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

Coatings

Maxime Gautreau¹  Johnny Beaugrand¹  Fabienne Guillon¹  Floran Pierre²  Maxime Hauguel²  Nicolas Le Moigne³  Alain Bourmaud⁴  Guillaume Barteau⁴  Antoine Kervoelen⁴  Thibaut Colinart⁴  François Delattre⁵ 

[1] Biopolymères Interactions Assemblages (BIA), INRA, Rue de la Géraudière, F-44316 Nantes, France;Eco-Technilin SAS, ZA Caux Multipôles, 76190 Valliquerville, France;Polymers Composites and Hybrids (PCH), IMT Mines Ales, 30100 Alès, France;Research Institute Dupuy De Lôme (IRDL), University Bretagne Sud, UMR CNRS 6027, F-56100 Lorient, France;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;

关键词: flax tows;    ultrasound;    gamma treatment;    DVS;    environmental analysis;    mechanical properties;   

DOI  :  10.3390/coatings11070846

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown