Search results for "Materiali"
showing 10 items of 876 documents
Degradation od Mater-Bi/wood flour biocomposites in active sewage sludge
2009
NANOCOMPOSITI A BASE POLIMERICA AD ELEVATE PRESTAZIONI: FUNZIONALIZZAZIONE E IMMOBILIZZAZIONE DI NANOSTRUTTURE
2014
Processing and characterization of blends of fluoroelastomers with semirigid liquid crystal polymers
1996
Fluoroelastomers (FEs) usually have working temperatures above 150 degrees C and a great resistance to aggressive agents such as oils, fuels, aliphatic and aromatic solvents, steam, moderate acid, and basic environments. Liquid crystal polymers (LCPs) can be effective processing aids and reinforcing agents for elastomers. These characteristics are very attractive to lower melt viscosity and to stiffen and strengthen the final product through a simple blending. Among the LCPs, the semirigid LCPs seem the most appealing for blending with flexible thermoplastics (FTs) because their processing temperatures can be arranged to be in the same processing temperature range of FTs and because the pre…
INDAGINI SPERIMENTALI SU MALTE TRATTATE CON SILICATO DI LITIO NANODISPERSO DA UTILIZZARE PER STUCCATURE DI MATERIALI LAPIDEI COMPATTI
2018
In questo lavoro di ricerca, sviluppato all’interno della tesi di laurea magistrale in Conservazione e Restauro dei Beni Culturali presso l’accademia Galli di Como con la supervisione della restauratrice Gisella Bianconi, si è sperimentato l’uso del silicato di litio come additivo per il miglioramento delle prestazioni di malte a base di leganti inorganici, e in particolare calci aeree e idrauliche, utilizzate nel restauro dei materiali lapidei. Spesso per le stuccature di materiali lapidei compatti vengono utilizzate malte con leganti organici, ed in particolare di tipo epossidico, che offrono certamente ottime proprietà meccaniche e un’eccellente adesività, garantendo al contempo una acce…
La conservazione di opere policrome in Norvegia e in Italia: confronto e incontro tra la metodologia e la cultura del restauro nei due paesi
2014
IL RESTAURO DELLA STATUA LIGNEA DORATA RAFFIGURANTE SANT’AGATA STUDIO SPERIMENTALE SUI MATERIALI PER L’INTEGRAZIONE DI PARTI LIGNEE MANCANTI
2015
In questo articolo si presenta l’intervento di restauro della statua lignea dorata, raffigurante Sant'Agata e scene di vita della Santa, eseguito nell’ambito di una tesi di laurea in Conservazione e Restauro dei Beni Culturali e la sperimentazione, ad essa collegata, sul comportamento meccanico e la compatibilità con il legno di alcuni materiali per stuccatura e reintegrazione. L'opera originariamente conservata presso il magazzino loggiato della Galleria Interdisciplinare Regionale della Sicilia di Palazzo Abatellis, è stata spostata presso l’oratorio dei Bianchi di Palermo per l’intervento di restauro svoltosi a cantiere aperto, per la prova di laurea magistrale in Conservazione e Restaur…
Opuntia Ficus Indica based green composites for NPK fertilizer controlled release produced by compression molding and fused deposition modeling
2022
Excessive fertilization causes ecological problems due to leaching issues. To solve this problem and promote agriculture sustainability an innovative green composite for controlled release fertilizers was produced by adding NPK fertilizer flour to a biodegradable polymer with or without Opuntia Ficus Indica (OFI) particles. Six for- mulations were produced and employed for the fabrication of devices both for compression molding and fused deposition modeling (FDM). Both fillers displayed a good dispersion in the composites, excellent adhesion with the polymeric matrix and effectively acted as reinforcement. The decrease of NPK release rate (up to 30 days) was achieved using whole composites …
Assessment of performance degradation of hybrid flax-glass fiber reinforced epoxy composites during a salt spray fog/dry aging cycle
2022
The main goal of this paper is the evaluation of the performances reversibility of hybrid composites when they are dried after being aged in salt-fog environment. To this aim, epoxy composites reinforced with flax and glass fabrics respectively in the internal and external laminae were at first exposed to salt-fog (i.e., identified as wet phase) and then stored in controlled conditions (i.e., identified as dry phase). The flexural properties evolution of these composites as well as their water uptake and contact angle were monitored at varying time of both phases. The flexural strength and modulus of hybrid composites is 23.4% (17.9%) and 15.5% (12.9%) lower than unaged ones after 30 (15) d…
NANOCOMPOSITI A BASE POLIMERICA AD ELEVATE PRESTAZIONI:NANOPARTICELLE CON STABILIZZANTI IMMOBILIZZATI IN ORGANO-MODIFICATORI
Effects of Organoclay on Morphology and Properties of Nanocomposites Based on LDPE/PA6 Blends without and with SEBS-g-MA
2009
LDPE/PA-6 blends (75/25 wt/wt) were added with SEBS-g-MA (S) and/or an organoclay (20A) using different compounding sequences and the morphology and the properties of the blends or composites were investigated. An XRD study of the nanocomposites with pure polymers showed that 20A is intercalated by LDPE or PA-6 chains, whereas it is exfoliated by S if the clay concentration does not exceed 10 wt%. The SEM investigation showed that both S and 20A behave as efficient emulsifying agents for the LDPE/PA-6 blends. However, their effect on the mechanical properties was found to be opposite: S enhanced toughness but lowered the stiffness, whereas 20A improved the elastic modulus but impaired the i…