study is to evaluate the characteristics of polymeric composites containing different bean residue levels for polymer replacement. To this end, agricultural residues were first reduced to particles and characterized "in natura" through tests for moisture content, bulk density, content of extractives, lignin and ash and by thermogravimetry technique. Then, particles of both materials were dried and selected based on their granulometric fractions to make low-density polyethylene (LDPE) composites with substitution levels of 0, 10, 20, 30 and 40% bean residues. The polymeric material and the bean stem and pod particles were hot-extruded to obtain strands and then pellets; the resulting materials were then molded and hot-pressed. After fabrication, the specimens were subjected to physical testing for humidity, density, water absorption, and flammability and to mechanical testing for tensile strength. Scanning electron microscopy (SEM) was performed to evaluate the fracture regions of the specimens that were broken during mechanical testing. The results indicated that the physical–mechanical properties of the composites were negatively affected by the characteristics of the lignocellulosic material and by the increased number of pores caused by the presence of the waste material.
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