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Article

Fibre Individualisation and Mechanical Properties of a Flax-PLA Non-Woven Composite Following Physical Pre-Treatments

1
Biopolymères Interactions Assemblages (BIA), INRA, Rue de la Géraudière, F-44316 Nantes, France
2
Research Institute Dupuy De Lôme (IRDL), University Bretagne Sud, UMR CNRS 6027, F-56100 Lorient, France
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Unité de Chimie Environnementale et Interactions sur le Vivant, Littoral Côte d’Opale University, UR 4492, UCEIV, SFR Condorcet FR CNRS 3417, 145 Avenue Maurice Schumann, 59140 Dunkerque, France
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Eco-Technilin SAS, ZA Caux Multipôles, 76190 Valliquerville, France
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Polymers Composites and Hybrids (PCH), IMT Mines Ales, 30100 Alès, France
*
Author to whom correspondence should be addressed.
Coatings 2021, 11(7), 846; https://doi.org/10.3390/coatings11070846
Received: 23 June 2021 / Revised: 6 July 2021 / Accepted: 11 July 2021 / Published: 14 July 2021
(This article belongs to the Special Issue Natural Fiber Based Composites)
Pre-treatments for plant fibres are very popular for increasing the fineness of bundles, promoting individualisation of fibres, modifying the fibre-matrix interface or reducing water uptake. Most pre-treatments are based on the use of chemicals and raise concerns about possible harmful effects on the environment. In this study, we used physical pre-treatments without the addition of chemical products. Flax tows were subjected to ultrasound and gamma irradiation to increase the number of elementary fibres. For gamma pre-treatments, a 20% increase in the number of elementary fibres was quantified. The biochemical composition of pre-treated flax tows exhibited a partial elimination of sugars related to pectin and hemicelluloses depending on the pre-treatment. The hygroscopic behaviour showed a comparable decreasing trend for water sorption-desorption hysteresis for both types of pre-treatment. Then, non-woven composites were produced from the pre-treated tows using poly-(lactid) (PLA) as a bio-based matrix. A moderate difference between the composite mechanical properties was generally demonstrated, with a significant increase in the stress at break observed for the case of ultrasound pre-treatment. Finally, an environmental analysis was carried out and discussed to quantitatively compare the different environmental impacts of the pre-treatments for composite applications; the environmental benefit of using gamma irradiation compared to ultrasound pre-treatment was demonstrated. View Full-Text
Keywords: flax tows; ultrasound; gamma treatment; DVS; environmental analysis; mechanical properties; composite materials flax tows; ultrasound; gamma treatment; DVS; environmental analysis; mechanical properties; composite materials
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MDPI and ACS Style

Gautreau, M.; Kervoelen, A.; Barteau, G.; Delattre, F.; Colinart, T.; Pierre, F.; Hauguel, M.; Le Moigne, N.; Guillon, F.; Bourmaud, A.; Beaugrand, J. Fibre Individualisation and Mechanical Properties of a Flax-PLA Non-Woven Composite Following Physical Pre-Treatments. Coatings 2021, 11, 846. https://doi.org/10.3390/coatings11070846

AMA Style

Gautreau M, Kervoelen A, Barteau G, Delattre F, Colinart T, Pierre F, Hauguel M, Le Moigne N, Guillon F, Bourmaud A, Beaugrand J. Fibre Individualisation and Mechanical Properties of a Flax-PLA Non-Woven Composite Following Physical Pre-Treatments. Coatings. 2021; 11(7):846. https://doi.org/10.3390/coatings11070846

Chicago/Turabian Style

Gautreau, Maxime, Antoine Kervoelen, Guillaume Barteau, François Delattre, Thibaut Colinart, Floran Pierre, Maxime Hauguel, Nicolas Le Moigne, Fabienne Guillon, Alain Bourmaud, and Johnny Beaugrand. 2021. "Fibre Individualisation and Mechanical Properties of a Flax-PLA Non-Woven Composite Following Physical Pre-Treatments" Coatings 11, no. 7: 846. https://doi.org/10.3390/coatings11070846

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