Search results for " Environmental degradation"

showing 2 items of 12 documents

Hydrolytic degradation of PLA/Posidonia Oceanica green composites: A simple model based on starting morpho-chemical properties

2021

Abstract In this work, we studied the degradability of PLA-based biocomposites containing Posidonia Oceanica flour at different loading levels and aspect ratios. Hydrolytic tests were carried out in neutral (pH = 7.4) and alkaline (pH = 10) environment. Time-dependent evolution of some key features, including residual mass and solution uptake, was monitored, and correlated with the changes observed in both morphology and chemical structure of the matrix. The results pointed out that biocomposites degraded much faster than neat PLA in both conditions, up to lose 70% of their initial weight after 1000 h immersion. A complex mechanism was unveiled, evidencing the crucial role of the fillers, c…

chemistry.chemical_classificationBio composites Durability Environmental degradation Hydrolytic degradation Natural fibre compositesMorphology (linguistics)Materials sciencebiologyChemical structureGeneral Engineering02 engineering and technologyPolymer010402 general chemistry021001 nanoscience & nanotechnologybiology.organism_classification01 natural sciences0104 chemical sciencesMatrix (chemical analysis)HydrolysisSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryPosidonia oceanicaCeramics and CompositesDegradation (geology)Chemical stabilityComposite material0210 nano-technology
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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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