Marie Bayart

Bio: Marie Bayart is an academic researcher from Université de Sherbrooke. The author has contributed to research in topics: Materials science & Extrusion. The author has an hindex of 3, co-authored 5 publications receiving 40 citations.

Mechanical and moisture absorption characterization of PLA composites reinforced with nano-coated flax fibers

Abstract: This research is intended to improve the interface between the fibers and the matrix and limit water absorption of bio-based material thereby decreasing degradation of the composites when they are exposed to external environment such as high temperature and humidity. In this study, flax fibers were treated with an organic surface coating containing SiO2 nanoparticles. This coating was a dispersion of silica fume in epoxy. One composite was also made with raw fibers as reference as well as one sample of pure PLA. Flax fibers/PLA composites were manufactured by hot pressing by stacking 4 PLA films and 3 pieces of flax fabric. Morphology and dispersion of the coating on the fibers was observed by scanning electron microscopy (SEM), small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). Accelerated ageing was carried out on the 3 materials by placing them in a 50 °C water bath until saturation to investigate the influence of the coating on water diffusion. Mechanical properties of the different composites were investigated by tensile (before and after conditioning) and short beam shear (SBS) testing in order to evaluate the impact of the coating on the interfacial properties of the materials. The results show that the fibers surface was homogenized and that a better adhesion was reached because of the coating. Coating the fibers also allowed the decrease in water uptake by more than 10 % and their protection during conditioning, preserving their mechanical properties.

PLA/flax fiber bio-composites: effect of polyphenol-based surface treatment on interfacial adhesion and durability

Abstract: Fiber treatments to enhance interfacial adhesion in natural fiber-reinforced composites generally induce the use of many chemicals. To address this issue, the present work aimed to develop innovati...

Poly(lactic acid)/flax composites: effect of surface modification and thermal treatment on interfacial adhesion, crystallization, microstructure, and mechanical properties

Abstract: In this study, unidirectional flax fabrics were used to reinforce poly(lactic acid) (PLA). Flax/PLA composites were produced by thermo-compression using as-received flax fibers and titanium dioxide...

Pellet-Based Fused Filament Fabrication (FFF)-Derived Process for the Development of Polylactic Acid/Hydroxyapatite Scaffolds Dedicated to Bone Regeneration

Abstract: Scaffolds can be defined as 3D architectures with specific features (surface properties, porosity, rigidity, biodegradability, etc.) that help cells to attach, proliferate, and to differentiate into specific lineage. For bone regeneration, rather high mechanical properties are required. That is why polylactic acid (PLA) and PLA/hydroxyapatite (HA) scaffolds (10 wt.%) were produced by a peculiar fused filament fabrication (FFF)-derived process. The effect of the addition of HA particles in the scaffolds was investigated in terms of morphology, biological properties, and biodegradation behavior. It was found that the scaffolds were biocompatible and that cells managed to attach and proliferate. Biodegradability was assessed over a 5-month period (according to the ISO 13781-Biodegradability norm) through gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and compression tests. The results revealed that the presence of HA in the scaffolds induced a faster and more complete polymer biodegradation, with a gradual decrease in the molar mass (Mn) and compressive mechanical properties over time. In contrast, the Mn of PLA only decreased during the processing steps to obtain scaffolds (extrusion + 3D-printing) but PLA scaffolds did not degrade during conditioning, which was highlighted by a high retention of the mechanical properties of the scaffolds after conditioning.

Mechanical & Interfacial Properties of Bamboo Lamella-PP Composites – Effect of Lamella Treatment

Abstract: This study aims at measuring the interfacial properties of natural fibers in polypropylene composites by the mean of direct methods of characterization. Bamboo lamellae (BL) and polypropylene (PP) were used to produce laminated composites with continuous and homogenous interfaces. This research also focuses on the effect of maleic anhydride-grafted PP (MAPP) on the improvement of the PP/BL composites interfacial properties, which were measured by the means of the double cantilever beam (DCB), end-notched flexure (ENF) and short beam shear (SBS) methods. Flexural properties of the different composites were also determined using the three-point bending and single cantilever modes by dynamic mechanical analysis (DMA). The retention rates (Rr) of mechanical and interfacial properties were calculated on samples aged in hot water. Results reveal that MAPP induced a significant increase in flexural properties. This is undeniably related to an enhancement of affinity between PP and BL that was confirmed by DCB, ENF and SBS tests results. It was also highlighted that MAPP tends to limit degradation of the composite interfacial properties with,for instance, a critical fracture toughness (mode I) Rr of 97 % for MAPP coated composites against 56 % for the untreated composites.

PLA Composites Reinforced with Flax and Jute Fibers-A Review of Recent Trends, Processing Parameters and Mechanical Properties.

Abstract: Multiple environmental concerns such as garbage generation, accumulation in disposal systems and recyclability are powerful drivers for the use of many biodegradable materials. Due to the new uses and requests of plastic users, the consumption of biopolymers is increasing day by day. Polylactic Acid (PLA) being one of the most promising biopolymers and researched extensively, it is emerging as a substitute for petroleum-based polymers. Similarly, owing to both environmental and economic benefits, as well as to their technical features, natural fibers are arising as likely replacements to synthetic fibers to reinforce composites for numerous products. This work reviews the current state of the art of PLA compounds reinforced with two of the high strength natural fibers for this application: flax and jute. Flax fibers are the most valuable bast-type fibers and jute is a widely available plant at an economic price across the entire Asian continent. The physical and chemical treatments of the fibers and the production processing of the green composites are exposed before reporting the main achievements of these materials for structural applications. Detailed information is summarized to understand the advances throughout the last decade and to settle the basis of the next generation of flax/jute reinforced PLA composites (200 Maximum).

Durable Polylactic Acid (PLA)-Based Sustainable Engineered Blends and Biocomposites: Recent Developments, Challenges, and Opportunities

Abstract: The paper comprehensively reviews durable polylactic acid (PLA)-based engineered blends and biocomposites supporting a low carbon economy. The traditional fossil fuel derived nonrenewable durable p...

Novel approach for silane treatment of flax fiber to improve the interfacial adhesion in flax/bio epoxy composites:

Abstract: Natural fibers have been approved as an excellent alternative for traditional reinforcements in polymer composites. However, the main disadvantage of natural fibers as reinforcements is their poor ...

Flax fiber–based polymer composites: a review

Abstract: Flax is one of the popular natural fibers used as a reinforcing agent for polymer composite. The raw flax fiber is hydrophilic in nature, and the chemical constituent of flax is mainly cellulose, hemicellulose, lignin, etc. To improve the interfacial adhesion between flax fiber and polymer matrix, the surface treatment is given to the fiber. The polymer matrix used for reinforcement is thermoplastic, thermosets, and polymers derived from natural resources. The composites can be made by various processing techniques such as extrusion, compression, hand lay-up, etc. The flax fiber improves the biodegradability and recyclability of the composite, and it shows better mechanical performance as compared to plain polymers. The reinforcement of flax fiber in polymer matrix improves its tensile properties, flexural properties, impact resistance, hardness, etc. The hybridization of fibers is another approach that combines two or more fibers in a polymer matrix and has a synergistic effect through more than one fiber. The flax fiber composite is more eco-friendly than corresponding petroleum-based fiber composites.