Search results for " MATERIALI"
showing 10 items of 710 documents
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…
On The Use Of Polyolefins Based Nanocomposites For Film Blowing Applications
2010
Improvement of the photo-stability of nanocomposite based LDPE/EVA films
2008
Influence of the matrix on photo-oxidative degradation of polyolefin based nanocomposite films
2008
SVILUPPO DI MATERIALI INNOVATIVI NANOSTRUTTURATI A BASE DI BIOPOLIMERI PER APPLICAZIONI IN IMBALLAGGI
I materiali nanocompositi hanno attirato l’interesse della comunità scientifica e industriale degli ultimi decenni grazie alle proprietà straordinarie che la matrice polimerica acquista semplicemente a seguito dell’incorporazione di una carica nanostrutturata al suo interno. Le nanotecnologie sono così attraenti perché mediante l’aggiunta di solo poche percentuali in peso di una carica nanostrutturata, consentono di utilizzare le classiche tecniche di lavorazione dei polimeri tradizionali e di conseguenza permettono la preparazione di materiali innovativi a costi contenuti. Poiché oltre al potenziamento delle proprietà iniziali i materiali nanostrutturati possono anche acquisirne di nuove, …
Mechanical response of PLA-based biocomposites under creep conditions
2017
Over the last decades, polymer composites containing natural fibers are receiving growing attention both from academia and the industry, as possible alternatives of composites containing synthetic fibers [1]. Moreover, in order to reduce the environmental impacts related to the use of oil-derived polymer matrices, biodegradable ones obtained from renewable sources such as poly(lactic acid) (PLA) have been considered [2]. Several papers are available regarding the mechanical behavior of natural fibers reinforced PLA composites, but only few deal with their creep behavior [3]. In the present work, the tensile creep behaviour of PLA based composites, containing flax and jute plain weave woven …