Adsorption of xyloglucan and cellulose nanocrystals on natural fibres for the creation of hierarchically structured fibres

Abstract

Green treatment of natural fibres is a major issue in paper, textile and biocomposites industries to design innovative and eco-friendly products. In this work, hierarchical structuring of flax woven fabrics by the adsorption of xyloglucan (XG) and cellulose nanocrystals (CNC) is studied. Indeed, CNC have high mechanical properties, high specific surface area and great potential for functionalization. The adsorption of XG and CNC has been investigated in terms of localization by confocal and scanning electron microscopy (SEM) and quantification through adsorption isotherms. Adhesion force measurements have also been performed by Atomic Force Microscopy (AFM). XG and CNC are homogeneously adsorbed on flax fabric and adsorption isotherms reach plateau values around 20 mg /g fibres for both. The pre-adsorption of XG on flax fabric influences the amount of adsorbed CNC in the high concentrations and also creates entanglements and strong interactions between XG and CNC with the formation of an extensible network.

Hierarchical thermoplastic biocomposites reinforced with flax fibres modified by xyloglucan and cellulose nanocrystals

“…The resulting CNC and XG/CNC modified flax fibres, named flax_CNC and flax_XG/CNC respectively, were stored in a conditioning room at 23 • C and 50 % relative humidity. Note that more details about sorption isotherms and localization of XG and CNC on flax fibres can be found in our previous work (Doineau et al, 2020). Based on this study, the adsorbed amounts of XG or CNC onto flax fibre surfaces were estimated around 2 wt% (20 mg / g fibre ).…”

“…This suggests that the presence of both XG and CNC on the flax fibres modifies the failure mechanisms in the interphase zone between fibres and matrix, leading to higher forces and elongation at break. This extensible XG/CNC network with strong interactions and increasing rupture distance was characterized in our previous work (Doineau et al, 2020) by AFM adhesive force measurements. Our results suggest that such a network can have a positive influence on the breaking strength of composite systems.…”

Achieving sandwich-like laminated composite materials for robust superhydrophobicity, rapid photochromism and photo-mask writable media

“…[1][2][3] As a green biopolymer extracted from natural cellulose, cellulose nanocrystals have excellent physical properties and extraordinary biological properties. [4][5][6][7][8] Therefore, as a promising biopolymer, it is widely used as a reinforcing filler in polymer composite materials 7,9 and the development of sustainable and high-performance materials. 6,10,11 In addition, cellulose nanocrystals also have the advantages of being easily obtained from renewable resources and being easily biodegradable, attracting more and more attention from researchers.…”

A green attapulgite bacterial cellulose imprinted aerogel for selective adsorption and recovery of Dy(III)

“…In recent years, bacterial cellulose (BC) has become a promising green biomass raw material due to its excellent mechanical properties and biocompatibility (Oshima et al 2008; Sakwises et al 2017). More importantly, the 3D network structure of BC has a good pore structure, which can provide a good basis for the adsorption behavior (Doineau et al 2020). At the same time, a plenty of oxygen-containing groups on the surface of BC, especially hydroxyl groups, provide the possibility for subsequent modi cation of the material, and carboxylation modi cation can increase bonding strength between BC and metal ions, thereby achieving e cient adsorption of Dy(III).…”