Search results for " Dynamic Mechanical Thermal Analysis."

showing 3 items of 3 documents

Water diffusion and swelling stresses in highly crosslinked epoxy matrices

2016

Abstract The present work investigates the swelling induced stresses arising in two epoxy systems during water uptake. The analysed systems are two epoxy resin based on DGEBA monomer and DGEBF monomer respectively, both fully cured by DDS amine. The systems achieve different cross-link density degrees, and are characterised by high glass transition temperatures ranging between 200 and 230 °C. Both epoxies have been conditioned in deionized water baths at two different temperatures (50 °C and 80 °C). A desorption process at room temperature in a dry airborne environment was performed after saturation. Dynamic Mechanical Thermal Analysis, carried out at the various stages of hydrothermal cond…

Materials scienceEpoxy Resin; Hydrothermal Aging; Swelling; Dynamic Mechanical Thermal Analysis; Photoelastic Stress AnalysisPolymers and PlasticsDynamic Mechanical Thermal Analysi02 engineering and technology010402 general chemistry01 natural sciencesPhotoelastic Stress AnalysisStress (mechanics)DesorptionMaterials ChemistrymedicineHydrothermal AgingComposite materialThermal analysisSwellingEpoxy021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesMechanics of MaterialsEpoxy Resinvisual_artvisual_art.visual_art_mediumSettore CHIM/07 - Fondamenti Chimici Delle TecnologieSwellingmedicine.symptomAbsorption (chemistry)0210 nano-technologyGlass transitionSaturation (chemistry)
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A green method to prepare nanosilica modified graphene oxide to inhibit nanoparticles re-aggregation during melt processing

2017

Abstract A graphene oxide-silica nanohybrid (GOS), self-assembled into a lasagna -like structure, was prepared in water and used as a filler for the melt preparation of polyamide 6 (PA6)-based nanocomposites. For sake of comparison, PA6-based materials were prepared under the same processing conditions by adding GO only or a physical mixture of GO and silica (GO+S). All the materials were characterized from a morphological, spectroscopic, thermal, dynamic-mechanical (DMA) and mechanical point of view. For all the nanocomposites, the interphase was studied either by analyzing loss factor plots coming from DMA measurements and by implementing a novel approach, i.e. combining solvent extractio…

Materials scienceGeneral Chemical EngineeringOxideNanoparticle02 engineering and technologyGraphene-ceramics010402 general chemistry01 natural sciencesIndustrial and Manufacturing Engineeringlaw.inventionchemistry.chemical_compoundlawEnvironmental ChemistryInterphasechemistry.chemical_classificationGreen processing; SEM; Dynamic mechanical thermal analysis (DMTA); Mechanical properties; Interphase; Graphene-ceramicsDynamic mechanical thermal analysis (DMTA)NanocompositeGrapheneGeneral ChemistryPolymer021001 nanoscience & nanotechnology0104 chemical sciencesChemical engineeringchemistrySEMPolyamide0210 nano-technologyDispersion (chemistry)Ternary operationMechanical propertieGreen processingChemical Engineering Journal
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Mode I fracture toughness behaviour of epoxy resincarbon fiber composites cured by ionising radiation

2012

In this work Mode I fracture toughness behavior of Electron Beam cured unidirectional CFRP laminates is investigated by means of standardized Double Cantilever Beam (DCB) tests. A matrix system, comprising a DGEBA epoxy monomer and a typical initiator of cationic polymerization, was used and panel samples assembled by hand lay-up. Curing was achieved by 20 to 40 minutes irradiation on a pulsed 10 MeV Electron Beam accelerator. One batch of resin was also mixed with 10 phr of a PES thermoplastic monomer in order to enhance the matrix toughness. The influence of fibre-matrix adhesion, matrix toughening and matrix crosslinking density on the mode I delamination behavior have been investigated …

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineSettore CHIM/07 - Fondamenti Chimici Delle TecnologieRadiation Curing CFRP Delamination Fracture Toughness Dynamic Mechanical Thermal Analysis.
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