Abstract
In this work we determine the physical and mechanical properties of local composites reinforced with papaya trunk fibers (FTP) on one hand and particles of the hulls of the kernels of the garlic (PCNFA) in the other hand. The samples are produced according to BSI 2782 standards; by combining fibers and untreated to polyester matrix following the contact molding method. We notice that the long fibers of papaya trunks improve the tensile/compression characteristics of composites by 45.44% compared to pure polyester; while the short fibers improve the flexural strength of composites by 62.30% compared to pure polyester. Furthermore, adding fibers decreases the density of the final composite material and the rate of water absorption increases with the size of the fibers. As regards composite materials with particle reinforcement from the cores of the winged fruits, the particle size (fine ≤ 800 μm and large ≤ 1.6 mm) has no influence on the Young’s modulus and on the rate of water absorption. On the other hand, fine particles improve the flexural strength of composite materials by 53.08% compared to pure polyester; fine particles increase the density by 19% compared to the density of pure polyester.
Highlights
The need of new materials is a permanent concern in many industrial sectors
We notice that the long fibers of papaya trunks improve the tensile/compression characteristics of composites by 45.44% compared to pure polyester; while the short fibers improve the flexural strength of composites by 62.30% compared to pure polyester
Adding fibers decreases the density of the final composite material and the rate of water absorption increases with the size of the fibers
Summary
The need of new materials is a permanent concern in many industrial sectors. Environmental protection being a global concern, the integrating new ecological materials is a necessity. Synthetic fibers are largely dominant in the industrial sector. Their use raises many problems due to the emission of harmful compounds and a high production energy [1]. As the current recycling of synthetic fiber composites has offered no ecological solution, the use of natural reinforced composites seems/proves to be an alternative for environmental protection [5]. The study on the unsaturated polyester/doum palm fiber composite shows that the nature, morphology, arrangement and type of the fibers play a major role in the absorption phenomena of the composite. The present work aims to valorize the waste of local agriculture through the exploitation of fibers (papaya trunks) and stones (the winged fruits)
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