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Alessandria, Italy

Monti M.,PROPLAST Consortium | Camino G.,PROPLAST Consortium | Camino G.,Polytechnic University of Turin
Polymer Degradation and Stability | Year: 2013

In this paper, we report a thorough study on the thermal stability and fire behavior of polyethersulfone (PES) filled with 2 wt% nano-sized aluminum oxide hydroxide particles (boehmite). The nanocomposite was prepared through melt compounding technique in a co-rotating twin screw extruder. The obtained morphology of the composite was studied by scanning electron microscopy (SEM) coupled with elemental analysis, proving that an even distribution of sub-micron boehmite particles was obtained. PES shear modulus, measured by DMA, is increased by 30% in the boehmite nanocomposite. Thermal stability of the produced materials was studied through thermal gravimetric analysis (TGA), whereas the combustion behavior through cone calorimeter and vertical burning (UL-94) tests. Cone calorimeter results show that a significant overall flame retardant effect was observed due to the presence of boehmite nanoparticles, which could not be detected by UL-94 fire scenario where neat PES is already top ranked V0. © 2013 Elsevier Ltd. All rights reserved. Source


Monti M.,PROPLAST Consortium | Hoydonckx H.,TransFurans Chemicals | Stappers F.,TransFurans Chemicals | Camino G.,PROPLAST Consortium | Camino G.,Polytechnic University of Turin
European Polymer Journal | Year: 2015

Abstract In this paper, we report the development of furan resin nanocomposites, filled with silica nanoparticles. In order to have a dispersion procedure, which could be easily up-scalable to the industrial level, a commercially available water-based suspension of silica particles was used. This was possible thanks to the fact that water is a good solvent of furan resin. Different treatments with silanes were performed in order to improve the interaction between the silica particles and the furan matrix. As a result, the thermal oxidative resistance of the furan resin is improved with also a minor improvement of fire reaction, which is already quite substantial in the pristine resin. © 2015 Elsevier Ltd. Source


Fukushima K.,Polytechnic University of Turin | Tabuani D.,PROPLAST Consortium | Abbate C.,University of Catania | Arena M.,University of Catania | Ferreri L.,CNR Institute of Chemistry and Technology of Polymers
Polymer Degradation and Stability | Year: 2010

PLA and PCL nanocomposites prepared by adding 5 wt% of a sepiolite (SEPS9) were degraded in compost, leading to effective degradation for all samples. PLA and PLA/SEPS9 seem to be mainly degraded by a bulk mechanism, showing a significant level of polymer degradation, however the presence of SEPS9 particles partially delays the degradation probably due to a preventing effect of these particles on polymer chain mobility and/or PLA/enzymes miscibility. PCL and PCL/SEPS9 showed a preferential surface mechanism of degradation; and in contrast to PLA, sepiolite does not present a considerable barrier effect on the degradation of PCL. © 2010 Elsevier Ltd. All rights reserved. Source


Fukushima K.,Polytechnic University of Turin | Tabuani D.,PROPLAST Consortium | Abbate C.,University of Catania | Arena M.,University of Catania | Rizzarelli P.,CNR Institute of Chemistry and Technology of Polymers
European Polymer Journal | Year: 2011

PLA and PCL based nanocomposites prepared by adding three different types of fumed silica were obtained by melt blending. Materials were characterized by means of Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA) and Dynamic-Mechanical Thermal Analysis (DMTA). A good distribution of the fumed silica into both polymer matrices was observed. The highest thermo-mechanical improvements were reached by addition of the fumed silica with higher surface area. PLA and its nanocomposites were degraded in compost at 58 °C; at this temperature all samples presented a significant level of polymer degradation, but a certain protection action of silica towards PLA degradation was observed, whereas the addition of fumed silica did not show considerable influence on the degradation trend of PCL. These dissimilarities were attributed to the different degradation mechanism of the two polymers. © 2010 Elsevier Ltd. All rights reserved. Source


Laik S.,University of Lyon | Laik S.,CNRS Laboratory for Polymer Materials Engineering | Galy J.,University of Lyon | Galy J.,CNRS Laboratory for Polymer Materials Engineering | And 5 more authors.
Polymer Degradation and Stability | Year: 2015

The present work is about the investigation of the fire behavior of epoxy networks designed for structural composite materials used in aeronautics. Two high-Tg, infusion-suitable epoxy systems were studied. A model system was based on tetraglycidyl(diaminodiphenyl)methane (TGDDM) as an epoxy prepolymer, and 4,4' methylene bis(2,6-diethylaniline) (MDEA) as a curing agent. A second system was based on a commercial aeronautic formulation specially designed for the infusion process. The triSilanolPhenyl POSS (POSSOH) was chosen as an additive due to the presence of phenyl groups and silanol functions that could possibly react with the network compounds. In this perspective, an aluminium salt (aluminium tri(acetylacetonate)) was introduced in presence of POSSOH in order to enhance the reaction of the additive with the epoxy monomer. The study of the morphology revealed intricate structures, with an overall good dispersion of the POSSOH in the epoxy networks. In terms of fire behaviour, same tendencies were observed for both epoxy networks, i.e. the combined presence of POSSOH and the aluminium-based additive brought significant improvements with a substantial and effective intumescent-like behaviour. © 2015 Elsevier Ltd. Source

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