Evolution of flax cell wall ultrastructure and mechanical properties during the retting step
| Autor: | Loïc Foucat, Olivier Arnould, David Siniscalco, Camille Goudenhooft, Christophe Baley, Bruno Pontoire, Johnny Beaugrand, Xavier Falourd, Alain Bourmaud |
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| Přispěvatelé: | Institut de Recherche Dupuy de Lôme (IRDL), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), Unité de recherche sur les Biopolymères, Interactions Assemblages (BIA), Institut National de la Recherche Agronomique (INRA), Bois (BOIS), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Retting
Materials science Polymers and Plastics Compaction Modulus Mechanical properties 02 engineering and technology 010402 general chemistry 01 natural sciences Nuclear magnetic resonance Crystallinity Atomic force microscopy Solid-state Indentation [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] Materials Chemistry Composite material chemistry.chemical_classification Organic Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Amorphous solid X-ray diffraction [CHIM.POLY]Chemical Sciences/Polymers Solid-state nuclear magnetic resonance chemistry Flax fibres 0210 nano-technology |
| Zdroj: | Carbohydrate Polymers Carbohydrate Polymers, Elsevier, 2019, 206, pp.48-56. ⟨10.1016/j.carbpol.2018.10.065⟩ |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/j.carbpol.2018.10.065⟩ |
| Popis: | International audience; Flax retting is a major bioprocess in the cultivation and extraction cycle of flax fibres. The aim of the present study is to improve the understanding of the evolution of fibre properties and ultrastructure caused by this process at the plant cell wall scale. Initially, investigations of the mechanical performances of the flax cell walls by Atomic Force Microscopy (AFM) in Peak Force mode revealed a significant increase (+33%) in the cell wall indentation modulus with retting time. Two complementary structural studies are presented here, namely using X-Ray Diffraction (XRD) and solid state Nuclear Magnetic Resonance (NMR). An estimation of the cellulose crystallinity index by XRD measurements, confirmed by NMR, shows an increase of 8% in crystallinity with retting mainly due to the disappearance of amorphous polymer. In addition, NMR investigations show a com-paction of inaccessible cell wall polymers, combined with an increase in the relaxation times of the C4 carbon. This densification provides a structural explanation for the observed improvement in mechanical performance of the secondary wall of flax fibres during the field retting process. |
| Databáze: | OpenAIRE |
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