Effect of the Micronization of Pulp Fibers on the Properties of Green Composites
authors Valente, BFA; Silvestre, AJD; Neto, CP; Vilela, C; Freire, CSR
nationality International
journal MOLECULES
author keywords poly(lactic acid); poly(hydroxybutyrate); cellulose fibers; micronization; green composites
keywords POLYLACTIC ACID; NATURAL FIBERS; FLEXURAL PROPERTIES; BIOCOMPOSITES; PLA; PERFORMANCE; WOOD; POLYMER; POLYHYDROXYBUTYRATE; FABRICATION
abstract 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.
publisher MDPI
isbn 1420-3049
year published 2021
volume 26
issue 18
digital object identifier (doi) 10.3390/molecules26185594
web of science category 19
subject category Biochemistry & Molecular Biology; Chemistry, Multidisciplinary
unique article identifier WOS:000701868400001
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journal analysis (jcr 2019):
journal impact factor 3.267
5 year journal impact factor 3.589
category normalized journal impact factor percentile 56.714
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