0000000000700120

AUTHOR

Davide Palamara

showing 3 related works from this author

On the response of flax fiber reinforced composites under salt-fog/dry conditions: Reversible and irreversible performances degradation

2022

Abstract Despite their scarce resistance to humid or wet conditions, natural fiber reinforced composites (NFRCs) seem to be able to partially recover their performances under discontinuous exposition to marine environment. To investigate this peculiarity, flax fiber reinforced composite was at first subjected to salt-fog spray condition at 35 °C for 15 and 30 days, respectively, and then stored in ‘‘dry” condition (i.e., 50% R.H. and 22 °C) between 0 and 21 days. The performances evolution was evaluated through flexural tests, water uptake and contact angle measurements. Moreover, the morphology of fractured mechanical samples was examined by using 3D optical microscope and scanning electro…

D. Mechanical testingMaterials scienceScanning electron microscopeMechanical EngineeringComposite numberIndustrial and Manufacturing EngineeringA. Polymer-matrix composites (PMCs); B. Environmental degradation; D. Mechanical testing; Moisture desorptionlaw.inventionContact angleA. Polymer-matrix composites (PMCs)Settore ING-IND/22 - Scienza E Tecnologia Dei MaterialiOptical microscopeFlexural strengthMoisture desorptionMechanics of MaterialslawPhase (matter)Ceramics and CompositesDegradation (geology)B. Environmental degradationComposite materialNatural fiber
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In situ monitoring of moisture uptake of flax fiber reinforced composites under humid/dry conditions

2021

The use of green materials such as natural fiber-reinforced composites represents an increasingly stringent prerogative in the future planning of industrial and non-industrial production. The optimization of these materials is the main aim of the current research, focused on the evaluation of the behavior of flax fiber reinforced composites exposed to isothermal adsorption and desorption cycles, at varying the partial pressure of water vapor (P/P0). For this purpose, the moisture uptake and the morphology changes of the composite material and their constituents were in situ monitored through a measurement protocol, by using a dynamic vapor sorption (DVS) analysis, coupled with an environmen…

Flax fiberIn situadsorption; composites; fibers; microscopyAdsorptionMaterials scienceSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiPolymers and PlasticsMoistureMaterials ChemistryGeneral ChemistryComposite materialAdsorption composites fibers microscopySurfaces Coatings and Films
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Performances Recovery of Flax Fiber Reinforced Composites after Salt-Fog Aging Test

2022

In the present paper, the performance recovery under conditions of discontinuous exposure to a marine environment of a natural fiber-reinforced composite (NFRC) reinforced by flax fibers was assessed. In particular, this laminate was initially exposed to salt-fog for 15 and 30 days, and then stored in a controlled air condition for up to 21 days. The flax fiber-reinforced composite showed coupled reversible and irreversible aging phenomena during the wet stage, as well as evidencing a significant mechanical recovery during the dry stage. Unlike the stiffness, the laminate showed a noticeable recovery of its flexural strength. This behavior affected the composite material toughness. A simpli…

polymer–matrix composites (PMCs); environmental degradation; natural fibers; wet–dry; agingSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiCeramics and Compositesaging environmental degradation natural fibers polymer–matrix composites (PMCs) wet–dryEngineering (miscellaneous)
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