Influence of the wetting properties of polymeric adhesives on the mechanical behaviour of cork agglomerates

Teixeira, M. Joao; Fernandes, Anabela C.; Saramago, Benilde; Rosa, M. Emília; Bordado, João

doi:10.1163/156856196x00148

Cited by 10 publications

(8 citation statements)

References 11 publications

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“…As reported before, high density agglomerated foam obtained by uni-axial compression displays an anisotropic mechanical behaviour [31] caused by an anisotropic microstructure at the bead scale [20]. X-ray tomography analysis showed that after the fabrication process, beads are flattened in the compression plane, i.e.…”

Section: Fibre Orientation Effectsupporting

confidence: 53%

“…As already noted, uniaxial compression manufacturing process causes a transversal anisotropy for high density foam agglomerates [20,31]. Beads of the cellular material tend to be flattened in the compression plane, i.e.…”

Section: Fibre Placement and Orientationmentioning

confidence: 73%

“…3(a) shows that instead of considering only the sharp resin/particle interface, an interfacial area called the interphase should be consideblack [30]. This is composed of collapsed cells at the bead periphery and resin coating the cork surface [20,31] and will display a high gradient in its mechanical properties. The thickness of the interphase is variable but is around 30 µm, as shown in Fig.…”

Section: Interphasesmentioning

confidence: 99%

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Reinforcement of cellular materials with short fibres: Application to a bio-based cork multi-scale foam

Barbenchon

Kopp

Girardot

et al. 2020

Mechanics of Materials

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A bio-sourced foam, agglomerated cork, was chosen to evaluate the influence of short fibres on the mechanical behaviour of cellular materials. The final material was obtained by mixing cork particles with a thermoset resin. Rigid short fibres were then added before uni-axial compression. Enhancing the foam's mechanical properties without increasing the density is a current problem in transport industries. In this article, we demonstrate how the addition of short fibres strongly modifies the mechanical behaviour of agglomerated foam materials. Dynamic Mechanical Analysis technique revealed that the glass temperature was greater for reinforced foams and more energy loss by heat in visco-elasticity was also noticed for this material. In quasistatic compression, rigidity was strongly enhanced, causing absorbed energy before densification to increase. Maximal force and displacement before fracture were studied by applying Mode I fracture tests, and both were improved by the addition of short fibres. The mesoscopic and microscopic observations revealed it was linked to fracture mechanisms, most of which happen inside cork beads for the reinforced cellular material. The properties of agglomerated foams may then be improved and tailoblack by the addtion of short fibres and make weight saving possible in several industrial applications.

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Section: Fibre Orientation Effectsupporting

confidence: 53%

Section: Fibre Placement and Orientationmentioning

confidence: 73%

Section: Interphasesmentioning

confidence: 99%

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Reinforcement of cellular materials with short fibres: Application to a bio-based cork multi-scale foam

Barbenchon

Kopp

Girardot

et al. 2020

Mechanics of Materials

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“…In particular, PU's are compatible with lignocellulosic reinforcements, which contain a high concentration of hydroxyl groups. However, vegetable reinforced PU's have not been systematically studied and there exist few references to this respect 10, 13, 14…”

Section: Introductionmentioning

confidence: 99%

Microfoams based on castor oil polyurethanes and vegetable fibers

Aranguren

Rácz

Marcovich

2007

J of Applied Polymer Sci

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This work was focused on the production and characterization of microcellular polyurethane (PU) composites reinforced with pine wood-fibers or with hemp, which can be applied to the manufacture of car interior panels, or acoustic insulation panels for the construction industry. The polymers selected for the study were crosslinked PUs, synthesized from a castor oil-based polyol, with the formulations adjusted to obtain different foaming levels. Microfoamed composites with preferential orientation were prepared from long hemp fibers. Also, samples with random arrangement of short hemp and wood fibers were obtained. The morphology of the composites was analyzed by scanning electron microscopy. The mechanical performance of the reinforced foams was studied through three point bending and dynamic mechanical tests.

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“…At all stages of the agglomerate manufacturing process, the surface properties of the different components of the stopper (cork particles, binder, and coating agents) will have a decisive impact on its future performance. − Thus, their investigation is of utmost importance, from the first step, with the surface properties of the initial cork material, to the last step with the wetting properties of the coating agent deposited on the surface of the stopper. However, the determination of the surface tension of cork remains complex because of the physical and chemical heterogeneity of the material surface.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Complex Interfacial Properties of Cork-Based Materials in Their Use as Wine Stoppers

Chanut

Wang

Gougeon

et al. 2022

ACS Appl. Mater. Interfaces

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This study investigates the surface and interfacial properties of the different components of a system composed of an agglomerated cork stopper in a glass bottleneck. Each constituting element has carefully been examined to unveil its underlying complexity. First, there was no effect of supercritical CO2 pretreatment or particle size on the surface properties of cork particles. The wettability of the binder was also evaluated, showing that the binder can spread relatively well on the surface of cork particles. Second, capillary rise measurements carried out on three different agglomerated corks indicate that the formulation of the agglomerates has no effect on its surface properties. The binder represents only a small fraction of the total stopper volume and is therefore not the major contributor to the surface tension. Third, the two coating agents studied display different behaviors. The first one, composed of a paraffin emulsion, exhibits poorer wettability than the second one, composed of a paraffin and silicone emulsion. However, once the coating agent has solidified on the surface of the stopper, both coatings display similar adhesion with the glass of the bottleneck. Starting with fundamental considerations, and then progressing to a more applicative aspect, has led to a better understanding of the properties of cork-based materials in their use as wine stoppers.

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Influence of the wetting properties of polymeric adhesives on the mechanical behaviour of cork agglomerates

Cited by 10 publications

References 11 publications

Reinforcement of cellular materials with short fibres: Application to a bio-based cork multi-scale foam

Reinforcement of cellular materials with short fibres: Application to a bio-based cork multi-scale foam

Microfoams based on castor oil polyurethanes and vegetable fibers

Unraveling the Complex Interfacial Properties of Cork-Based Materials in Their Use as Wine Stoppers

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