0000000000290132
AUTHOR
A. Pantano
EFFETTI DI NANOTUBI SULLA RESISTENZA A FATICA DI BIOCOMPOSITI A FIBRE CORTE RANDOM
In order to comply with the recent regulations in terms of environmental protection, biocomposites reinforced with natural fibers are increasingly used in the automotive sector, for the replacement of synthetic materials in semi-structural applications as panels, filling material, coating, dashboards, etc. The good mechanical performances of these materials, mixed with low weight and low cost, also make it possible to minimize the weight of the vehicle, and therefore consumption, but also the relative production costs. These are composites with random short fiber appreciated for their good stiffness, generally well above that of the matrix alone. Due to the peculiar "transverse" damage phen…
Characterization of the dispersion of carbon nanotubes in nanocomposites by means of a non-destructive evaluation technique
An extensive use of CNTs enhanced polymer composites can be boosted by novel NDE techniques able to check the quality of the products made of these nanocomposites in order to guarantee that their specifications are met. It is well known in literature that the parameter that much more than others can affect the enhancing capabilities of the added nanoparticles is their dispersion. All the resulting physical properties of the CNTs based polymer composites depend strongly on level of dispersion of the CNTs throughout the matrix. Here we presented a novel NDE technique based on infrared thermography able to test the dispersion of the added nanoparticles in nanocomposites. Two different procedur…
Tecnica non distruttiva per la valutazione dei livelli di dispersione dei nanotubi di carbonio nei compositi a matrice polimerica
È noto in letteratura che il parametro che molto più di altri può influenzare il potenziale incremento delle proprietà dei compositi a matrice polimerica dovuto alla presenza dei CNTs è la dispersione. Tutte le proprietà fisiche dei compositi polimerici a base di CNTs dipendono fortemente dal loro livello di dispersione nella matrice: una distribuzione omogenea ottimizza le prestazioni, mentre la formazione di aggregati e una scarsa dispersione determinano miglioramenti limitati delle proprietà della matrice. In questo lavoro viene presentata una nuova tecnica di valutazione non distruttiva (NDE) basata sulla termografia a infrarossi in grado di valutare il livello di dispersione dei CNTs n…
MIGLIORAMENTO DELLE PRESTAZIONI MECCANICHE DI BIOCOMPOSITI RINFORZATI CON FIBRE DI AGAVE MEDIANTE BASSE CONCENTRAZIONI DI BIOCHAR
Biocarbon is finding increasing applications in polymer composites, thanks to its reinforcing action and increased electrical and thermal properties. In this study it was added as a filler in a biocomposite reinforced with natural fibers to investigate its effect on static resistance and fatigue lifetime. Biocomposites are increasingly used in the industry for the replacement of synthetic materials, thanks to their good mechanical properties. Unfortunately, in several potential fields of application the static strength and the fatigue life of these materials are not high enough. For this reason, several chemical treatments on the fibers have been proposed, although still without fully satis…