Pickering, Kim
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Pickering, Kim
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Pickering, Kim
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Pickering K
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Item-typ:Veröffentlichung, 3D-printed polylactide composites reinforced with short lyocell fibres – Enhanced mechanical properties based on bio-inspired fibre fibrillation and post-print annealingIn this study, 3D printable polylactide (PLA) composites reinforced with 10, 20 and 30 mass% of short lyocell fibres were produced by melt compounding PLA modified with maleic anhydride. Based on bio-inspired anchoring systems, fibrillated fibres were also employed in 30 mass% fibre composites. The resulting 3D printed samples displayed outstanding mechanical performance, particularly with high fibre content. Compared to neat PLA, unmodified formulations showed reduced tensile strength and strain at break with the addition of fibres, but they had a moderate improvement in Young's modulus. However, by combining fibre fibrillation, matrix modification, and post-printing annealing, we achieved an excellent balance of tensile strength (85 MPa), Young's modulus (7.2 GPa), and strain at break (3.2%) - the highest reported values for such composites. Incorporating fibres and increasing PLA crystallinity via heat treatment significantly enhanced the thermo-mechanical stability of the composites, raising the storage modulus up to 38 times at 60 °C and 200 times at 80 °C compared to neat PLA. This combined strategy paves the way for the 3D printing of high-performance structures using 100% bio-derived materials.Wissenschaftlicher ArtikelHeft:7790 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Fibrillation - Improving the fibre/matrix adhesion of lyocell fibres for use in short fibre-reinforced and 3D printed composites(European Society for Composite Materials, 2024-07); ; ; ; This study investigates the influence of fibrillation of lyocell fibres on the mechanical properties of compression moulded polylactide (PLA), polypropylene (PP) composites, and 3D printed PLA composites. Fibrillation was shown to reduce the strength and elongation at break of the fibres without affecting the Young's modulus compared to untreated fibres. Nevertheless, fibrillation in composites resulted in a 1.15 higher strength for PP composites and 1.62 for PLA composites. Young’s modulus and impact strength were increased by factors of 1.41 and 1.38 for PP composites and 1.2 and 1.23 for PLA composites. Applying the fibrillated fibres in 3D printed PLA shows a significant increase in the mechanical properties. For example, with a fibre mass fraction of 30%, the tensile strength of the composites with fibrillated fibres was increased by a factor of 1.18 compared to composites with untreated fibres. The use of maleic anhydride in the PLA matrix in combination with composite heat treatment further increased the strength by a factor of 1.46. With a strength of 85 MPa, a Young's modulus of 7.2 GPa and an elongation at break of 3.2%, these are some of the highest values reported for this kind of 3D printed materials.Wissenschaftlicher ArtikelHeft:254