Assessment of 3D moisture diffusion parameters on flax/epoxy composites

Saidane, El Hadi; Scida, Daniel; Assarar, Mustapha; Ayad, Rézak

doi:10.1016/j.compositesa.2015.10.008

Cited by 54 publications

(22 citation statements)

References 27 publications

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“…Epoxies or unsaturated polyesters are generally used [38,[42][43][44][45][46]. Some authors apply high temperatures (≈ 130°C) to cure flax/epoxy composite materials by thermo-compression [38,42,45] for a minimal duration (≈ 2 h).…”

Section: Introductionmentioning

confidence: 99%

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What are the key parameters to produce a high-grade bio-based composite? Application to flax/epoxy UD laminates produced by thermocompression

Cadu

Berges

Sicot

et al. 2018

Composites Part B: Engineering

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The development of composites based on vegetal fibers requires a good control of manufacturing process. The aim of this work is to determine the key parameters to produce high grade flax / epoxy unidirectional laminated composite by thermocompression. So, many processing parameters have been tested and ranked according to their influence on mechanical properties. Since variability can be high for this kind of materials, statistical analyses have been used to determine if properties variations were significant or not. Among all studied parameters, the three which have been identified as first rank influence on mechanical properties are: fibers conditioning, curing pressure and exit plate temperature.

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Section: Introductionmentioning

confidence: 99%

“…Some authors apply high temperatures (≈ 130°C) to cure flax/epoxy composite materials by thermo-compression [38,42,45] for a minimal duration (≈ 2 h). Others propose to cure flax/epoxy [44,46] or polyester/epoxy [43] at room temperature. This induces very long cycle times (>12 h) that could not be adapted to industrial objectives.…”

Section: Introductionmentioning

confidence: 99%

What are the key parameters to produce a high-grade bio-based composite? Application to flax/epoxy UD laminates produced by thermocompression

Cadu

Berges

Sicot

et al. 2018

Composites Part B: Engineering

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show abstract

“…The growing interest in using natural fibres as reinforcement in polymeric based composites is mainly due to their abundance, renewable origin, relatively high specific strength and modulus, light-weight, low cost and biodegradability when compared to glass fibres 1 . This is driven by vast demands of new eco-friendly materials that present low environmental impact 2 . In contrast, a serious problem of natural fibres is their strong polar character which creates incompatibility with most polymer matrices as well as compounding difficulties.…”

Section: Introductionmentioning

confidence: 99%

Bio-based coatings for reducing water sorption in natural fibre reinforced composites

Mokhothu

John

2017

Sci Rep

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In this study, bio-based coatings were used for reducing water sorption of composites containing flame retardant treated natural fibres and phenolic resin. Two types of coatings; polyfurfuryl alcohol resin (PFA) and polyurethane (PU) were used on the composites and compared with a water resistant market product. Uncoated and coated samples were conditioned at 90 °C and relative humidity of 90% for three days and the relative moisture content and mechanical properties after conditioning were analysed. In addition, the changes in the weight loss of the conditioned samples were also investigated by thermogravimetric analysis. The moisture diffusion characteristics of coated laminates were also studied at room temperature under water immersion conditions. PFA coated samples showed better moisture resistance and mechanical performance than other bio-based coatings when subjected to long term environmental aging.

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“…The anisotropy and morphology of flax fibers have a considerable effect on the diffusivity of water. The diffusivity of water across and along the direction of the fibers is considerably higher relative to the diffusivity across the thickness direction [203]. The influence of the moisture absorption during the manufacturing process of flax fiber/UP composite on the interfacial adhesion strength could be limited [204].…”

Section: Flax Fiber Compositesmentioning

confidence: 99%

Critical Review of the Parameters Affecting the Effectiveness of Moisture Absorption Treatments Used for Natural Composites

2019

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Natural composites can be fabricated through reinforcing either synthetic or bio-based polymers with hydrophilic natural fibers. Ultimate moisture absorption resistance at the fiber–matrix interface can be achieved when hydrophilic natural fibers are used to reinforce biopolymers due to the high degree of compatibility between them. However, the cost of biopolymers is several times higher than that of their synthetic counterparts, which hinders their dissemination in various industries. In order to produce economically feasible natural composites, synthetic resins are frequently reinforced with hydrophilic fibers, which increases the incompatibility issues such as the creation of voids and delamination at fiber–matrix interfaces. Therefore, applying chemical and/or physical treatments to eliminate the aforementioned drawbacks is of primary importance. However, it is demonstrated through this review study that these treatments do not guarantee a sufficient improvement of the moisture absorption properties of natural composites, and the moisture treatments should be applied under the consideration of the following parameters: (i) type of hosting matrix; (ii) type of natural fiber; (iii) loading of natural fiber; (iv) the hybridization of natural fibers with mineral/synthetic counterparts; (v) implantation of nanofillers. Complete discussion about each of these parameters is developed through this study.

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Assessment of 3D moisture diffusion parameters on flax/epoxy composites

Cited by 54 publications

References 27 publications

What are the key parameters to produce a high-grade bio-based composite? Application to flax/epoxy UD laminates produced by thermocompression

What are the key parameters to produce a high-grade bio-based composite? Application to flax/epoxy UD laminates produced by thermocompression

Bio-based coatings for reducing water sorption in natural fibre reinforced composites

Critical Review of the Parameters Affecting the Effectiveness of Moisture Absorption Treatments Used for Natural Composites

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