Soda-Treated Sisal/Polypropylene Composites |
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Authors: | Maria T B Pimenta Antonio J F Carvalho Fabiola Vilaseca Jordi Girones Joan P López Pere Mutjé Antonio A S Curvelo |
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Institution: | 1.Instituto de Química de S?o Carlos,Universidade de S?o Paulo,Sao Carlos,Brazil;2.Universidade Federal de S?o Carlos,Sorocaba,Brazil;3.Escola Politècnica Superior,Universitat de Girona,Girona,Spain |
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Abstract: | Treated sisal fibers were used as reinforcement of polypropylene (PP) composites, with maleic anhydride-grafted PP (MAPP)
as coupling agent. The composites were made by melting processing of PP with the fiber in a heated roller followed by multiple
extrusions in a single-screw extruder. Injection molded specimens were produced for the characterization of the material.
In order to improve the adhesion between fiber and matrix and to eliminate odorous substances, sisal fibers were treated with
boiling water and with NaOH solutions at 3 and 10 wt.%. The mechanical properties of the composites were assessed by tensile,
bend and impact tests. Additionally, the morphology of the composites and the adhesion at he fiber–matrix interface were analyzed
by SEM. The fiber treatment led to very light and odorless materials, with yields of 95, 74 and 62 wt.% for treatments with
hot water, 3 and 10 wt.% soda solution respectively. Fiber treatment caused an appreciable change in fiber characteristics,
yet the mechanical properties under tensile and flexural tests were not influenced by that treatment. Only the impact strength
increased in the composites with alkali-treated sisal fibers. |
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Keywords: | Composite Natural fiber Polypropylene Sisal Lignin |
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