Numerical and experimental assessment of water absorption of wood-polymer composites

Mrad, Hatem; Alix, Sébastien; Migneault, Sébastien; Koubaa, Ahmed; Perré, Patrick

doi:10.1016/j.measurement.2017.10.011

Cited by 54 publications

(35 citation statements)

References 22 publications

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“…The results of water uptake tests show that water absorption and volume change of WPCs decreased with the addition of biochar (Figure 8a-c). In good agreement with previous findings [24,39], higher fiber proportions for both types of wood biochar fibers led to higher water uptake and volume change. However, biocomposites made with wood particles swelled to a greater extent than those with biochar at all fiber proportions.…”

Section: Water Uptake and Contact Anglesupporting

confidence: 93%

Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites

et al. 2020

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The physical and mechanical properties of wood (WPC) and biochar polymer composites (BPC) obtained at different pyro-gasification temperatures and different fiber proportions were investigated. Composite pellets made from wood chips or biochar and thermoplastic polymers (polypropylene or high-density polyethylene) were obtained by twin-screw extrusion, and test specimens were prepared by injection molding. Results showed that BPCs were more dimensionally stable compared to WPCs, but their mechanical properties decreased with increasing pyro-gasification temperatures due to the poor adhesion between the polymer and biochar. Indeed, FTIR investigations revealed the decrease or absence of hydroxyl groups on biochar, which prevents the coupling agent from reacting with the biochar surface. The change in the biochar chemical structure led to an improvement in the dimensional stability and hydrophobicity of the biocomposites. Despite the increased dimensional stability of BPCs compared to WPCs, BPCs still adsorb water. This was explained by the surface roughness and by the biochar agglomerations present in the composite. In conclusion, the thermochemical conversion of black spruce wood chips into biochar makes it brittle but more hydrophobic, thereby reducing the wettability of the BPCs.

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Section: Water Uptake and Contact Anglesupporting

confidence: 93%

Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites

et al. 2020

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“…It was inferred that the presence of 0.1wt% TiO2 minimised the water diffusion quotient by 9% in all the nano TiO2 modified composites. Mrad et al (2018) estimate the water absorption properties of wood-plastic composites prepared by means of industrial wood waste.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of Water Absorption Parameters of Dual-Filler Filled Composites Using Taguchi and Moderated Taguchi Techniques

2019

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This work contributes two novel modified Taguchi techniques to the optimal parametric setting for minimum water absorption in epoxy composites. Taguchi method, using ASTM standards was applied with factors (initial weight, final weight, length, sample thickness and time of immersion) and four levels in the experimental design. The analysis of variance (ANOVA) evaluates the significance and individual contributions of the parameters. The optimal parametric setting was A1B4C3D4E1 (initial weight, 2.61 g; final weight, 2.69 g; length, 62.73 mm; thickness, 3.88 mm; time, 15.65 hrs). The ANOVA identifies time and length as dominant parameters (98.98 and 1.02 % contributions, respectively). Taguchi-Pareto analysis found only factor-level from the time and length parameters economical to optimality. The Taguchi-ABC analysis revealed the individual weights and contributions of the factor-level irrespective of its initial groupings. The new Taguchi techniques highlighted the importance of time and length of sample in obtaining minimum water absorption of composites.

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“…Composites reinforced with large wood particles exhibit high thickness swelling and water diffusivity. The molecules of water can diffuse in WPCs through the interface between the fiber and the matrix, fiber lumen, and fiber cell [189,190]. The penetration of water molecules into the structure of WPCs decreases the mechanical properties of the composite considerably.…”

Section: Wood Plastic 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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Numerical and experimental assessment of water absorption of wood-polymer composites

Cited by 54 publications

References 22 publications

Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites

Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites

Optimisation of Water Absorption Parameters of Dual-Filler Filled Composites Using Taguchi and Moderated Taguchi Techniques

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

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