Search results for "Multifunctional composite"

showing 5 items of 5 documents

Bilayer biodegradable films prepared by co-extrusion film blowing: Mechanical performance, release kinetics of an antimicrobial agent and hydrolytic …

2020

Abstract Bilayer biodegradable, eco-friendly films were prepared by co-extrusion film blowing, coupling polylactic acid (PLA) and Bio-flex ® (BIO). Furthermore, in the PLA layer, carvacrol (CRV) was added as a natural antimicrobial additive, whereas a nanoclay (D72T) was integrated to protect CRV from volatilization and to modulate release. The materials were analyzed by morphological, chemical-physical, mechanical testing. Furthermore, CRV release and degradation tests were performed. The results pointed out that coupling the two matrices allows gathering the stiffness of PLA with the ductility of BIO. Furthermore, the interlayer adhesion is promoted by CRV. D72T exerts a key-role in avoid…

D. Mechanical testingMaterials scienceKinetics02 engineering and technology010402 general chemistry01 natural sciencesE. Extrusion.law.inventionchemistry.chemical_compoundMagazinePolylactic acidlawMonolayerB. Environmental degradationComposite materialBilayerAdhesion021001 nanoscience & nanotechnology0104 chemical sciencesSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiChemical engineeringchemistryMechanics of MaterialsA. Multifunctional compositeCeramics and CompositesDegradation (geology)0210 nano-technologyLayer (electronics)Composites Part A: Applied Science and Manufacturing
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Properties-morphology relationships in electrospun mats based on polylactic acid and graphene nanoplatelets

2018

Abstract Aligned and randomly oriented polylactic acid (PLA) biocomposite nanofiber mats filled with Graphene nanoplatelets (GnP) were prepared by electrospinning. The morphological analysis revealed the successful alignment of the fibers achieved by collecting the mats on a high-speed rotary drum. Furthermore, GnP addition on the polymeric solution leads to an increase of the viscosity with a consequent increment of the fiber diameter. Tensile tests demonstrated that the reinforcing effect of GnP when added to the PLA matrix was more than three times higher in the aligned systems if compared with the respective randomly oriented mats. DSC analysis showed that GnPs were able to slightly inc…

Materials scienceB. Mechanical propertieCeramics and Composite02 engineering and technology010402 general chemistry01 natural scienceschemistry.chemical_compoundCrystallinityPolylactic acidUltimate tensile strengthThermal stabilityA. GrapheneComposite materialThermal analysisE. Electrospinning021001 nanoscience & nanotechnologyElectrospinning0104 chemical sciencesSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryMechanics of MaterialsNanofiberA. Multifunctional compositeCeramics and CompositesBiocomposite0210 nano-technologyComposites Part A: Applied Science and Manufacturing
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Electrospun PCL/GO-g-PEG structures: Processing-morphology-properties relationships

2017

Abstract Polycaprolactone (PCL) biocomposite nanofiber scaffolds with different concentrations of graphene oxide (GO) and GO surface grafted with poly(ethylene glycol) (GO-g-PEG) were prepared by electrospinning. Morphological, mechanical as well as wettability characterizations of electrospun nanofibers were carried out. Results showed that the average diameter of PLA/GO electrospun nanofibers decreased upon increasing the filler content. Differently, the diameter increased while using GO-g-PEG. Both nanofillers enhanced the electrospun PCL hydrophilicity even if PCL/GO-g-PEG samples exhibited improved wettability. The Young moduli of the composite nanofiber mats were improved by adding GO…

Materials scienceComposite numbermacromolecular substances02 engineering and technology010402 general chemistry01 natural sciencesMultifunctional compositechemistry.chemical_compoundPEG ratioComposite materialtechnology industry and agriculturePEGylated graphene oxideequipment and supplies021001 nanoscience & nanotechnologyGraftingElectrospinning0104 chemical scienceschemistryMechanics of MaterialsNanofiberPolycaprolactoneCeramics and CompositesBiocomposite0210 nano-technologyBiocompositeMechanical propertieEthylene glycolComposites Part A: Applied Science and Manufacturing
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An innovative route to prepare in situ graded crosslinked PVA graphene electrospun mats for drug release

2022

We present a fast, one step method to obtain PVA/graphene/chlorhexidine nanofibrous membranes, with a crosslinking gradient along their cross-section. Briefly, polymeric solutions were electrospun onto a heated plate, enabling the in situ crosslinking of PVA macromolecules. Of course, the crosslinking degree of such structures was found to decrease upon the distance from the plate during deposition. The outcomes reveal the crucial role of graphene, capable of promoting heat transfer throughout the entire structure, thus leading to 70-80% crosslinking degrees and preventing delamination issues. Such membranes were compared to untreated and oven thermally treated ones, and a robust relationsh…

Settore ING-IND/22 - Scienza E Tecnologia Dei MaterialiElectrospinningMechanics of MaterialsCeramics and CompositesGrapheneHeat treatmentMultifunctional composite
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Novel method for functionalising and patterning textile composites:Liquid resin print

2016

Abstract The paper reports a novel method of integrating resin into continuous textile reinforcement. The method presents a print of liquid reactive resin into textile preforms. A series of targeted injections forms a patch which upon consolidation and curing transforms into a stiff region continuously spanning through preform thickness. Enhancing the injected resin with conductive phase allows creating a pattern of patches with controlled dimensions and added functionalities. Patterned composites reveal features which are not typical for conventional composites such as fibre bridged interfaces, regular thickness variation, and gradient matrix properties. The presented study explores the ro…

Textile reinforcementA. Multifunctional compositesMaterials sciencetechnology industry and agricultureElectrically conductiveE. 3-D printingLiquid resin02 engineering and technologyBristol Composites Institute ACCIS010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesA. Carbon nanotubes and nanofibers0104 chemical sciencesMechanics of MaterialsCeramics and CompositesSurface modificationTextile compositeComposite materialB. Electrical properties0210 nano-technology/dk/atira/pure/core/keywords/composites_SRIElectrical conductorCuring (chemistry)
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