0000000000265011
AUTHOR
Dintcheva
Photo- and thermo- oxidative stabilization of polymer-based nanocomposites through the incorporation of CNTs with in-built antioxidant activity
Antioxidant molecules are physically immobilized onto multi-walled carbon nanotubes (CNTs) surface and the resulting hybrid-nanoparticles are used to prepare Ultra High Molecular Weight PolyEthylene-based nanocomposite with enhanced photo- and thermo- oxidation resistance. Natural phenols derivatives, such as quercetin and α-tocopherol, are known to be an excellent antioxidant for polyethylene, but when they are physically immobilized on CNTs the stabilizing activity strongly increase. This is due to a synergic effect stemming from the physical interaction between the antioxidants and CNTs, which cannot provide a similar stabilizing action if used separately. In particular, it is proposed t…
Hybrid ionogels as potential antioxidant agents
In the present study, the influence of CNTs on the gelling ability of some carboxylate imidazolium gelators in ionic liquid solutions has been investigated.
Natural Anti-oxidants for Bio-polymeric Materials
In this work, three different bio-polymers, i.e. a commercial starch-based polymer (Mater-Bi®) a bio-polyester (PLA), and a bio-polyether (PEO) were additivated with quercetin, a natural flavonoid antioxidants, in order to formulate biobased films for eco-sustainable packaging and outdoor applications. The photo-oxidation behavior of unstabilized and quercetin stabilized films has been evaluated and compared with that of films additivated with a commercial synthetic light stabilizer. Obtained results show that quercetin molecules are able to slow down the photodegradation rate of all investigated bio-polymeric films, opening new avenues in the formulation of fully renewable polymer-based sy…
Tunable radical scavenging activity of carbonaceous structures and their anti-oxidant behaviour in polymer based nanocomposites
Introduction: Carbon nanotubes (CNTs), due to their electronic properties, show radical scavenging activity toward the radical formed during the degradation processes of polymeric materials. In this work, we propose a novel strategy to control the CNTs anti-oxidant features through the application of an ultrasound treatment (us). Materials and Methods: Ultra high molecular weight polyethylene (UHMWPE); multi-walled carbon nanotubes (CNTs); CNTs have been sonicated at room temperature for different time intervals. Nanocomposites have been prepared though hot compaction and fully characterized. Results: The content of CNTs structural defects, evaluated through Raman-spectroscopy, increases wi…