Nanohybrid (phPOSS-f-CNTs) based on Carbon Nanotubes (CNTs) and Phenyl Polyhedral Olygomenric Silsesquioxane (phPOSS) have been synthesized to be used as multifunctional filler for polymer nanocomposites. The success of the functionalization procedure has been demonstrated via accurate spectroscopic, spectrometric and thermo-gravimetric analyses. The results reveal that a large portion of phPOSS is covalently linked to CNTs, while a small amount of phPOSS remains physically adsorbed due to the strong interactions coming from π electron coupling between the CNTs and phenyl rings in phPOSS. Small amounts (1 wt.%) of phPOSS-f-CNTs have been dispersed in Ultra High Molecular Weight Polyethylene (UHMWPE), aiming at improving the photo-stability of the resulting nanocomposite. The rheological and thermo-mechanical behaviour of UHMWPE/phPOSS-f-CNTs nanocomposite reflects two different opposite contributions:, namely the reinforcement effect of CNTs and the plasticizing action of phPOSS molecules. Concerning the photo-oxidative behaviour, phPOSS-f-CNTs show a remarkable protective ability, which is absolutely much higher than those exerted by CNTs and phPOSS molecules when added one by one. Such unexpected results could be explained considering (i) a synergic effect between phPOSS and CNTs, (ii) the possibility of phPOSS to act at the polymer-nanoparticles interface, which is a critical region for the degradation processes, and (iii) the formation of a phPOSS-rich layer that may hinder the oxygen diffusion within the polymeric matrix.

Multi-functional Polyhedral Oligomeric Silsesquioxane-functionalized Carbon Nanotubes for photo-oxidative stable Ultra-High Molecular Weight Polyethylene-based Nanocomposites / Dintchevaa, Nadka Tzankova; Arrigo, Rossella; Carroccio, Sabrina; Curcuruto, Giuseppina; Guenzi, Monica; Gambarotti, Cristian; Filippone, Giovanni. - In: EUROPEAN POLYMER JOURNAL. - ISSN 0014-3057. - (2016). [10.1016/j.eurpolymj.2016.01.002]

Multi-functional Polyhedral Oligomeric Silsesquioxane-functionalized Carbon Nanotubes for photo-oxidative stable Ultra-High Molecular Weight Polyethylene-based Nanocomposites

FILIPPONE, GIOVANNI
2016

Abstract

Nanohybrid (phPOSS-f-CNTs) based on Carbon Nanotubes (CNTs) and Phenyl Polyhedral Olygomenric Silsesquioxane (phPOSS) have been synthesized to be used as multifunctional filler for polymer nanocomposites. The success of the functionalization procedure has been demonstrated via accurate spectroscopic, spectrometric and thermo-gravimetric analyses. The results reveal that a large portion of phPOSS is covalently linked to CNTs, while a small amount of phPOSS remains physically adsorbed due to the strong interactions coming from π electron coupling between the CNTs and phenyl rings in phPOSS. Small amounts (1 wt.%) of phPOSS-f-CNTs have been dispersed in Ultra High Molecular Weight Polyethylene (UHMWPE), aiming at improving the photo-stability of the resulting nanocomposite. The rheological and thermo-mechanical behaviour of UHMWPE/phPOSS-f-CNTs nanocomposite reflects two different opposite contributions:, namely the reinforcement effect of CNTs and the plasticizing action of phPOSS molecules. Concerning the photo-oxidative behaviour, phPOSS-f-CNTs show a remarkable protective ability, which is absolutely much higher than those exerted by CNTs and phPOSS molecules when added one by one. Such unexpected results could be explained considering (i) a synergic effect between phPOSS and CNTs, (ii) the possibility of phPOSS to act at the polymer-nanoparticles interface, which is a critical region for the degradation processes, and (iii) the formation of a phPOSS-rich layer that may hinder the oxygen diffusion within the polymeric matrix.
2016
Multi-functional Polyhedral Oligomeric Silsesquioxane-functionalized Carbon Nanotubes for photo-oxidative stable Ultra-High Molecular Weight Polyethylene-based Nanocomposites / Dintchevaa, Nadka Tzankova; Arrigo, Rossella; Carroccio, Sabrina; Curcuruto, Giuseppina; Guenzi, Monica; Gambarotti, Cristian; Filippone, Giovanni. - In: EUROPEAN POLYMER JOURNAL. - ISSN 0014-3057. - (2016). [10.1016/j.eurpolymj.2016.01.002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/621762
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