Modelling of wicking and moisture interactions of flax and viscose fibres

Stuart, T.; McCall, Ralph; Sharma, H. S. S.; Lyons, G.

doi:10.1016/j.carbpol.2015.01.053

Cited by 22 publications

(17 citation statements)

References 25 publications

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“…Moreover, the surrounding matrix and its constraining effect on flax fibres reduce their accessibility to water but also their swelling[28][29]. The stress state at the fibre/matrix interface is likely to be modified while additional compressive stresses develop on fibres.As observed in figure 1b, the radial swelling strain of flax fibre reaches a maximal value of 21 ± 3% at 98% RH confirming results of Stuart et al[30] and Pucci et al[31].Unlike the radial swelling evolution of flax fibre, over the relative humidity scale (20-98 %), its evolution with moisture content (data taken from[25]) appears quasi-linear (R²= 0.99). Thus, a linear regression enables the radial hygroscopic coefficient βf, R = 1.14 ε/∆m to be estimated for a single flax fibre.…”

supporting

confidence: 86%

Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength

Duigou

Mérotte

Bourmaud

et al. 2017

Composites Science and Technology

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International audienceThe present article aims to investigate the contribution of hygroscopic expansion of flax fibres to interfacial radial stresses and Interfacial Shear Strength (IFSS) of Maleic Anhydride grafted Polypropylene (MAPP)/Flax biocomposites. During manufacturing of thermoplastic biocomposites and storage at 50% RH, a weight variation is observed, attributed to water content evolution within plant cell-walls. The hygroscopic radial expansion coefficient beta r (flax) of single flax fibres estimated by Environmental Scanning Electron Microscopy (ESEM) observation is many orders of magnitude higher (beta(f,R) = 1.14 s/Delta m) than thermal expansion (alpha(f,R) = 78 10(-6) epsilon/degrees C). Thus, its contribution to the development of residual stresses sigma(rad) during processing should be prevalent. A multiscale analysis of interfacial stress state and hygroscopic contribution is performed with the use of a cylindrical concentric model at microscopic scale and asymmetric composite laminates [0, 90 degrees] curvature generation at macroscopic scale. Similar radial stresses are obtained, while relevant values of mu (IFSS/sigma(rad)) approximate to 0.46 are calculated. Therefore, the interfacial bond strength of natural fiber/polymer systems should be described by taking into account their hygroscopic behavior. (C) 2017 Elsevier Ltd. All rights reserved

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supporting

confidence: 86%

Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength

Duigou

Mérotte

Bourmaud

et al. 2017

Composites Science and Technology

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“…Water, diidomethane, ethylene glycol and glycerol contact angle on the fiber surface was determined using the Wilhelmy plate method (Online Resource Figure S2). A Washburn sorption method is suggested to be superior for fibers due to their evident liquid uptake and capillary action (Stuart et al 2015 ). However, measurements with this mode resulted in no apparent sorption taking place and hence the Wilhelmy plate method was used.…”

Section: Resultsmentioning

confidence: 99%

Conversion of wood-biopolymers into macrofibers with tunable surface energy via dry-jet wet-spinning

et al. 2018

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Surface chemistry of regenerated all-wood-biopolymer fibers that are fine-tuned by composition of cellulose, lignin and xylan is elucidated via revealing their surface energy and adhesion. Xylan additive resulted in thin fibers and decreased surface energy of the fiber outer surfaces compared to the cellulose fibers, or when lignin was used as an additive. Lignin increased the water contact angle on the fiber surface and decreased adhesion force between the fiber cross section and a hydrophilic probe, confirming that lignin reduced fiber surface affinity to water. Lignin and xylan enabled fiber decoration with charged groups that could tune the adhesion force between the fiber and an AFM probe. The fibers swelled in water: the neat cellulose fiber cross section area increased 9.2%, the fibers with lignin as the main additive 9.1%, with xylan 6.8%, and the 3-component fibers 5.5%. This indicates that dimensional stability in elevated humidity is improved in the case of 3-component fiber compared to 2-component fibers. Xylan or lignin as an additive neither improved strength nor elongation at break. However, improved deformability was achieved when all the three components were incorporated into the fibers.Graphical Abstract Electronic supplementary materialThe online version of this article (10.1007/s10570-018-1902-4) contains supplementary material, which is available to authorized users.

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“…Baiardo et al 55 observed the effects of many chemical treatments on flax fiber/PE composites and found that valerylated flax fiber-reinforced PE composites had greater value of modulus and tensile characteristics as compared to untreated, acetylated, and PEG 350, 750 grafting treated flax fiber-reinforced PE composites, whereas acetylation had adverse effects on modulus and tensile characteristics of flax/PE composites. 56 Vazquez et al 57 conducted a study in which they observed the effects of (i) mercerization treatment, (ii) acrylation treatment, (iii) isocyanate treatment on the tensile characteristic of bagasse fiber/PP composite and observed that all treatments had positive effects on tensile strength of bagasse/PP composites. In addition, isocyanate treatment had highest improvement in tensile strength as compared to remaining surface treatments.…”

Section: Effects Of Surface Treatments On the Tensile Properties Of Nfcsmentioning

confidence: 99%

Surface treatments of plant fibers and their effects on mechanical properties of fiber-reinforced composites: A review

Latif

Wakeel

Khan

et al. 2018

Journal of Reinforced Plastics and Composites

187

127

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The need of natural fiber-reinforced composites is increasing at very fast rate because of their ecofriendly production, decomposition, high specific strength, abundance, good physical and mechanical properties. Available literature reveals that past researchers have done a lot of work for the preparation and characterization of fiber-reinforced composites. While developing natural fiber composites, researchers encountered various problems like hydrophilic nature of natural fibers, incompatibility of natural fibers with matrix materials, thermal instability of natural fibers, and poor interfacial bonding between reinforcing phase and matrix phase. However, some of these problems can be solved to a greater extent by considering surface treatment of natural fibers before they are used in the preparation of fiber-reinforced composites. Thus, there is a need for understanding the effect of several surface treatments on the mechanical properties of fiber-reinforced composites. The aim of this paper is to put forth a comprehensive review on the effects of different surface treatments on the mechanical properties such as tensile strength, flexural strength, and impact strength and also interfacial shear strength of the fiber-reinforced composites.

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Modelling of wicking and moisture interactions of flax and viscose fibres

Cited by 22 publications

References 25 publications

Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength

Hygroscopic expansion: A key point to describe natural fibre/polymer matrix interface bond strength

Conversion of wood-biopolymers into macrofibers with tunable surface energy via dry-jet wet-spinning

Surface treatments of plant fibers and their effects on mechanical properties of fiber-reinforced composites: A review

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