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Polymers 2018, 10(7), 766; https://doi.org/10.3390/polym10070766

Application of Melt-Blown Poly(lactic acid) Fibres in Self-Reinforced Composites

Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
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Received: 16 June 2018 / Revised: 10 July 2018 / Accepted: 10 July 2018 / Published: 12 July 2018
(This article belongs to the Special Issue Polymers: Design, Function and Application)
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Abstract

The aim of our research was to produce poly(lactic acid) (PLA) fibres with diameters in the micrometer size range, serving as the reinforcing phase in self-reinforced (SR) PLA composites. Nonwoven PLA mats were manufactured by solvent-free melt-blowing technology. Three types of PLA differing in d-lactide content were processed with a productivity as high as 36 g/h. The crystallinity of the PLA microfibres was enhanced by thermal annealing. A 2–3-fold increase in the degree of crystallinity was obtained, as measured by differential scanning calorimetry (DSC). Fibre diameters between 2–14 µm were revealed by scanning electron microscopy (SEM). Static tensile tests were performed on the nonwoven mats, showing the reduced moduli of the annealed fibres due the amorphous relaxation. The PLA mats were processed via the hot compaction technique and formed into SR–PLA composites. The morphological and mechanical properties of the obtained microstructural composites were comprehensively studied. Composites prepared from annealed, thermally more stable PLA nonwoven mats showed superior mechanical properties; the tensile strength improved by 47% due to the higher residual fibre content. View Full-Text
Keywords: poly(lactic acid); melt-blowing; nonwoven mat; self-reinforcement; thermal annealing; polymer composite poly(lactic acid); melt-blowing; nonwoven mat; self-reinforcement; thermal annealing; polymer composite
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Vadas, D.; Kmetykó, D.; Marosi, G.; Bocz, K. Application of Melt-Blown Poly(lactic acid) Fibres in Self-Reinforced Composites. Polymers 2018, 10, 766.

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