1,720,981 research outputs found
MULTIFUNCTIONAL SELF-HEALING COMPOSITE MATERIAL FOR AERONAUTICS APPLICATIONS
No full textThe multifunctional composite material comprises a polymeric matrix filled with electrically conductive nanoparticles combined with a self-healing molecular filler selected in the group consisting of molecules and oligomers containing groups acting as donors and acceptors of hydrogen bonds
MULTIFUNCTIONAL SELF-HEALING COMPOSITE MATERIAL FOR AERONAUTICS APPLICATIONS
No full textThe multifunctional composite material comprises a polymeric matrix filled with electrically conductive nanoparticles combined with a self-healing molecular filler selected in the group consisting of molecules and oligomers containing groups acting as donors and acceptors of hydrogen bonds
Method of monitoring a composite material
No full textThe method allows to monitor a composite material comprising an epoxy resin filled with electrically conductive nanoparticles, wherein at least one electrical property i.e. impedance of the composite material is influenced by being subjected to a mechanical deformation. The method provides for inserting the composite material in an electric circuit emitting an electric signal whose value depends on the electrical property, so that, when the value of the signal overcomes a given threshold value, a warning message is delivered
Self-sensing nanocomposites in automotive/aeronautic field
No full textCarbon Nanotubes have been incorporated in a resin-based on the bi-functional epoxy precursor diglycidyl ether of bisphenol A (DGEBA). Electrical measurements allowed evaluating the electric percolation curve with a value of electric percolation threshold detected around 0.015% by weight of multi-wall carbon nanotubes (MWCNTs). It has been found, by electro-mechanical tests, that the Gauge Factor (G.F.) decreases with increasing the carbon nanotubes percentage. Furthermore, the presence of a residual resistivity allows diagnosing permanent damage in the epoxy matrix. High piezoresistive performance (G.F. = 4.7) of the Carbon Fiber Reinforced Panels (CFRP) coated with the epoxy resin containing 0.1 wt% of MWCNT, has been obtained
Multifunctional epoxy resin with enhanced flame resistance
No full textThe epoxy resin has a limiting oxygen index (LOI) measured according to standard ASTM 2863, which is at least 28%, if the resin comprises at least a silsesquioxane compound (POSS), or at least 36%, if the resin is obtainable by curing an epoxy precursor formulation with an hardening agent which is an aromatic organo-phosphorous compound, preferably an organophosphine oxide of general formula R 3 PO, wherein at least two R moieties are amino-phenyl and one R moiety is alkyl, phenyl or amino-phenyl, wherein each phenyl ring may have independently one or more electrophile substituents
Epoxy resin based composition and method for the curing thereof.
No full textThe composition comprises at least one epoxy resin, carbon nanotubes in a quantity of between 0.1 and 10 parts by weight per 100 parts of epoxy resin and at least one curing agent of the epoxy resin in a quantity of between 5 and 50 parts by weight per 100 parts of epoxy resin. The method of curing said composition comprises the phases of mixing the above-stated ingredients, and of heating the resultant mixture to a temperature of between 100 and 250°C
GRUBBS-HOVEYDA TYPE CATALYST FOR METATHESIS REACTIONS IN HIGHLY REACTIVE ENVIRONMENTS
No full textThe present invention relates to catalysts which must be stable in an interactive environment, such as an epoxy mixture hardened at high temperature and/or with hardeners such as aromatic primary amines, in particular catalysts for self-healing resins comprising of vessels containing healing agents
Effect of carbon nanotube and functionalized liquid rubber on mechanical and electrical properties of epoxy adhesives for aircraft structures
No full textNew electrical conductive adhesives based on Multi Wall Carbon Nanotubes (MWCNTs) and functionalized liquid rubber have been designed and characterized. The elastomeric domains play a very relevant role in enhancing flexibility and mechanical performance of the adhesive formulation. Lap shear adhesion tests have shown enhancements in the stress up to 69% for the sample containing 25 phr of elastomeric phase in the matrix. The inclusion of MWCNTs in the toughened adhesive can be advantageously employed for further enhancing adhesive properties simultaneously imparting electrical conductivity, which results of 11 orders of magnitude higher than the unfilled formulation
Procedimento di monitoraggio della reazione di curing di una matrice polimerica di un materiale composito.
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