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Hierarchical assembly of hard/soft nanoparticles holds great potential as reinforcements for polymer nanocomposites with tailored properties. Here, we present a facile strategy to integrate polystyrene-grafted carbon nanotubes (PSgCNT) (0.05-0.3 wt %) and poly(styrene-b- [isoprene-ran-epoxyisoprene]-b-styrene) block copolymer (10 wt %) into epoxy coatings using an ultrasound-assisted noncovalent functionalization process. The method leads to cured nanocomposites with core-shell block copolymer (BCP) nanodomains which are associated with carbon nanotubes (CNT) giving rise to CNT-BCP hybrid structures. Nanocomposite energy dissipation and reduced Young's Modulus (E∗) is determined from force-distance curves by atomic force microscopy operating in the PeakForce QNM imaging mode and compared to thermosets modified with BCP and purified carbon nanotubes (pCNT). Remarkably, nanocomposites bearing PSgCNT-BCP conjugates display an increase in energy dissipation of up to 7.1-fold with respect to neat epoxy and 53% more than materials prepared with pCNT and BCP at the same CNT load (0.3 wt %), while reduced Young's Modulus shows no significant change with CNT type and increases up to 25% compared to neat epoxy E∗ at a CNT load of 0.3 wt %. The energy dissipation performance of nanocomposites is also reflected by the lower wear coefficients of materials with PSgCNT and BCP compared to those with pCNT and BCP, as determined by abrasion tests. Furthermore, scanning electron microscopy (SEM) images taken on wear surfaces show that materials incorporating PSgCNT and BCP exhibit much more surface deformation under shear forces in agreement with their higher ability to dissipate more energy before particle release. We propose that the synergistic effect observed in energy dissipation arises from hierarchical assembly of PSgCNT and BCP within the epoxy matrix and provides clues that the CNT-BCP interface has a significant role in the mechanisms of energy dissipation of epoxy coating modified by CNT-BCP conjugates. These findings provide a means to design epoxy-based coatings with high-energy dissipation performance. © 2016 American Chemical Society.


Documento: Artículo
Título:High-energy dissipation performance in epoxy coatings by the synergistic effect of carbon nanotube/block copolymer conjugates
Autor:Garate, H.; Bianchi, M.; Pietrasanta, L.I.; Goyanes, S.; D'Accorso, N.B.
Filiación:CIHIDECAR-CONICET, Departamento de Química Orgánica, FCEyN-UBA, Ciudad Universitaria, 1428, Ciudad Autónoma de Buenos Aires, Argentina
Centro de Microscopías Avanzadas, FCEyN-UBA, Ciudad Universitaria, 1428, Ciudad Autónoma de Buenos Aires, Argentina
LPandMC, Ciudad Universitaria, 1428, Ciudad Autónoma de Buenos Aires, Argentina
IFIBA-CONICET, Departamento de Física, FCEyN-UBA, Ciudad Universitaria, 1428, Ciudad Autónoma de Buenos Aires, Argentina
LIONS, NIMBE, CEA, CNRS, Universiteé Paris-Saclay, CEA-Saclay, Cedex Gif-sur-Yvette, 91191, France
Palabras clave:Block copolymer (BCP); Carbon nanotubes (CNT); Energy dissipation; Epoxy coatings; Nanocomposites; Wear resistance; Atomic force microscopy; Block copolymers; Coatings; Elastic moduli; Energy dissipation; Epoxy resins; Nanocomposites; Nanotubes; Plastic coatings; Scanning electron microscopy; Styrene; Wear resistance; Yarn; Epoxy coatings; Force-distance curves; Hierarchical assemblies; Non-covalent functionalization; Polymer nanocomposite; Scanning electron microscopy image; Surface deformation; Tailored properties; Carbon nanotubes
Página de inicio:930
Página de fin:943
Título revista:ACS Applied Materials and Interfaces
Título revista abreviado:ACS Appl. Mater. Interfaces


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---------- APA ----------
Garate, H., Bianchi, M., Pietrasanta, L.I., Goyanes, S. & D'Accorso, N.B. (2017) . High-energy dissipation performance in epoxy coatings by the synergistic effect of carbon nanotube/block copolymer conjugates. ACS Applied Materials and Interfaces, 9(1), 930-943.
---------- CHICAGO ----------
Garate, H., Bianchi, M., Pietrasanta, L.I., Goyanes, S., D'Accorso, N.B. "High-energy dissipation performance in epoxy coatings by the synergistic effect of carbon nanotube/block copolymer conjugates" . ACS Applied Materials and Interfaces 9, no. 1 (2017) : 930-943.
---------- MLA ----------
Garate, H., Bianchi, M., Pietrasanta, L.I., Goyanes, S., D'Accorso, N.B. "High-energy dissipation performance in epoxy coatings by the synergistic effect of carbon nanotube/block copolymer conjugates" . ACS Applied Materials and Interfaces, vol. 9, no. 1, 2017, pp. 930-943.
---------- VANCOUVER ----------
Garate, H., Bianchi, M., Pietrasanta, L.I., Goyanes, S., D'Accorso, N.B. High-energy dissipation performance in epoxy coatings by the synergistic effect of carbon nanotube/block copolymer conjugates. ACS Appl. Mater. Interfaces. 2017;9(1):930-943.