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Effect of the Micronization of Pulp Fibers on the Properties of Green Composites
Green composites, composed of bio-based matrices and natural fibers, are a sustainable alternative for composites based on conventional thermoplastics and glass fibers. In this work, micronized bleached Eucalyptus kraft pulp (BEKP) fibers were used as reinforcement in biopolymeric matrices, namely p...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8468071/ https://www.ncbi.nlm.nih.gov/pubmed/34577065 http://dx.doi.org/10.3390/molecules26185594 |
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author | Valente, Bruno F. A. Silvestre, Armando J. D. Neto, Carlos Pascoal Vilela, Carla Freire, Carmen S. R. |
author_facet | Valente, Bruno F. A. Silvestre, Armando J. D. Neto, Carlos Pascoal Vilela, Carla Freire, Carmen S. R. |
author_sort | Valente, Bruno F. A. |
collection | PubMed |
description | Green composites, composed of bio-based matrices and natural fibers, are a sustainable alternative for composites based on conventional thermoplastics and glass fibers. In this work, micronized bleached Eucalyptus kraft pulp (BEKP) fibers were used as reinforcement in biopolymeric matrices, namely poly(lactic acid) (PLA) and poly(hydroxybutyrate) (PHB). The influence of the load and aspect ratio of the mechanically treated microfibers on the morphology, water uptake, melt flowability, and mechanical and thermal properties of the green composites were investigated. Increasing fiber loads raised the tensile and flexural moduli as well as the tensile strength of the composites, while decreasing their elongation at the break and melt flow rate. The reduced aspect ratio of the micronized fibers (in the range from 11.0 to 28.9) improved their embedment in the matrices, particularly for PHB, leading to superior mechanical performance and lower water uptake when compared with the composites with non-micronized pulp fibers. The overall results show that micronization is a simple and sustainable alternative for conventional chemical treatments in the manufacturing of entirely bio-based composites. |
format | Online Article Text |
id | pubmed-8468071 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-84680712021-09-27 Effect of the Micronization of Pulp Fibers on the Properties of Green Composites Valente, Bruno F. A. Silvestre, Armando J. D. Neto, Carlos Pascoal Vilela, Carla Freire, Carmen S. R. Molecules Article Green composites, composed of bio-based matrices and natural fibers, are a sustainable alternative for composites based on conventional thermoplastics and glass fibers. In this work, micronized bleached Eucalyptus kraft pulp (BEKP) fibers were used as reinforcement in biopolymeric matrices, namely poly(lactic acid) (PLA) and poly(hydroxybutyrate) (PHB). The influence of the load and aspect ratio of the mechanically treated microfibers on the morphology, water uptake, melt flowability, and mechanical and thermal properties of the green composites were investigated. Increasing fiber loads raised the tensile and flexural moduli as well as the tensile strength of the composites, while decreasing their elongation at the break and melt flow rate. The reduced aspect ratio of the micronized fibers (in the range from 11.0 to 28.9) improved their embedment in the matrices, particularly for PHB, leading to superior mechanical performance and lower water uptake when compared with the composites with non-micronized pulp fibers. The overall results show that micronization is a simple and sustainable alternative for conventional chemical treatments in the manufacturing of entirely bio-based composites. MDPI 2021-09-15 /pmc/articles/PMC8468071/ /pubmed/34577065 http://dx.doi.org/10.3390/molecules26185594 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Valente, Bruno F. A. Silvestre, Armando J. D. Neto, Carlos Pascoal Vilela, Carla Freire, Carmen S. R. Effect of the Micronization of Pulp Fibers on the Properties of Green Composites |
title | Effect of the Micronization of Pulp Fibers on the Properties of Green Composites |
title_full | Effect of the Micronization of Pulp Fibers on the Properties of Green Composites |
title_fullStr | Effect of the Micronization of Pulp Fibers on the Properties of Green Composites |
title_full_unstemmed | Effect of the Micronization of Pulp Fibers on the Properties of Green Composites |
title_short | Effect of the Micronization of Pulp Fibers on the Properties of Green Composites |
title_sort | effect of the micronization of pulp fibers on the properties of green composites |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8468071/ https://www.ncbi.nlm.nih.gov/pubmed/34577065 http://dx.doi.org/10.3390/molecules26185594 |
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