6533b7d8fe1ef96bd126af9e
RESEARCH PRODUCT
Water diffusion and swelling stresses in highly crosslinked epoxy matrices
Andrea ToscanoGiuseppe SpadaroGiuseppe PitarresiMichele ScafidiMaria Di FilippoSabina Alessisubject
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)description
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 conditioning, has allowed to characterise the modifications occurring in the network structures during aging. Photoelastic Stress Analysis is adopted to monitor the evolution of stresses on rectangular beam samples during absorption and desorption of water. Correlation of water uptake, dynamic mechanical behaviour and transitory stress fields, has allowed to make some assumptions about the influence of the epoxy network on the swelling behaviour.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-09-07 |