The Production of biocomposite materials from pretreated pineapple leaf fibers.
The research project was focused on the utilization of pineapple leaf fiber (PALF) for the production of biodegradable composites as a sustainable waste management alternative to replace the existing methods which hold enormous environmental and health implications. Pineapple fiber was extracted from the pineapple and subjected to different treatments in order to remove impurities like hemicellulose and lignin. One of the treatments was the immersion of the PALF in acetone solutions, each with a different concentration (1 %, 3 %, and 5 %) for a time interval of 6 h, 12 h and 24 h. The second method was the pressurized-treatment of PALF in an autoclave at a temperature of 121 °C at a pressure of 15 psi for time intervals of 10, 20, 30 and 45 min. The physical properties of the treated PALF (tensile strength, color change and % of elongation) were analyzed in order to optimize the treatment for industrial PALF production. The acetone treatments 1 % - 24 h and 5 % - 12 h demonstrated the best fiber color change with the highest ΔE values of 13.10 and 11.85 respectively. The PALF acetone treatment 3 % - 6 h, showed the highest tensile strength of (1384.81 ± 391.68) MPa while the PALF treatment 1 % - 6 h had the least tensile strength of (372.27 ± 134.79) MPa. The maximum % of elongation of 2.69 % was observed in the PALF acetone treatment 3 % - 12 h while treatment 5 % - 24 h showed the lowest % of elongation of 0.73 %. By using the treated PALF, reinforced concrete blocks and PALF-resin boards were developed and their physical properties were studied. The PALF reinforced concrete block was made with 3 different proportions of PALF-concrete mixtures such as 10 g/500 ml, 20 g/500 ml and 40 g/500 ml (grams of fiber per 500 ml of concrete). The concrete block 10 g/500 ml showed the highest average flexural strength of (3.13 ± 0.24) MPa while 40 g/500 ml showed the lowest average flexural strength of (0.9 ± 0.32) MPa. The PALF-resin board was made by mixing different volumes of polyurethane resin (60 ml and 120 ml) in 100 g of PALF and subsequently subjected to compression using a hydraulic press at a pressure of 1500 psi for 4 h. The PALF-resin board demonstrated an average flexural strength of (59.33 ± 2.57) MPa.
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| Format: | info:eu-repo/semantics/bachelorThesis biblioteca |
| Language: | eng |
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Universidad EARTH
2017-12
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| Subjects: | BIODEGRADACION, RESIDUOS DE COSECHAS, PIÑA, MANEJO DE DESECHOS, https://purl.org/pe-repo/ocde/ford#4.01.01, |
| Online Access: | https://repositorio.earth.ac.cr/handle/UEARTH/423 |
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