Effect of different surface treatments on polypropylene composites reinforced with yerba mate fibers: Physical,mechanical, chemical,and morphological properties |
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Authors: | Cleide Borsoi Betina Hansen Ruan Ezequiel Gemmer Marcos Aurélio Dahlem Júnior Edson Luiz Francisquetti Ademir José Zattera Ruth Marlene Campomanes Santana André Luis Catto |
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Affiliation: | 1. Centro de Ciências Exatas e Tecnológicas, Universidade do Vale do Taquari – Univates, Lajeado, Brazil;2. Universidade Federal do Rio Grande do Sul – UFRGS, Escola de Engenharia, Laboratório de Materiais Poliméricos – LAPOL, Porto Alegre, Brazil;3. Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul – IFRS, Farroupilha, Brazil;4. Universidade de Caxias do Sul – UCS, Programa de Pós-Graduação em Engenharia de Processos e Tecnologias (PGEPROTEC), Caxias do Sul, Brazil |
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Abstract: | This study presents the preparation of post-consumer polypropylene (r-PP) composites filled with 30 wt% yerba mate (YM) stick particles. To improve the fiber–matrix adhesion, three surface treatments were performed: alkaline treatment with sodium hydroxide (NaOH) and use of 3-aminopropyltriethoxysilane (APTS) and maleic anhydride graft polypropylene copolymer (PP-g-MA) as coupling agents. Mechanical properties including tensile, flexural, and impact resistance were determined, and chemical (Fourier transform infrared spectroscopy [FTIR]), physical (water absorption), and morphological analyses were performed. The main findings show that the treatments were efficient in improving the mechanical properties of the composites, with emphasis on the r-PP/YM30/APTS and r-PP/YM30/PP-g-MA composites, which proved to be superior in tensile, flexion and impact strength and absorption of water compared to the untreated composite. The morphological analysis showed a better interaction between the fiber and the polymeric matrix for the composites with YM/APTS and YM/PP-g-MA, which corroborates the results of tensile and flexural strength, as well as with the spectra of FTIR in which the chemical modification of the fibers is observed. However, the results show that these treatments are promising in obtaining composites with recycled matrix with better properties. |
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Keywords: | composites fibers mechanical properties polyolefins thermoplastics |
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