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Article

Tunneling Atomic Force Microscopy Analysis of Supramolecular Self-Responsive Nanocomposites

1
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
2
Macromolecular Chemistry, Institute of Chemistry, Faculty of Natural Science II, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle, Germany
3
Department of Chemistry, University of Petroleum and Energy Studies (UPES), Dehradun 248007, India
*
Author to whom correspondence should be addressed.
Academic Editors: Ilaria Armentano and Chih-Feng Huang
Polymers 2021, 13(9), 1401; https://doi.org/10.3390/polym13091401
Received: 14 March 2021 / Revised: 10 April 2021 / Accepted: 22 April 2021 / Published: 26 April 2021
(This article belongs to the Special Issue Polymeric Self-Healing Materials)
A big step forward for composite application in the sector of structural materials is given by the use of Multi-Wall Carbon Nanotubes (MWCNTs) functionalized with hydrogen bonding moieties, such as barbiturate and thymine, to activate self-healing mechanisms and integrate additional functionalities. These materials with multiple healing properties at the same damaged site, imparted by hydrogen bonds, will also have the potential to improve material reliability, extend the service life, reduce replacement costs, and improve product safety. This revolutionary approach is obtained by integrating the non-covalent interactions coupled with the conventional covalent approach used to cross-link the polymer. The objective of this work is to characterize rubber-toughened supramolecular self-healing epoxy formulations based on unfunctionalized and functionalized MWCNTs using Tunneling Atomic Force Microscopy (TUNA). This advanced technique clearly shows the effect produced by the hydrogen bonding moieties acting as reversible healing elements by their simultaneous donor and acceptor character, and covalently linked to MWCNTs to originate self-healing nanocomposites. In particular, TUNA proved to be very effective for the morphology study of both the unfunctionalized and functionalized carbon nanotube-based conductive networks, thus providing useful insights aimed at understanding the influence of the intrinsic nature of the nanocharge on the final properties of the multifunctional composites. View Full-Text
Keywords: tunneling atomic force microscopy (TUNA); morphological analysis; self-responsive materials; self-healing nanocomposites; supramolecular interactions; multi-wall carbon nanotubes (MWCNTs); hydrogen bonding; functionalized nanofillers tunneling atomic force microscopy (TUNA); morphological analysis; self-responsive materials; self-healing nanocomposites; supramolecular interactions; multi-wall carbon nanotubes (MWCNTs); hydrogen bonding; functionalized nanofillers
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MDPI and ACS Style

Raimondo, M.; Calabrese, E.; Binder, W.H.; Michael, P.; Rana, S.; Guadagno, L. Tunneling Atomic Force Microscopy Analysis of Supramolecular Self-Responsive Nanocomposites. Polymers 2021, 13, 1401. https://doi.org/10.3390/polym13091401

AMA Style

Raimondo M, Calabrese E, Binder WH, Michael P, Rana S, Guadagno L. Tunneling Atomic Force Microscopy Analysis of Supramolecular Self-Responsive Nanocomposites. Polymers. 2021; 13(9):1401. https://doi.org/10.3390/polym13091401

Chicago/Turabian Style

Raimondo, Marialuigia, Elisa Calabrese, Wolfgang H. Binder, Philipp Michael, Sravendra Rana, and Liberata Guadagno. 2021. "Tunneling Atomic Force Microscopy Analysis of Supramolecular Self-Responsive Nanocomposites" Polymers 13, no. 9: 1401. https://doi.org/10.3390/polym13091401

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